8:01 p.m.
Addressed comment from v8 -> v7
Martin:
* Patch subject prefix.
* Move some of cpu related information to virhostcpu.c.
* Fix some memory leak in src/utils/resctrl.c
Martin & Marcelo:
* Don't remove directories which are not maintained by libvirt.
Addressed comment from v7 -> v6
Marcelo:
* Fix flock usage while VM initialization.
Addressed comment from v6 -> v5
Marcelo:
* Support other APPs to operate /sys/fs/resctrl at same time
Libvirt will scan /sys/fs/resctrl again before doing cache allocation.
patch 10 will address this.
Addressed comment from v4 -> v5:
Marcelo:
* Several typos
* Use flock instead of virFileLock
Addressed comment from v3 -> v4:
Daniel & Marcelo:
* Added concurrence support
Addressed comment from v2 -> v3:
Daniel:
* Fixed coding style, passed `make check` and `make syntax-check`
* Variables renaming and move from header file to c file.
* For locking/mutex support, no progress.
There are some discussion from mailing list, but I can not find a better
way to add locking support without performance impact.
I'll explain the process and please help to advice what shoud we do.
VM create:
1) Get the cache left value on each bank of the host. This should be
shared amount all VMs.
2) Calculate the schemata on the bank based on all created resctrl
domain's schemata
3) Calculate the default schemata by scaning all domain's schemata.
4) Flush default schemata to /sys/fs/resctrl/schemata
VM destroy:
1) Remove the resctrl domain of that VM
2) Recalculate default schemata
3) Flush default schemata to /sys/fs/resctrl/schemata
The key point is that all VMs shares /sys/fs/resctrl/schemata, and
when a VM create a resctrl domain, the schemata of that VM depends on
the default schemata and all other exsited schematas. So a global
mutex is reqired.
Before calculate a schemata or update default schemata, libvirt
should gain this global mutex.
I will try to think more about how to support this gracefully in next
patch set.
Marcelo:
* Added vcpu support for cachetune, this will allow user to define which
vcpu using which cache allocation bank.
<cachetune id='0' host_id=0 size='3072' unit='KiB'
vcpus='0,1'/>
vcpus is a cpumap, the vcpu pids will be added to tasks file
* Added cdp compatible, user can specify l3 cache even host enable cdp.
See patch 8.
On a cdp enabled host, specify l3code/l3data by
<cachetune id='0' host_id='0' type='l3'
size='3072' unit='KiB'/>
This will create a schemata like:
L3data:0=0xff00;...
L3code:0=0xff00;...
* Would you please help to test if the functions work.
Martin:
* Xml test case, I have no time to work on this yet, would you please
show me an example, would like to amend it later.
This series patches are for supportting CAT featues, which also
called cache tune in libvirt.
First to expose cache information which could be tuned in capabilites XML.
Then add new domain xml element support to add cacahe bank which will apply
on this libvirt domain.
This series patches add a util file `resctrl.c/h`, an interface to talk with
linux kernel's system fs.
There are still one TODO left:
1. Expose a new public interface to get free cache information.
2. Expose a new public interface to set cachetune lively.
Some discussion about this feature support can be found from:
https://www.redhat.com/archives/libvir-list/2017-January/msg00644.html
Eli Qiao (10):
Resctrl: Add some utils functions
Resctrl: expose cache information to capabilities
Resctrl: Add new xml element to support cache tune
Resctrl: Add private interfaces to operate cache bank
Qemu: Set cache tune while booting a new domain.
Resctrl: enable l3code/l3data
Resctrl: Make sure l3data/l3code are pairs
Resctrl: Compatible mode for cdp enabled
Resctrl: concurrence support
Resctrl: Scan resctrl before doing cache allocation
docs/schemas/domaincommon.rng | 46 ++
include/libvirt/virterror.h | 1 +
po/POTFILES.in | 1 +
src/Makefile.am | 1 +
src/conf/capabilities.c | 56 +++
src/conf/capabilities.h | 23 +
src/conf/domain_conf.c | 182 ++++++++
src/conf/domain_conf.h | 19 +
src/libvirt_private.syms | 11 +
src/nodeinfo.c | 64 +++
src/nodeinfo.h | 1 +
src/qemu/qemu_capabilities.c | 8 +
src/qemu/qemu_driver.c | 6 +
src/qemu/qemu_process.c | 54 +++
src/util/virerror.c | 1 +
src/util/virhostcpu.c | 186 +++++++-
src/util/virhostcpu.h | 6 +
src/util/virresctrl.c | 1027 +++++++++++++++++++++++++++++++++++++++++
src/util/virresctrl.h | 88 ++++
19 files changed, 1764 insertions(+), 17 deletions(-)
create mode 100644 src/util/virresctrl.c
create mode 100644 src/util/virresctrl.h
--
1.9.1
8:01 p.m.
New subject: [libvirt] [PATH v8 01/10] Resctrl: Add some utils functions
This patch adds some utils struct and functions to expose resctrl
information.
virResCtrlAvailable: if resctrl interface exist on host.
virResCtrlGet: get specific type resource control information.
virResCtrlInit: initialize resctrl struct from the host's sys fs.
resctrlall[]: an array to maintain resource control information.
Some of host cpu related information methods was added in virhostcpu.c
Signed-off-by: Eli Qiao <liyong.qiao(a)intel.com>
---
include/libvirt/virterror.h | 1 +
po/POTFILES.in | 1 +
src/Makefile.am | 1 +
src/libvirt_private.syms | 4 +
src/util/virerror.c | 1 +
src/util/virhostcpu.c | 186 ++++++++++++++++++++++++++++++++++++----
src/util/virhostcpu.h | 6 ++
src/util/virresctrl.c | 202 ++++++++++++++++++++++++++++++++++++++++++++
src/util/virresctrl.h | 78 +++++++++++++++++
9 files changed, 463 insertions(+), 17 deletions(-)
create mode 100644 src/util/virresctrl.c
create mode 100644 src/util/virresctrl.h
diff --git a/include/libvirt/virterror.h b/include/libvirt/virterror.h
index 2efee8f..3dd2d08 100644
--- a/include/libvirt/virterror.h
+++ b/include/libvirt/virterror.h
@@ -132,6 +132,7 @@ typedef enum {
VIR_FROM_PERF = 65, /* Error from perf */
VIR_FROM_LIBSSH = 66, /* Error from libssh connection transport */
+ VIR_FROM_RESCTRL = 67, /* Error from resource control */
# ifdef VIR_ENUM_SENTINELS
VIR_ERR_DOMAIN_LAST
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 365ea66..f7fda98 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -240,6 +240,7 @@ src/util/virportallocator.c
src/util/virprocess.c
src/util/virqemu.c
src/util/virrandom.c
+src/util/virresctrl.c
src/util/virrotatingfile.c
src/util/virscsi.c
src/util/virscsivhost.c
diff --git a/src/Makefile.am b/src/Makefile.am
index 2f32d41..b626f29 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -162,6 +162,7 @@ UTIL_SOURCES = \
util/virprocess.c util/virprocess.h \
util/virqemu.c util/virqemu.h \
util/virrandom.h util/virrandom.c \
+ util/virresctrl.h util/virresctrl.c \
util/virrotatingfile.h util/virrotatingfile.c \
util/virscsi.c util/virscsi.h \
util/virscsivhost.c util/virscsivhost.h \
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 8e994c7..743e5ac 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2313,6 +2313,10 @@ virRandomGenerateWWN;
virRandomInt;
+# util/virresctrl.h
+virResCtrlAvailable;
+virResCtrlInit;
+
# util/virrotatingfile.h
virRotatingFileReaderConsume;
virRotatingFileReaderFree;
diff --git a/src/util/virerror.c b/src/util/virerror.c
index ef17fb5..0ba15e6 100644
--- a/src/util/virerror.c
+++ b/src/util/virerror.c
@@ -139,6 +139,7 @@ VIR_ENUM_IMPL(virErrorDomain, VIR_ERR_DOMAIN_LAST,
"Perf", /* 65 */
"Libssh transport layer",
+ "Resouce Control",
)
diff --git a/src/util/virhostcpu.c b/src/util/virhostcpu.c
index f29f312..e6d5102 100644
--- a/src/util/virhostcpu.c
+++ b/src/util/virhostcpu.c
@@ -206,29 +206,21 @@ void virHostCPUSetSysFSSystemPathLinux(const char *path)
sysfs_system_path = SYSFS_SYSTEM_PATH;
}
-/* Return the positive decimal contents of the given
- * DIR/cpu%u/FILE, or -1 on error. If DEFAULT_VALUE is non-negative
- * and the file could not be found, return that instead of an error;
- * this is useful for machines that cannot hot-unplug cpu0, or where
- * hot-unplugging is disabled, or where the kernel is too old
- * to support NUMA cells, etc. */
+/* Get a String value*/
static int
-virHostCPUGetValue(const char *dir, unsigned int cpu, const char *file,
- int default_value)
+virHostCPUGetStrValue(const char *dir, unsigned int cpu, const char *file, char
*value_str)
{
char *path;
FILE *pathfp;
- int value = -1;
- char value_str[INT_BUFSIZE_BOUND(value)];
- char *tmp;
+ int ret = -1;
if (virAsprintf(&path, "%s/cpu%u/%s", dir, cpu, file) < 0)
return -1;
pathfp = fopen(path, "r");
if (pathfp == NULL) {
- if (default_value >= 0 && errno == ENOENT)
- value = default_value;
+ if (errno == ENOENT)
+ return -2;
else
virReportSystemError(errno, _("cannot open %s"), path);
goto cleanup;
@@ -238,17 +230,84 @@ virHostCPUGetValue(const char *dir, unsigned int cpu, const char
*file,
virReportSystemError(errno, _("cannot read from %s"), path);
goto cleanup;
}
+
+ ret = 0;
+
+ cleanup:
+ VIR_FORCE_FCLOSE(pathfp);
+ VIR_FREE(path);
+ return ret;
+}
+
+
+/* Return the positive decimal contents of the given
+ * DIR/cpu%u/FILE, or -1 on error. If DEFAULT_VALUE is non-negative
+ * and the file could not be found, return that instead of an error;
+ * this is useful for machines that cannot hot-unplug cpu0, or where
+ * hot-unplugging is disabled, or where the kernel is too old
+ * to support NUMA cells, etc. */
+static int
+virHostCPUGetValue(const char *dir, unsigned int cpu, const char *file,
+ int default_value)
+{
+ int value = -1;
+ char value_str[INT_BUFSIZE_BOUND(value)];
+ char *tmp;
+ int ret;
+
+ if ((ret = (virHostCPUGetStrValue(dir, cpu, file, value_str))) < 0) {
+ if (ret == -2 && default_value >= 0)
+ return default_value;
+ else
+ return -1;
+ }
+
if (virStrToLong_i(value_str, &tmp, 10, &value) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("could not convert '%s' to an integer"),
value_str);
- goto cleanup;
+ return -1;
}
+ return value;
+}
- cleanup:
- VIR_FORCE_FCLOSE(pathfp);
- VIR_FREE(path);
+/* Return specific type cache size in KiB of given cpu
+ -1 on error happened */
+static
+int virHostCPUGetCache(unsigned int cpu, unsigned int type)
+{
+ char *cachedir = NULL;
+ char *cpudir;
+ char *unit = NULL;
+ char *tmp;
+ int value = -1;
+ unsigned long long size;
+ char value_str[INT_BUFSIZE_BOUND(value)];
+ if (virAsprintf(&cpudir, "%s/cpu", sysfs_system_path) < 0)
+ return -1;
+
+ if (virAsprintf(&cachedir, "cache/index%u/size", type) < 0)
+ goto error;
+
+ if (virHostCPUGetStrValue(cpudir, cpu, cachedir, value_str) < 0)
+ goto error;
+
+ if ((tmp = strchr(value_str, '\n'))) *tmp = '\0';
+
+ if (virStrToLong_i(value_str, &unit, 10, &value) < 0)
+ goto error;
+
+ size = value;
+
+ if (virScaleInteger(&size, unit, 1, ULLONG_MAX) < 0)
+ goto error;
+
+ return size / 1024;
+
+ error:
+ VIR_FREE(cpudir);
+ VIR_FREE(cachedir);
return value;
}
@@ -301,6 +360,23 @@ virHostCPUParseSocket(const char *dir,
return ret;
}
+/* return socket id of a given cpu*/
+static
+int virHostCPUGetSocketId(virArch hostarch, unsigned int cpu)
+{
+ char *cpu_dir;
+ int ret = -1;
+
+ if (virAsprintf(&cpu_dir, "%s/cpu", sysfs_system_path) < 0)
+ goto cleanup;
+
+ ret = virHostCPUParseSocket(cpu_dir, hostarch, cpu);
+
+ cleanup:
+ VIR_FREE(cpu_dir);
+ return ret;
+}
+
/* parses a node entry, returning number of processors in the node and
* filling arguments */
static int
@@ -1346,3 +1422,79 @@ virHostCPUGetKVMMaxVCPUs(void)
return -1;
}
#endif /* HAVE_LINUX_KVM_H */
+
+/* Fill all cache bank informations
+ * Return a list of virResCacheBankPtr, and fill cache bank information
+ * by loop for all cpus on host, number of cache bank will be set in nbanks
+ *
+ * NULL if error happened, and nbanks will be set 0. */
+virResCacheBankPtr virHostCPUGetCacheBanks(virArch arch, int type, size_t *nbanks, int
cbm_len)
+{
+ int npresent_cpus;
+ int idx;
+ size_t i;
+ virResCacheBankPtr bank;
+
+ *nbanks = 0;
+ if ((npresent_cpus = virHostCPUGetCount()) < 0)
+ return NULL;
+
+ switch (type) {
+ case VIR_RDT_RESOURCE_L3:
+ case VIR_RDT_RESOURCE_L3DATA:
+ case VIR_RDT_RESOURCE_L3CODE:
+ idx = 3;
+ break;
+ case VIR_RDT_RESOURCE_L2:
+ idx = 2;
+ break;
+ default:
+ idx = -1;
+ }
+
+ if (idx == -1)
+ return NULL;
+
+ if (VIR_ALLOC_N(bank, 1) < 0)
+ return NULL;
+
+ *nbanks = 1;
+
+ for (i = 0; i < npresent_cpus; i ++) {
+ int s_id;
+ int cache_size;
+
+ if ((s_id = virHostCPUGetSocketId(arch, i)) < 0)
+ goto error;
+
+ /* Expand cache bank array */
+ if (s_id > (*nbanks - 1)) {
+ size_t cur = *nbanks;
+ size_t exp = s_id - (*nbanks) + 1;
+ if (VIR_EXPAND_N(bank, cur, exp) < 0)
+ goto error;
+ *nbanks = s_id + 1;
+ }
+
+ if (bank[s_id].cpu_mask == NULL) {
+ if (!(bank[s_id].cpu_mask = virBitmapNew(npresent_cpus)))
+ goto error;
+ }
+
+ ignore_value(virBitmapSetBit(bank[s_id].cpu_mask, i));
+
+ if (bank[s_id].cache_size == 0) {
+ if ((cache_size = virHostCPUGetCache(i, idx)) < 0)
+ goto error;
+
+ bank[s_id].cache_size = cache_size;
+ bank[s_id].cache_min = cache_size / cbm_len;
+ }
+ }
+ return bank;
+
+ error:
+ *nbanks = 0;
+ VIR_FREE(bank);
+ return NULL;
+}
diff --git a/src/util/virhostcpu.h b/src/util/virhostcpu.h
index 39f7cf8..27f208e 100644
--- a/src/util/virhostcpu.h
+++ b/src/util/virhostcpu.h
@@ -27,6 +27,7 @@
# include "internal.h"
# include "virarch.h"
# include "virbitmap.h"
+# include "virresctrl.h"
# define VIR_HOST_CPU_MASK_LEN 1024
@@ -58,4 +59,9 @@ int virHostCPUStatsAssign(virNodeCPUStatsPtr param,
const char *name,
unsigned long long value);
+virResCacheBankPtr virHostCPUGetCacheBanks(virArch arch,
+ int type,
+ size_t *nbanks,
+ int cbm_len);
+
#endif /* __VIR_HOSTCPU_H__*/
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
new file mode 100644
index 0000000..df00559
--- /dev/null
+++ b/src/util/virresctrl.c
@@ -0,0 +1,202 @@
+/*
+ * virresctrl.c: methods for managing resource control
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>;.
+ *
+ * Authors:
+ * Eli Qiao <liyong.qiao(a)intel.com>
+ */
+#include <config.h>
+
+#include "virresctrl.h"
+#include "viralloc.h"
+#include "virerror.h"
+#include "virfile.h"
+#include "virhostcpu.h"
+#include "virlog.h"
+#include "virstring.h"
+#include "nodeinfo.h"
+#include "virarch.h"
+
+VIR_LOG_INIT("util.resctrl");
+
+#define VIR_FROM_THIS VIR_FROM_RESCTRL
+
+#define RESCTRL_DIR "/sys/fs/resctrl"
+#define RESCTRL_INFO_DIR "/sys/fs/resctrl/info"
+#define SYSFS_SYSTEM_PATH "/sys/devices/system"
+
+#define MAX_CPU_SOCKET_NUM 8
+#define MAX_CBM_BIT_LEN 32
+#define MAX_SCHEMATA_LEN 1024
+#define MAX_FILE_LEN (10 * 1024 * 1024)
+
+static unsigned int host_id;
+
+static virResCtrl resctrlall[] = {
+ {
+ .name = "L3",
+ .cache_level = "l3",
+ },
+ {
+ .name = "L3DATA",
+ .cache_level = "l3",
+ },
+ {
+ .name = "L3CODE",
+ .cache_level = "l3",
+ },
+ {
+ .name = "L2",
+ .cache_level = "l2",
+ },
+};
+
+static int virResCtrlGetInfoStr(const int type, const char *item, char **str)
+{
+ int ret = 0;
+ char *tmp;
+ char *path;
+
+ if (virAsprintf(&path, "%s/%s/%s", RESCTRL_INFO_DIR,
resctrlall[type].name, item) < 0)
+ return -1;
+ if (virFileReadAll(path, 10, str) < 0) {
+ ret = -1;
+ goto cleanup;
+ }
+
+ if ((tmp = strchr(*str, '\n'))) *tmp = '\0';
+
+ cleanup:
+ VIR_FREE(path);
+ return ret;
+}
+
+static int virResCtrlReadConfig(virArch arch, int type)
+{
+ int ret;
+ size_t i, nbanks;
+ char *str;
+
+ /* Read num_closids from resctrl.
+ eg: /sys/fs/resctrl/info/L3/num_closids */
+ if ((ret = virResCtrlGetInfoStr(type, "num_closids", &str)) < 0)
+ goto error;
+
+ if ((ret = virStrToLong_i(str, NULL, 10, &resctrlall[type].num_closid)) < 0)
+ goto error;
+
+ VIR_FREE(str);
+
+ /* Read min_cbm_bits from resctrl.
+ eg: /sys/fs/resctrl/info/L3/cbm_mask */
+ if ((ret = virResCtrlGetInfoStr(type, "min_cbm_bits", &str)) < 0)
+ goto error;
+
+ if ((ret = virStrToLong_i(str, NULL, 10, &resctrlall[type].min_cbm_bits)) <
0)
+ goto error;
+
+ VIR_FREE(str);
+
+ /* Read cbm_mask string from resctrl.
+ eg: /sys/fs/resctrl/info/L3/cbm_mask */
+ if ((ret = virResCtrlGetInfoStr(type, "cbm_mask", &str)) < 0)
+ goto error;
+
+ /* cbm_mask is in hex, eg: "fffff", calculate cbm length from the default
+ cbm_mask. */
+ resctrlall[type].cbm_len = strlen(str) * 4;
+
+ /* Get all cache bank informations */
+ resctrlall[type].cache_banks = virHostCPUGetCacheBanks(arch,
+ type,
+ &nbanks,
resctrlall[type].cbm_len);
+
+ if (resctrlall[type].cache_banks == NULL)
+ goto error;
+
+ resctrlall[type].num_banks = nbanks;
+
+ for (i = 0; i < resctrlall[type].num_banks; i++) {
+ /* L3CODE and L3DATA shares same L3 resource, so they should
+ * have same host_id. */
+ if (type == VIR_RDT_RESOURCE_L3CODE)
+ resctrlall[type].cache_banks[i].host_id =
resctrlall[VIR_RDT_RESOURCE_L3DATA].cache_banks[i].host_id;
+ else
+ resctrlall[type].cache_banks[i].host_id = host_id++;
+ }
+
+ resctrlall[type].enabled = true;
+
+ ret = 0;
+
+ error:
+ VIR_FREE(str);
+ return ret;
+}
+
+int
+virResCtrlInit(void)
+{
+ size_t i = 0;
+ char *tmp;
+ int rc = 0;
+
+ virArch hostarch;
+
+ hostarch = virArchFromHost();
+
+ for (i = 0; i < VIR_RDT_RESOURCE_LAST; i++) {
+ if ((rc = virAsprintf(&tmp, "%s/%s", RESCTRL_INFO_DIR,
resctrlall[i].name)) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Failed to initialize resource control config"));
+ goto cleanup;
+ }
+
+ if (virFileExists(tmp)) {
+ if ((rc = virResCtrlReadConfig(hostarch, i)) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Failed to get resource control config"));
+ goto cleanup;
+ }
+ }
+ VIR_FREE(tmp);
+ }
+
+ cleanup:
+ VIR_FREE(tmp);
+ return rc;
+}
+
+/*
+ * Test whether the host support resource control
+ */
+bool
+virResCtrlAvailable(void)
+{
+ if (!virFileExists(RESCTRL_INFO_DIR))
+ return false;
+ return true;
+}
+
+/*
+ * Return an virResCtrlPtr point to virResCtrl object,
+ * We should not modify it out side of virresctrl.c
+ */
+virResCtrlPtr
+virResCtrlGet(int type)
+{
+ return &resctrlall[type];
+}
diff --git a/src/util/virresctrl.h b/src/util/virresctrl.h
new file mode 100644
index 0000000..5a6a344
--- /dev/null
+++ b/src/util/virresctrl.h
@@ -0,0 +1,78 @@
+/*
+ * virresctrl.h: header for managing resctrl control
+ *
+ * Copyright (C) 2016 Intel, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>;.
+ *
+ * Authors:
+ * Eli Qiao <liyong.qiao(a)intel.com>
+ */
+
+#ifndef __VIR_RESCTRL_H__
+# define __VIR_RESCTRL_H__
+
+# include "virbitmap.h"
+
+enum {
+ VIR_RDT_RESOURCE_L3,
+ VIR_RDT_RESOURCE_L3DATA,
+ VIR_RDT_RESOURCE_L3CODE,
+ VIR_RDT_RESOURCE_L2,
+ /* Must be the last */
+ VIR_RDT_RESOURCE_LAST,
+};
+
+
+typedef struct _virResCacheBank virResCacheBank;
+typedef virResCacheBank *virResCacheBankPtr;
+struct _virResCacheBank {
+ unsigned int host_id;
+ unsigned long long cache_size;
+ unsigned long long cache_left;
+ unsigned long long cache_min;
+ virBitmapPtr cpu_mask;
+};
+
+/**
+ * struct rdt_resource - attributes of an RDT resource
+ * @enabled: Is this feature enabled on this machine
+ * @name: Name to use in "schemata" file
+ * @num_closid: Number of CLOSIDs available
+ * @max_cbm: Largest Cache Bit Mask allowed
+ * @min_cbm_bits: Minimum number of consecutive bits to be set
+ * in a cache bit mask
+ * @cache_level: Which cache level defines scope of this domain
+ * @num_banks: Number of cache bank on this machine.
+ * @cache_banks: Array of cache bank
+ */
+typedef struct _virResCtrl virResCtrl;
+typedef virResCtrl *virResCtrlPtr;
+struct _virResCtrl {
+ bool enabled;
+ const char *name;
+ int num_closid;
+ int cbm_len;
+ int min_cbm_bits;
+ const char* cache_level;
+ int num_banks;
+ virResCacheBankPtr cache_banks;
+};
+
+bool virResCtrlAvailable(void);
+int virResCtrlInit(void);
+virResCtrlPtr virResCtrlGet(int);
+
+#endif
--
1.9.1
8:01 p.m.
New subject: [libvirt] [PATH v8 02/10] Resctrl: expose cache information to capabilities
This patch expose cache information to host's capabilites xml.
For l3 cache allocation
<cache>
<bank id='0' type='l3' size='56320' unit='KiB'
cpus='0-21,44-65'>
<control min='2816' reserved='2816' unit='KiB'
scope='L3'/>
</bank>
<bank id='1' type='l3' size='56320' unit='KiB'
cpus='22-43,66-87'>
<control min='2816' reserved='2816' unit='KiB'
scope='L3'/>
</bank>
</cache>
For l3 cache allocation supported cdp(seperate data/code):
<cache>
<bank id='0' type='l3' size='56320' unit='KiB'
cpus='0-21,44-65'>
<control min='2816' reserved='2816' unit='KiB'
scope='L3DATA'/>
<control min='2816' reserved='2816' unit='KiB'
scope='L3CODE'/>
</bank>
<bank id='1' type='l3' size='56320' unit='KiB'
cpus='22-43,66-87'>
<control min='2816' reserved='2816' unit='KiB'
scope='L3DATA'/>
<control min='2816' reserved='2816' unit='KiB'
scope='L3CODE'/>
</bank>
</cache>
RFC on mailing list.
https://www.redhat.com/archives/libvir-list/2017-January/msg00644.html
Signed-off-by: Eli Qiao <liyong.qiao(a)intel.com>
---
src/conf/capabilities.c | 56 ++++++++++++++++++++++++++++++++++++++
src/conf/capabilities.h | 23 ++++++++++++++++
src/libvirt_private.syms | 3 +++
src/nodeinfo.c | 64 ++++++++++++++++++++++++++++++++++++++++++++
src/nodeinfo.h | 1 +
src/qemu/qemu_capabilities.c | 8 ++++++
src/qemu/qemu_driver.c | 4 +++
7 files changed, 159 insertions(+)
diff --git a/src/conf/capabilities.c b/src/conf/capabilities.c
index 9ab343b..23e21e4 100644
--- a/src/conf/capabilities.c
+++ b/src/conf/capabilities.c
@@ -198,6 +198,18 @@ virCapabilitiesClearSecModel(virCapsHostSecModelPtr secmodel)
}
static void
+virCapabilitiesClearCacheBank(virCapsHostCacheBankPtr cachebank)
+{
+ size_t i;
+ for (i = 0; i < cachebank->ncontrol; i++)
+ VIR_FREE(cachebank->control[i].scope);
+
+ VIR_FREE(cachebank->type);
+ VIR_FREE(cachebank->cpus);
+}
+
+
+static void
virCapabilitiesDispose(void *object)
{
virCapsPtr caps = object;
@@ -221,6 +233,10 @@ virCapabilitiesDispose(void *object)
virCapabilitiesClearSecModel(&caps->host.secModels[i]);
VIR_FREE(caps->host.secModels);
+ for (i = 0; i < caps->host.ncachebank; i++)
+ virCapabilitiesClearCacheBank(caps->host.cachebank[i]);
+ VIR_FREE(caps->host.cachebank);
+
VIR_FREE(caps->host.netprefix);
VIR_FREE(caps->host.pagesSize);
virCPUDefFree(caps->host.cpu);
@@ -844,6 +860,41 @@ virCapabilitiesFormatNUMATopology(virBufferPtr buf,
return 0;
}
+static int
+virCapabilitiesFormatCache(virBufferPtr buf,
+ size_t ncachebank,
+ virCapsHostCacheBankPtr *cachebank)
+{
+ size_t i;
+ size_t j;
+
+ virBufferAddLit(buf, "<cache>\n");
+ virBufferAdjustIndent(buf, 2);
+
+ for (i = 0; i < ncachebank; i++) {
+ virBufferAsprintf(buf,
+ "<bank id='%u' type='%s'
size='%llu' unit='KiB' cpus='%s'>\n",
+ cachebank[i]->id,
+ cachebank[i]->type,
+ cachebank[i]->size,
+ cachebank[i]->cpus);
+
+ virBufferAdjustIndent(buf, 2);
+ for (j = 0; j < cachebank[i]->ncontrol; j++) {
+ virBufferAsprintf(buf,
+ "<control min='%llu'
reserved='%llu' unit='KiB' scope='%s'/>\n",
+ cachebank[i]->control[j].min,
+ cachebank[i]->control[j].reserved,
+ cachebank[i]->control[j].scope);
+ }
+ virBufferAdjustIndent(buf, -2);
+ virBufferAddLit(buf, "</bank>\n");
+ }
+ virBufferAdjustIndent(buf, -2);
+ virBufferAddLit(buf, "</cache>\n");
+ return 0;
+}
+
/**
* virCapabilitiesFormatXML:
* @caps: capabilities to format
@@ -931,6 +982,11 @@ virCapabilitiesFormatXML(virCapsPtr caps)
virBufferAddLit(&buf, "</migration_features>\n");
}
+ if (caps->host.ncachebank &&
+ virCapabilitiesFormatCache(&buf, caps->host.ncachebank,
+ caps->host.cachebank) < 0)
+ return NULL;
+
if (caps->host.netprefix)
virBufferAsprintf(&buf, "<netprefix>%s</netprefix>\n",
caps->host.netprefix);
diff --git a/src/conf/capabilities.h b/src/conf/capabilities.h
index cfdc34a..b446de5 100644
--- a/src/conf/capabilities.h
+++ b/src/conf/capabilities.h
@@ -138,6 +138,25 @@ struct _virCapsHostSecModel {
virCapsHostSecModelLabelPtr labels;
};
+typedef struct _virCapsHostCacheControl virCapsHostCacheControl;
+typedef virCapsHostCacheControl *virCapsHostCacheControlPtr;
+struct _virCapsHostCacheControl {
+ unsigned long long min;
+ unsigned long long reserved;
+ char* scope;
+};
+
+typedef struct _virCapsHostCacheBank virCapsHostCacheBank;
+typedef virCapsHostCacheBank *virCapsHostCacheBankPtr;
+struct _virCapsHostCacheBank {
+ unsigned int id;
+ char* type;
+ char* cpus;
+ unsigned long long size;
+ size_t ncontrol;
+ virCapsHostCacheControlPtr control;
+};
+
typedef struct _virCapsHost virCapsHost;
typedef virCapsHost *virCapsHostPtr;
struct _virCapsHost {
@@ -160,6 +179,10 @@ struct _virCapsHost {
size_t nsecModels;
virCapsHostSecModelPtr secModels;
+ size_t ncachebank;
+ size_t ncachebank_max;
+ virCapsHostCacheBankPtr *cachebank;
+
char *netprefix;
virCPUDefPtr cpu;
int nPagesSize; /* size of pagesSize array */
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 743e5ac..cc6c433 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1123,6 +1123,7 @@ virLogManagerNew;
# nodeinfo.h
nodeCapsInitNUMA;
nodeGetInfo;
+virCapsInitCache;
virHostCPUGetCount;
virHostCPUGetKVMMaxVCPUs;
virHostCPUGetMap;
@@ -2315,8 +2316,10 @@ virRandomInt;
# util/virresctrl.h
virResCtrlAvailable;
+virResCtrlGet;
virResCtrlInit;
+
# util/virrotatingfile.h
virRotatingFileReaderConsume;
virRotatingFileReaderFree;
diff --git a/src/nodeinfo.c b/src/nodeinfo.c
index f2ded02..a001cd0 100644
--- a/src/nodeinfo.c
+++ b/src/nodeinfo.c
@@ -48,6 +48,7 @@
#include "virstring.h"
#include "virnuma.h"
#include "virlog.h"
+#include "virresctrl.h"
#define VIR_FROM_THIS VIR_FROM_NONE
@@ -416,3 +417,66 @@ nodeCapsInitNUMA(virCapsPtr caps)
VIR_FREE(pageinfo);
return ret;
}
+
+int
+virCapsInitCache(virCapsPtr caps)
+{
+ size_t i, j;
+ virResCtrlPtr resctrl;
+ virCapsHostCacheBankPtr bank;
+
+ for (i = 0; i < VIR_RDT_RESOURCE_LAST; i++) {
+ /* L3DATA and L3CODE share L3 resources */
+ if (i == VIR_RDT_RESOURCE_L3CODE)
+ continue;
+
+ resctrl = virResCtrlGet(i);
+
+ if (resctrl->enabled) {
+ for (j = 0; j < resctrl->num_banks; j++) {
+ if (VIR_RESIZE_N(caps->host.cachebank, caps->host.ncachebank_max,
+ caps->host.ncachebank, 1) < 0)
+ return -1;
+
+ if (VIR_ALLOC(bank) < 0)
+ return -1;
+
+ bank->id = resctrl->cache_banks[j].host_id;
+ if (VIR_STRDUP(bank->type, resctrl->cache_level) < 0)
+ goto err;
+ if (VIR_STRDUP(bank->cpus,
virBitmapFormat(resctrl->cache_banks[j].cpu_mask)) < 0)
+ goto err;
+ bank->size = resctrl->cache_banks[j].cache_size;
+ /*L3DATA and L3CODE shares L3 cache resources, so fill them to the
control element*/
+ if (i == VIR_RDT_RESOURCE_L3DATA) {
+ if (VIR_EXPAND_N(bank->control, bank->ncontrol, 2) < 0)
+ goto err;
+
+ bank->control[0].min =
virResCtrlGet(VIR_RDT_RESOURCE_L3DATA)->cache_banks[j].cache_min;
+ bank->control[0].reserved = bank->control[0].min *
(virResCtrlGet(VIR_RDT_RESOURCE_L3DATA)->min_cbm_bits);
+ if (VIR_STRDUP(bank->control[0].scope,
+ virResCtrlGet(VIR_RDT_RESOURCE_L3DATA)->name) <
0)
+ goto err;
+
+ bank->control[1].min =
virResCtrlGet(VIR_RDT_RESOURCE_L3CODE)->cache_banks[j].cache_min;
+ bank->control[1].reserved = bank->control[1].min *
(virResCtrlGet(VIR_RDT_RESOURCE_L3CODE)->min_cbm_bits);
+ if (VIR_STRDUP(bank->control[1].scope,
+ virResCtrlGet(VIR_RDT_RESOURCE_L3CODE)->name) <
0)
+ goto err;
+ } else {
+ if (VIR_EXPAND_N(bank->control, bank->ncontrol, 1) < 0)
+ goto err;
+ bank->control[0].min = resctrl->cache_banks[j].cache_min;
+ bank->control[0].reserved = bank->control[0].min *
resctrl->min_cbm_bits;
+ if (VIR_STRDUP(bank->control[0].scope, resctrl->name) < 0)
+ goto err;
+ }
+ caps->host.cachebank[caps->host.ncachebank++] = bank;
+ }
+ }
+ }
+ return 0;
+ err:
+ VIR_FREE(bank);
+ return -1;
+}
diff --git a/src/nodeinfo.h b/src/nodeinfo.h
index 3c4dc46..5eb0f83 100644
--- a/src/nodeinfo.h
+++ b/src/nodeinfo.h
@@ -28,5 +28,6 @@
int nodeGetInfo(virNodeInfoPtr nodeinfo);
int nodeCapsInitNUMA(virCapsPtr caps);
+int virCapsInitCache(virCapsPtr caps);
#endif /* __VIR_NODEINFO_H__*/
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 3247d25..662a9ed 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -1098,6 +1098,11 @@ virQEMUCapsInitCPU(virCapsPtr caps,
goto cleanup;
}
+static int
+virQEMUCapsInitCache(virCapsPtr caps)
+{
+ return virCapsInitCache(caps);
+}
static int
virQEMUCapsInitPages(virCapsPtr caps)
@@ -1144,6 +1149,9 @@ virCapsPtr virQEMUCapsInit(virQEMUCapsCachePtr cache)
if (virQEMUCapsInitCPU(caps, hostarch) < 0)
VIR_WARN("Failed to get host CPU");
+ if (virQEMUCapsInitCache(caps) < 0)
+ VIR_WARN("Failed to get host cache");
+
/* Add the power management features of the host */
if (virNodeSuspendGetTargetMask(&caps->host.powerMgmt) < 0)
VIR_WARN("Failed to get host power management capabilities");
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 37ccfdf..7995511 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -105,6 +105,7 @@
#include "vircgroup.h"
#include "virperf.h"
#include "virnuma.h"
+#include "virresctrl.h"
#include "dirname.h"
#include "network/bridge_driver.h"
@@ -849,6 +850,9 @@ qemuStateInitialize(bool privileged,
run_gid = cfg->group;
}
+ if (virResCtrlAvailable() && virResCtrlInit() < 0)
+ VIR_WARN("Faild to initialize resource control.");
+
qemu_driver->qemuCapsCache = virQEMUCapsCacheNew(cfg->libDir,
cfg->cacheDir,
run_uid,
--
1.9.1
8:01 p.m.
New subject: [libvirt] [PATH v8 03/10] Resctrl: Add new xml element to support cache tune
This patch adds new xml element to support cache tune as:
<cputune>
...
<cachetune id='1' host_id='0' type='l3' size='2816'
unit='KiB'
vcpus='1,2'/>
...
</cputune>
id: any non-minus number
host_id: reference of the host's cache banks id, it's from capabilities
type: cache bank type
size: should be multiples of the min_size of the bank on host.
vcpus: cache allocation on vcpu set, if empty, will apply the allocation
on all vcpus
---
docs/schemas/domaincommon.rng | 46 +++++++++++++
src/conf/domain_conf.c | 152 ++++++++++++++++++++++++++++++++++++++++++
src/conf/domain_conf.h | 19 ++++++
src/util/virresctrl.c | 29 ++++++--
src/util/virresctrl.h | 4 +-
5 files changed, 244 insertions(+), 6 deletions(-)
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index cc6e0d0..edb2888 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -795,6 +795,32 @@
</attribute>
</element>
</zeroOrMore>
+ <zeroOrMore>
+ <element name="cachetune">
+ <attribute name="id">
+ <ref name="cacheid"/>
+ </attribute>
+ <attribute name="host_id">
+ <ref name="hostid"/>
+ </attribute>
+ <attribute name="type">
+ <ref name="cachetype"/>
+ </attribute>
+ <attribute name="size">
+ <ref name="unsignedInt"/>
+ </attribute>
+ <optional>
+ <attribute name="unit">
+ <ref name="cacheunit"/>
+ </attribute>
+ </optional>
+ <optional>
+ <attribute name="vcpus">
+ <ref name="cpuset"/>
+ </attribute>
+ </optional>
+ </element>
+ </zeroOrMore>
<optional>
<element name="emulatorpin">
<attribute name="cpuset">
@@ -5451,6 +5477,26 @@
<param name="minInclusive">-1</param>
</data>
</define>
+ <define name="cacheid">
+ <data type="unsignedShort">
+ <param name="pattern">[0-9]+</param>
+ </data>
+ </define>
+ <define name="hostid">
+ <data type="unsignedShort">
+ <param name="pattern">[0-9]+</param>
+ </data>
+ </define>
+ <define name="cachetype">
+ <data type="string">
+ <param name="pattern">(l3)</param>
+ </data>
+ </define>
+ <define name="cacheunit">
+ <data type="string">
+ <param name="pattern">KiB</param>
+ </data>
+ </define>
<!-- weight currently is in range [100, 1000] -->
<define name="weight">
<data type="unsignedInt">
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index c06b128..430c451 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -56,6 +56,7 @@
#include "virstring.h"
#include "virnetdev.h"
#include "virhostdev.h"
+#include "virresctrl.h"
#define VIR_FROM_THIS VIR_FROM_DOMAIN
@@ -15604,6 +15605,127 @@ virDomainVcpuPinDefParseXML(virDomainDefPtr def,
return ret;
}
+/* Parse the XML definition for cachetune
+ * and a cachetune has the form
+ * <cachetune id='0' host_id='0' type='l3' size='1024'
unit='KiB'/>
+ */
+static int
+virDomainCacheTuneDefParseXML(virDomainDefPtr def,
+ int n,
+ xmlNodePtr* nodes)
+{
+ char* tmp = NULL;
+ size_t i, j;
+ int type = -1;
+ virDomainCacheBankPtr bank = NULL;
+ virResCtrlPtr resctrl;
+
+ if (VIR_ALLOC_N(bank, n) < 0)
+ goto cleanup;
+
+ for (i = 0; i < n; i++) {
+ if (!(tmp = virXMLPropString(nodes[i], "id"))) {
+ virReportError(VIR_ERR_XML_ERROR, "%s", _("missing id in cache
tune"));
+ goto cleanup;
+ }
+ if (virStrToLong_uip(tmp, NULL, 10, &(bank[i].id)) < 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("invalid setting for cache id '%s'"),
tmp);
+ goto cleanup;
+ }
+
+ VIR_FREE(tmp);
+ if (!(tmp = virXMLPropString(nodes[i], "host_id"))) {
+ virReportError(VIR_ERR_XML_ERROR, "%s", _("missing host id in
cache tune"));
+ goto cleanup;
+ }
+ if (virStrToLong_uip(tmp, NULL, 10, &(bank[i].host_id)) < 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("invalid setting for cache host id '%s'"),
tmp);
+ goto cleanup;
+ }
+ VIR_FREE(tmp);
+
+ if (!(tmp = virXMLPropString(nodes[i], "size"))) {
+ virReportError(VIR_ERR_XML_ERROR, "%s", _("missing size in
cache tune"));
+ goto cleanup;
+ }
+ if (virStrToLong_ull(tmp, NULL, 10, &(bank[i].size)) < 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("invalid setting for cache size '%s'"),
tmp);
+ goto cleanup;
+ }
+ VIR_FREE(tmp);
+
+ if (!(tmp = virXMLPropString(nodes[i], "type"))) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("missing cache type"));
+ goto cleanup;
+ }
+
+ if ((type = virResCtrlTypeFromString(tmp)) < 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("'unsupported cache type '%s'"), tmp);
+ goto cleanup;
+ }
+
+ resctrl = virResCtrlGet(type);
+
+ if (resctrl == NULL || !resctrl->enabled) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("'host doesn't enabled cache type '%s'"),
tmp);
+ goto cleanup;
+ }
+
+ bool found_host_id = false;
+ /* Loop for banks to search host_id */
+ for (j = 0; j < resctrl->num_banks; j++) {
+ if (resctrl->cache_banks[j].host_id == bank[i].host_id) {
+ found_host_id = true;
+ break;
+ }
+ }
+
+ if (! found_host_id) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("'cache bank's host id %u not found on the
host"),
+ bank[i].host_id);
+ goto cleanup;
+ }
+
+ if (bank[i].size == 0 ||
+ bank[i].size % resctrl->cache_banks[j].cache_min != 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("'the size should be multiples of
'%llu'"),
+ resctrl->cache_banks[j].cache_min);
+ goto cleanup;
+ }
+
+ if (VIR_STRDUP(bank[i].type, tmp) < 0)
+ goto cleanup;
+
+ if ((tmp = virXMLPropString(nodes[i], "vcpus"))) {
+ if (virBitmapParse(tmp, &bank[i].vcpus,
+ VIR_DOMAIN_CPUMASK_LEN) < 0)
+ goto cleanup;
+
+ if (virBitmapIsAllClear(bank[i].vcpus)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Invalid value of 'vcpus': %s"), tmp);
+ goto cleanup;
+ }
+ }
+ }
+
+ def->cachetune.cache_banks = bank;
+ def->cachetune.n_banks = n;
+ return 0;
+
+ cleanup:
+ VIR_FREE(bank);
+ VIR_FREE(tmp);
+ return -1;
+}
/* Parse the XML definition for a iothreadpin
* and an iothreadspin has the form
@@ -16882,6 +17004,14 @@ virDomainDefParseXML(xmlDocPtr xml,
}
VIR_FREE(nodes);
+ if ((n = virXPathNodeSet("./cputune/cachetune", ctxt, &nodes)) < 0)
+ goto error;
+
+ if (virDomainCacheTuneDefParseXML(def, n, nodes) < 0)
+ goto error;
+
+ VIR_FREE(nodes);
+
if ((n = virXPathNodeSet("./cputune/emulatorpin", ctxt, &nodes)) <
0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("cannot extract emulatorpin nodes"));
@@ -23398,6 +23528,26 @@ virDomainSchedulerFormat(virBufferPtr buf,
}
+static void
+virDomainCacheTuneDefFormat(virBufferPtr buf,
+ virDomainCachetunePtr cache)
+{
+ size_t i;
+ for (i = 0; i < cache->n_banks; i ++) {
+ virBufferAsprintf(buf, "<cachetune id='%u' host_id='%u'
"
+ "type='%s' size='%llu'
unit='KiB'",
+ cache->cache_banks[i].id,
+ cache->cache_banks[i].host_id,
+ cache->cache_banks[i].type,
+ cache->cache_banks[i].size);
+
+ if (cache->cache_banks[i].vcpus)
+ virBufferAsprintf(buf, " vcpus='%s'/>\n",
+ virBitmapFormat(cache->cache_banks[i].vcpus));
+ else
+ virBufferAddLit(buf, "/>\n");
+ }
+}
static int
virDomainCputuneDefFormat(virBufferPtr buf,
@@ -23461,6 +23611,8 @@ virDomainCputuneDefFormat(virBufferPtr buf,
VIR_FREE(cpumask);
}
+ virDomainCacheTuneDefFormat(&childrenBuf, &def->cachetune);
+
if (def->cputune.emulatorpin) {
char *cpumask;
virBufferAddLit(&childrenBuf, "<emulatorpin ");
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 507ace8..fa47fe4 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2132,6 +2132,23 @@ struct _virDomainMemtune {
unsigned long long swap_hard_limit; /* in kibibytes, limit at off_t bytes */
};
+typedef struct _virDomainCacheBank virDomainCacheBank;
+typedef virDomainCacheBank *virDomainCacheBankPtr;
+struct _virDomainCacheBank {
+ unsigned int id;
+ unsigned int host_id;
+ unsigned long long size;
+ char *type;
+ virBitmapPtr vcpus;
+};
+
+typedef struct _virDomainCachetune virDomainCachetune;
+typedef virDomainCachetune *virDomainCachetunePtr;
+struct _virDomainCachetune {
+ size_t n_banks;
+ virDomainCacheBankPtr cache_banks;
+};
+
typedef struct _virDomainPowerManagement virDomainPowerManagement;
typedef virDomainPowerManagement *virDomainPowerManagementPtr;
@@ -2196,6 +2213,8 @@ struct _virDomainDef {
virDomainCputune cputune;
+ virDomainCachetune cachetune;
+
virDomainNumaPtr numa;
virDomainResourceDefPtr resource;
virDomainIdMapDef idmap;
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index df00559..388249c 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -33,15 +33,34 @@
VIR_LOG_INIT("util.resctrl");
#define VIR_FROM_THIS VIR_FROM_RESCTRL
-
-#define RESCTRL_DIR "/sys/fs/resctrl"
-#define RESCTRL_INFO_DIR "/sys/fs/resctrl/info"
-#define SYSFS_SYSTEM_PATH "/sys/devices/system"
-
#define MAX_CPU_SOCKET_NUM 8
#define MAX_CBM_BIT_LEN 32
#define MAX_SCHEMATA_LEN 1024
#define MAX_FILE_LEN (10 * 1024 * 1024)
+#define RESCTRL_DIR "/sys/fs/resctrl"
+#define RESCTRL_INFO_DIR "/sys/fs/resctrl/info"
+#define SYSFS_SYSTEM_PATH "/sys/devices/system"
+
+VIR_ENUM_IMPL(virResCtrl, VIR_RDT_RESOURCE_LAST,
+ "l3", "l3data", "l3code", "l2");
+
+#define CONSTRUCT_RESCTRL_PATH(domain_name, item_name) \
+do { \
+ if (NULL == domain_name) { \
+ if (virAsprintf(&path, "%s/%s", RESCTRL_DIR, item_name) < 0)\
+ return -1; \
+ } else { \
+ if (virAsprintf(&path, "%s/%s/%s", RESCTRL_DIR, \
+ domain_name, \
+ item_name) < 0) \
+ return -1; \
+ } \
+} while (0)
+
+#define VIR_RESCTRL_ENABLED(type) \
+ resctrlall[type].enabled
+
+#define VIR_RESCTRL_GET_SCHEMATA(count) ((1 << count) - 1)
static unsigned int host_id;
diff --git a/src/util/virresctrl.h b/src/util/virresctrl.h
index 5a6a344..074d307 100644
--- a/src/util/virresctrl.h
+++ b/src/util/virresctrl.h
@@ -25,6 +25,7 @@
# define __VIR_RESCTRL_H__
# include "virbitmap.h"
+# include "virutil.h"
enum {
VIR_RDT_RESOURCE_L3,
@@ -32,9 +33,10 @@ enum {
VIR_RDT_RESOURCE_L3CODE,
VIR_RDT_RESOURCE_L2,
/* Must be the last */
- VIR_RDT_RESOURCE_LAST,
+ VIR_RDT_RESOURCE_LAST
};
+VIR_ENUM_DECL(virResCtrl);
typedef struct _virResCacheBank virResCacheBank;
typedef virResCacheBank *virResCacheBankPtr;
--
1.9.1
8:01 p.m.
New subject: [libvirt] [PATH v8 04/10] Resctrl: Add private interfaces to operate cache bank
virResCtrlSetCacheBanks: Set cache banks of a libvirt domain. It will
create new resource domain under
`/sys/fs/resctrl` and fill the schemata according
the cache bank configration.
virResCtrlUpdate: Destroy resctrl domain directory, and update the schemata
after libvirt domain destroy.
Signed-off-by: Eli Qiao <liyong.qiao(a)intel.com>
---
src/libvirt_private.syms | 6 +-
src/util/virresctrl.c | 667 +++++++++++++++++++++++++++++++++++++++++++++++
src/util/virresctrl.h | 5 +-
3 files changed, 676 insertions(+), 2 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index cc6c433..85b9e94 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2318,7 +2318,11 @@ virRandomInt;
virResCtrlAvailable;
virResCtrlGet;
virResCtrlInit;
-
+virResCtrlSetCacheBanks;
+virResCtrlTypeFromString;
+virResCtrlTypeToString;
+virResCtrlUpdate;
+#
# util/virrotatingfile.h
virRotatingFileReaderConsume;
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index 388249c..cb46e36 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -19,6 +19,8 @@
* Eli Qiao <liyong.qiao(a)intel.com>
*/
#include <config.h>
+#include <fcntl.h>
+#include <sys/stat.h>
#include "virresctrl.h"
#include "viralloc.h"
@@ -62,8 +64,58 @@ do { \
#define VIR_RESCTRL_GET_SCHEMATA(count) ((1 << count) - 1)
+/**
+ * a virResSchemata represents a schemata object under a resource control
+ * domain.
+ */
+typedef struct _virResSchemataItem virResSchemataItem;
+typedef virResSchemataItem *virResSchemataItemPtr;
+struct _virResSchemataItem {
+ unsigned int socket_no;
+ unsigned schemata;
+};
+
+typedef struct _virResSchemata virResSchemata;
+typedef virResSchemata *virResSchemataPtr;
+struct _virResSchemata {
+ unsigned int n_schemata_items;
+ virResSchemataItemPtr schemata_items;
+};
+
+/**
+ * a virResDomain represents a resource control domain. It's a double linked
+ * list.
+ */
+
+typedef struct _virResDomain virResDomain;
+typedef virResDomain *virResDomainPtr;
+
+struct _virResDomain {
+ char *name;
+ virResSchemataPtr schematas[VIR_RDT_RESOURCE_LAST];
+ char **tasks;
+ size_t n_tasks;
+ size_t n_sockets;
+ virResDomainPtr pre;
+ virResDomainPtr next;
+};
+
+/* All resource control domains on this host*/
+typedef struct _virResCtrlDomain virResCtrlDomain;
+typedef virResCtrlDomain *virResCtrlDomainPtr;
+
+struct _virResCtrlDomain {
+ unsigned int num_domains;
+ virResDomainPtr domains;
+};
+
static unsigned int host_id;
+/* Global static struct to be maintained which is a interface */
+static virResCtrlDomain domainall;
+
+/* Global static struct array to be maintained which indicate
+ * resource status on a host */
static virResCtrl resctrlall[] = {
{
.name = "L3",
@@ -83,6 +135,61 @@ static virResCtrl resctrlall[] = {
},
};
+/*
+ * How many bits is set in schemata
+ * eg:
+ * virResCtrlBitsNum(1011) = 2 */
+static int virResCtrlBitsContinuesNum(unsigned schemata)
+{
+ size_t i;
+ int ret = 0;
+ for (i = 0; i < MAX_CBM_BIT_LEN; i ++) {
+ if ((schemata & 0x1) == 0x1)
+ ret++;
+ else
+ break;
+ schemata = schemata >> 1;
+ if (schemata == 0) break;
+ }
+ return ret;
+}
+
+static int virResCtrlGetStr(const char *domain_name, const char *item_name, char **ret)
+{
+ char *path;
+ int rc = 0;
+
+ CONSTRUCT_RESCTRL_PATH(domain_name, item_name);
+
+ if (virFileReadAll(path, MAX_FILE_LEN, ret) < 0) {
+ rc = -1;
+ goto cleanup;
+ }
+
+ cleanup:
+ VIR_FREE(path);
+ return rc;
+}
+
+static int virResCtrlGetSchemata(const int type, const char *name, char **schemata)
+{
+ int rc;
+ char *tmp, *end;
+ char *buf;
+
+ if ((rc = virResCtrlGetStr(name, "schemata", &buf)) < 0)
+ return rc;
+
+ tmp = strstr(buf, resctrlall[type].name);
+ end = strchr(tmp, '\n');
+ *end = '\0';
+ if (VIR_STRDUP(*schemata, tmp) < 0)
+ rc = -1;
+
+ VIR_FREE(buf);
+ return rc;
+}
+
static int virResCtrlGetInfoStr(const int type, const char *item, char **str)
{
int ret = 0;
@@ -103,6 +210,71 @@ static int virResCtrlGetInfoStr(const int type, const char *item,
char **str)
return ret;
}
+/* Return pointer of and ncount of schemata*/
+static virResSchemataPtr virParseSchemata(const char *schemata_str, size_t *ncount)
+{
+ const char *p, *q;
+ int pos;
+ int ischemata;
+ virResSchemataPtr schemata;
+ virResSchemataItemPtr schemataitems, tmpitem;
+ unsigned int socket_no = 0;
+ char *tmp;
+
+ if (VIR_ALLOC(schemata) < 0)
+ goto cleanup;
+
+ p = q = schemata_str;
+ pos = strchr(schemata_str, ':') - p;
+
+ /* calculate cpu socket count */
+ *ncount = 1;
+ while ((q = strchr(p, ';')) != 0) {
+ p = q + 1;
+ (*ncount)++;
+ }
+
+ /* allocat an arrry to store schemata for each socket*/
+ if (VIR_ALLOC_N_QUIET(tmpitem, *ncount) < 0)
+ goto cleanup;
+
+ schemataitems = tmpitem;
+
+ p = q = schemata_str + pos + 1;
+
+ while (*p != '\0') {
+ if (*p == '=') {
+ q = p + 1;
+
+ tmpitem->socket_no = socket_no++;
+
+ while (*p != ';' && *p != '\0') p++;
+
+ if (VIR_STRNDUP(tmp, q, p-q) < 0)
+ goto cleanup;
+
+ if (virStrToLong_i(tmp, NULL, 16, &ischemata) < 0)
+ goto cleanup;
+
+ VIR_FREE(tmp);
+ tmp = NULL;
+ tmpitem->schemata = ischemata;
+ tmpitem ++;
+ schemata->n_schemata_items += 1;
+ }
+ p++;
+ }
+
+ schemata->schemata_items = schemataitems;
+ return schemata;
+
+ cleanup:
+ VIR_FREE(schemata);
+ VIR_FREE(tmpitem);
+ return NULL;
+}
+
+
static int virResCtrlReadConfig(virArch arch, int type)
{
int ret;
@@ -166,6 +338,495 @@ static int virResCtrlReadConfig(virArch arch, int type)
return ret;
}
+/* Remove the Domain from sysfs, this should only success no pids in tasks
+ * of a partition.
+ */
+static
+int virResCtrlRemoveDomain(const char *name)
+{
+ char *path = NULL;
+ int rc = 0;
+
+ if ((rc = virAsprintf(&path, "%s/%s", RESCTRL_DIR, name)) < 0)
+ return rc;
+ rc = rmdir(path);
+ VIR_FREE(path);
+ return rc;
+}
+
+static
+int virResCtrlDestroyDomain(virResDomainPtr p)
+{
+ size_t i;
+ int rc;
+ if ((rc = virResCtrlRemoveDomain(p->name)) < 0)
+ VIR_WARN("Failed to removed partition %s", p->name);
+
+ VIR_FREE(p->name);
+ p->name = NULL;
+ for (i = 0; i < p->n_tasks; i ++)
+ VIR_FREE(p->tasks[i]);
+ VIR_FREE(p);
+ p = NULL;
+ return rc;
+}
+
+
+/* assemble schemata string*/
+static
+char* virResCtrlAssembleSchemata(virResSchemataPtr schemata, int type)
+{
+ virBuffer buf = VIR_BUFFER_INITIALIZER;
+ size_t i;
+
+ virBufferAsprintf(&buf, "%s:%u=%x", resctrlall[type].name,
+ schemata->schemata_items[0].socket_no,
+ schemata->schemata_items[0].schemata);
+
+ for (i = 1; i < schemata->n_schemata_items; i++) {
+ virBufferAsprintf(&buf, ";%u=%x",
+ schemata->schemata_items[i].socket_no,
+ schemata->schemata_items[i].schemata);
+ }
+
+ return virBufferContentAndReset(&buf);
+}
+
+/* Refresh default domains' schemata
+ */
+static
+int virResCtrlRefreshSchemata(void)
+{
+ size_t i, j, k;
+ unsigned int tmp_schemata;
+ unsigned int default_schemata;
+
+ virResDomainPtr header, p;
+
+ header = domainall.domains;
+
+ if (!header)
+ return 0;
+
+ for (i = 0; i < VIR_RDT_RESOURCE_LAST; i++) {
+ if (VIR_RESCTRL_ENABLED(i)) {
+ for (j = 0; j < header->schematas[i]->n_schemata_items; j ++) {
+ p = header->next;
+ default_schemata = VIR_RESCTRL_GET_SCHEMATA(resctrlall[i].cbm_len);
+ tmp_schemata = 0;
+ /* NOTEs: if only header domain, the schemata will be set to default
one*/
+ for (k = 1; k < domainall.num_domains; k++) {
+ tmp_schemata |= p->schematas[i]->schemata_items[j].schemata;
+ p = p->next;
+ }
+ /* sys fs doens't let us use 0 */
+ int min_bits = VIR_RESCTRL_GET_SCHEMATA(resctrlall[i].min_cbm_bits);
+ if ((tmp_schemata & min_bits) == min_bits)
+ tmp_schemata -= min_bits;
+
+ default_schemata ^= tmp_schemata;
+
+ int bitsnum = virResCtrlBitsContinuesNum(default_schemata);
+ // calcuate header's schemata
+ // NOTES: resctrl sysfs only allow us to set a continues schemata
+ header->schematas[i]->schemata_items[j].schemata =
VIR_RESCTRL_GET_SCHEMATA(bitsnum);
+ resctrlall[i].cache_banks[j].cache_left =
+ (bitsnum - resctrlall[i].min_cbm_bits) *
resctrlall[i].cache_banks[j].cache_min;
+ }
+ }
+ }
+
+ return 0;
+
+}
+
+/* Get a domain ptr by domain's name*/
+static
+virResDomainPtr virResCtrlGetDomain(const char* name) {
+ size_t i;
+ virResDomainPtr p = domainall.domains;
+ for (i = 0; i < domainall.num_domains; i++) {
+ if ((p->name) && STREQ(name, p->name))
+ return p;
+ p = p->next;
+ }
+ return NULL;
+}
+
+static int
+virResCtrlAddTask(virResDomainPtr dom, pid_t pid)
+{
+ size_t maxtasks;
+
+ if (!dom->tasks) {
+ if (VIR_ALLOC_N(dom->tasks, 1) < 0)
+ return -1;
+ } else {
+ if (VIR_RESIZE_N(dom->tasks, maxtasks, dom->n_tasks, 1) < 0)
+ return -1;
+ }
+
+ if (virAsprintf(&(dom->tasks[dom->n_tasks]), "%llu", (long
long)pid) < 0)
+ return -1;
+
+ dom->n_tasks += 1;
+ return 0;
+}
+
+static int
+virResCtrlWrite(const char *name, const char *item, const char *content)
+{
+ char *path;
+ int writefd;
+ int rc = -1;
+
+ CONSTRUCT_RESCTRL_PATH(name, item);
+
+ if (!virFileExists(path))
+ goto cleanup;
+
+ if ((writefd = open(path, O_WRONLY | O_APPEND, S_IRUSR | S_IWUSR)) < 0)
+ goto cleanup;
+
+ if (safewrite(writefd, content, strlen(content)) < 0)
+ goto cleanup;
+
+ rc = 0;
+ cleanup:
+ VIR_FREE(path);
+ VIR_FORCE_CLOSE(writefd);
+ return rc;
+}
+
+/* if name == NULL we load default schemata */
+static
+virResDomainPtr virResCtrlLoadDomain(const char *name)
+{
+ char *schematas;
+ virResDomainPtr p;
+ size_t i;
+
+ if (VIR_ALLOC(p) < 0)
+ goto cleanup;
+
+ for (i = 0; i < VIR_RDT_RESOURCE_LAST; i++) {
+ if (VIR_RESCTRL_ENABLED(i)) {
+ if (virResCtrlGetSchemata(i, name, &schematas) < 0)
+ goto cleanup;
+ p->schematas[i] = virParseSchemata(schematas, &(p->n_sockets));
+ VIR_FREE(schematas);
+ }
+ }
+
+ p->tasks = NULL;
+ p->n_tasks = 0;
+
+ if ((name != NULL) && (VIR_STRDUP(p->name, name)) < 0)
+ goto cleanup;
+
+ return p;
+
+ cleanup:
+ VIR_FREE(p);
+ return NULL;
+}
+
+static
+virResDomainPtr virResCtrlCreateDomain(const char *name)
+{
+ char *path;
+ mode_t mode = 0755;
+ virResDomainPtr p;
+ size_t i, j;
+
+ if (virAsprintf(&path, "%s/%s", RESCTRL_DIR, name) < 0)
+ return NULL;
+
+ if (virDirCreate(path, mode, 0, 0, 0) < 0)
+ goto cleanup;
+
+ if ((p = virResCtrlLoadDomain(name)) == NULL)
+ return p;
+
+ /* sys fs doens't let us use 0.
+ * reset schemata to min_bits*/
+ for (i = 0; i < VIR_RDT_RESOURCE_LAST; i++) {
+ if (VIR_RESCTRL_ENABLED(i)) {
+ int min_bits = VIR_RESCTRL_GET_SCHEMATA(resctrlall[i].min_cbm_bits);
+ for (j = 0; j < p->n_sockets; j++)
+ p->schematas[i]->schemata_items[j].schemata = min_bits;
+ }
+ }
+
+ VIR_FREE(path);
+ return p;
+
+ cleanup:
+ VIR_FREE(path);
+ return NULL;
+}
+
+/* flush domains's information to sysfs*/
+static int
+virResCtrlFlushDomainToSysfs(virResDomainPtr dom)
+{
+ size_t i;
+ char* schemata;
+ char* tmp;
+ int rc = -1;
+ virBuffer buf = VIR_BUFFER_INITIALIZER;
+
+ for (i = 0; i < VIR_RDT_RESOURCE_LAST; i++) {
+ if (VIR_RESCTRL_ENABLED(i)) {
+ tmp = virResCtrlAssembleSchemata(dom->schematas[i], i);
+ virBufferAsprintf(&buf, "%s\n", tmp);
+ VIR_FREE(tmp);
+ }
+ }
+
+ schemata = virBufferContentAndReset(&buf);
+
+ if (virResCtrlWrite(dom->name, "schemata", schemata) < 0)
+ goto cleanup;
+
+ if (dom->n_tasks > 0) {
+ for (i = 0; i < dom->n_tasks; i++) {
+ if (virResCtrlWrite(dom->name, "tasks", dom->tasks[i]) <
0)
+ goto cleanup;
+ }
+ }
+
+ rc = 0;
+
+ cleanup:
+ VIR_FREE(schemata);
+ return rc;
+}
+
+static virResDomainPtr virResCtrlGetAllDomains(unsigned int *len)
+{
+ struct dirent *ent;
+ DIR *dp = NULL;
+ int direrr;
+
+ *len = 0;
+ virResDomainPtr header, tmp, tmp_pre;
+ header = tmp = tmp_pre = NULL;
+ if (virDirOpenQuiet(&dp, RESCTRL_DIR) < 0) {
+ if (errno == ENOENT)
+ return NULL;
+ VIR_ERROR(_("Unable to open %s (%d)"), RESCTRL_DIR, errno);
+ goto cleanup;
+ }
+
+ header = virResCtrlLoadDomain(NULL);
+ if (header == NULL)
+ goto cleanup;
+
+ header->next = NULL;
+
+ *len = 1;
+
+ while ((direrr = virDirRead(dp, &ent, NULL)) > 0) {
+ if ((ent->d_type != DT_DIR) || STREQ(ent->d_name, "info"))
+ continue;
+
+ tmp = virResCtrlLoadDomain(ent->d_name);
+ if (tmp == NULL)
+ goto cleanup;
+
+ tmp->next = NULL;
+
+ if (header->next == NULL)
+ header->next = tmp;
+
+ if (tmp_pre == NULL) {
+ tmp->pre = header;
+ } else {
+ tmp->pre = tmp_pre;
+ tmp_pre->next = tmp;
+ }
+
+ tmp_pre = tmp;
+ (*len) ++;
+ }
+ return header;
+
+ cleanup:
+ VIR_DIR_CLOSE(dp);
+ tmp_pre = tmp = header;
+ while (tmp) {
+ tmp_pre = tmp;
+ tmp = tmp->next;
+ VIR_FREE(tmp_pre);
+ }
+ return NULL;
+}
+
+static int
+virResCtrlAppendDomain(virResDomainPtr dom)
+{
+ virResDomainPtr p = domainall.domains;
+ while (p->next != NULL) p = p->next;
+ p->next = dom;
+ dom->pre = p;
+ domainall.num_domains += 1;
+ return 0;
+}
+
+static int
+virResCtrlGetSocketIdByHostID(int type, unsigned int hostid)
+{
+ size_t i;
+ for (i = 0; i < resctrlall[type].num_banks; i++) {
+ if (resctrlall[type].cache_banks[i].host_id == hostid)
+ return i;
+ }
+ return -1;
+}
+
+static int
+virResCtrlCalculateSchemata(int type,
+ int sid,
+ unsigned hostid,
+ unsigned long long size)
+{
+ size_t i;
+ int count;
+ virResDomainPtr p;
+ unsigned int tmp_schemata;
+ unsigned int schemata_sum = 0;
+
+ if (resctrlall[type].cache_banks[sid].cache_left < size) {
+ VIR_ERROR(_("Not enough cache left on bank %u"), hostid);
+ return -1;
+ }
+ if ((count = size / resctrlall[type].cache_banks[sid].cache_min) <= 0) {
+ VIR_ERROR(_("Error cache size %llu"), size);
+ return -1;
+ }
+
+ tmp_schemata = VIR_RESCTRL_GET_SCHEMATA(count);
+
+ p = domainall.domains;
+ p = p->next;
+ for (i = 1; i < domainall.num_domains; i ++) {
+ schemata_sum |= p->schematas[type]->schemata_items[sid].schemata;
+ p = p->next;
+ }
+
+ tmp_schemata = tmp_schemata << (resctrlall[type].cbm_len - count);
+
+ while ((tmp_schemata & schemata_sum) != 0)
+ tmp_schemata = tmp_schemata >> 1;
+ return tmp_schemata;
+}
+
+int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
+ unsigned char *uuid, pid_t *pids, int npid)
+{
+ size_t i;
+ char name[VIR_UUID_STRING_BUFLEN];
+ virResDomainPtr p;
+ int type;
+ int sid;
+ int schemata;
+
+ virUUIDFormat(uuid, name);
+
+ for (i = 0; i < cachetune->n_banks; i++) {
+ VIR_DEBUG("cache_banks %u, %u, %llu, %s",
+ cachetune->cache_banks[i].id,
+ cachetune->cache_banks[i].host_id,
+ cachetune->cache_banks[i].size,
+ cachetune->cache_banks[i].type);
+ }
+
+ if (cachetune->n_banks < 1)
+ return 0;
+
+ p = virResCtrlGetDomain(name);
+ if (p == NULL) {
+ VIR_DEBUG("no domain name %s found, create new one!", name);
+ p = virResCtrlCreateDomain(name);
+ }
+
+ if (p != NULL) {
+ for (i = 0; i < cachetune->n_banks; i++) {
+ if ((type = virResCtrlTypeFromString(
+ cachetune->cache_banks[i].type)) < 0) {
+ VIR_WARN("Ignore unknown cache type %s.",
+ cachetune->cache_banks[i].type);
+ continue;
+ }
+
+ if ((sid = virResCtrlGetSocketIdByHostID(
+ type, cachetune->cache_banks[i].host_id)) < 0) {
+ VIR_WARN("Can not find cache bank host id %u.",
+ cachetune->cache_banks[i].host_id);
+ continue;
+ }
+
+ if ((schemata = virResCtrlCalculateSchemata(
+ type, sid, cachetune->cache_banks[i].host_id,
+ cachetune->cache_banks[i].size)) < 0) {
+ VIR_WARN("Failed to set schemata for cache bank id %u",
+ cachetune->cache_banks[i].id);
+ continue;
+ }
+
+ p->schematas[type]->schemata_items[sid].schemata = schemata;
+ }
+
+ for (i = 0; i < npid; i++)
+ virResCtrlAddTask(p, pids[i]);
+
+ if (virResCtrlFlushDomainToSysfs(p) < 0) {
+ VIR_ERROR(_("failed to flush domain %s to sysfs"), name);
+ virResCtrlDestroyDomain(p);
+ return -1;
+ }
+ virResCtrlAppendDomain(p);
+ } else {
+ VIR_ERROR(_("Failed to create a domain in sysfs"));
+ return -1;
+ }
+
+ virResCtrlRefreshSchemata();
+ /* after refresh, flush header's schemata changes to sys fs */
+ if (virResCtrlFlushDomainToSysfs(domainall.domains) < 0)
+ VIR_WARN("failed to flush domain to sysfs");
+
+ return 0;
+}
+
+/* Should be called after pid disappeared, we recalculate
+ * schemata of default and flush it to sys fs.
+ */
+int virResCtrlUpdate(unsigned char *uuid)
+{
+ int rc = -1;
+ char name[VIR_UUID_STRING_BUFLEN];
+ virResDomainPtr del;
+
+ virUUIDFormat(uuid, name);
+
+ del = virResCtrlGetDomain(name);
+
+ if (del != NULL) {
+ del->pre->next = del->next;
+ if (del->next != NULL)
+ del->next->pre = del->pre;
+ virResCtrlDestroyDomain(del);
+ domainall.num_domains -= 1;
+ virResCtrlRefreshSchemata();
+ if ((rc = virResCtrlFlushDomainToSysfs(domainall.domains)) < 0)
+ VIR_WARN("failed to flush domain to sysfs");
+ }
+
+ return rc;
+}
+
int
virResCtrlInit(void)
{
@@ -194,6 +855,12 @@ virResCtrlInit(void)
VIR_FREE(tmp);
}
+ domainall.domains = virResCtrlGetAllDomains(&(domainall.num_domains));
+
+ if ((rc = virResCtrlRefreshSchemata()) < 0)
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Failed to refresh resource control"));
+
cleanup:
VIR_FREE(tmp);
return rc;
diff --git a/src/util/virresctrl.h b/src/util/virresctrl.h
index 074d307..63dc839 100644
--- a/src/util/virresctrl.h
+++ b/src/util/virresctrl.h
@@ -26,6 +26,7 @@
# include "virbitmap.h"
# include "virutil.h"
+# include "domain_conf.h"
enum {
VIR_RDT_RESOURCE_L3,
@@ -76,5 +77,7 @@ struct _virResCtrl {
bool virResCtrlAvailable(void);
int virResCtrlInit(void);
virResCtrlPtr virResCtrlGet(int);
-
+int virResCtrlSetCacheBanks(virDomainCachetunePtr,
+ unsigned char *, pid_t *, int);
+int virResCtrlUpdate(unsigned char *);
#endif
--
1.9.1
8:01 p.m.
New subject: [libvirt] [PATH v8 05/10] Qemu: Set cache tune while booting a new domain.
While user can assign some specific vcpus list in <cachetune>, adds the
vcpus' pids to cache bank, else vm->pid will be added to cache bank.
Signed-off-by: Eli Qiao <liyong.qiao(a)intel.com>
---
src/qemu/qemu_driver.c | 6 ++++--
src/qemu/qemu_process.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 58 insertions(+), 2 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 7995511..1e3ed1a 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -850,8 +850,10 @@ qemuStateInitialize(bool privileged,
run_gid = cfg->group;
}
- if (virResCtrlAvailable() && virResCtrlInit() < 0)
- VIR_WARN("Faild to initialize resource control.");
+ if (virResCtrlAvailable() && virResCtrlInit() < 0) {
+ VIR_ERROR(_("Faild to initialize resource control"));
+ goto error;
+ }
qemu_driver->qemuCapsCache = virQEMUCapsCacheNew(cfg->libDir,
cfg->cacheDir,
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 184440d..f3e1c4c 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -76,6 +76,7 @@
#include "configmake.h"
#include "nwfilter_conf.h"
#include "netdev_bandwidth_conf.h"
+#include "virresctrl.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
@@ -5021,6 +5022,50 @@ qemuProcessVcpusSortOrder(const void *a,
return vcpua->order - vcpub->order;
}
+static int
+qemuProcessSetCacheBanks(virDomainObjPtr vm)
+{
+ size_t i, j;
+ virDomainCachetunePtr cachetune;
+ unsigned int max_vcpus = virDomainDefGetVcpusMax(vm->def);
+ pid_t *pids = NULL;
+ virDomainVcpuDefPtr vcpu;
+ size_t npid = 0;
+ size_t count = 0;
+ int ret = -1;
+
+ cachetune = &(vm->def->cachetune);
+
+ for (i = 0; i < cachetune->n_banks; i++) {
+ if (cachetune->cache_banks[i].vcpus) {
+ for (j = 0; j < max_vcpus; j++) {
+ if (virBitmapIsBitSet(cachetune->cache_banks[i].vcpus, j)) {
+
+ vcpu = virDomainDefGetVcpu(vm->def, j);
+ if (!vcpu->online)
+ continue;
+
+ if (VIR_RESIZE_N(pids, npid, count, 1) < 0)
+ goto cleanup;
+ pids[count ++] = qemuDomainGetVcpuPid(vm, j);
+ }
+ }
+ }
+ }
+
+ /* If not specific vcpus in cachetune, add vm->pid */
+ if (pids == NULL) {
+ if (VIR_ALLOC_N(pids, 1) < 0)
+ goto cleanup;
+ pids[0] = vm->pid;
+ count = 1;
+ }
+ ret = virResCtrlSetCacheBanks(cachetune, vm->def->uuid, pids, count);
+
+ cleanup:
+ VIR_FREE(pids);
+ return ret;
+}
static int
qemuProcessSetupHotpluggableVcpus(virQEMUDriverPtr driver,
@@ -5714,6 +5759,11 @@ qemuProcessLaunch(virConnectPtr conn,
qemuProcessAutoDestroyAdd(driver, vm, conn) < 0)
goto cleanup;
+ VIR_DEBUG("Cache allocation");
+
+ if (virResCtrlAvailable() && qemuProcessSetCacheBanks(vm) < 0)
+ goto cleanup;
+
ret = 0;
cleanup:
@@ -6216,6 +6266,10 @@ void qemuProcessStop(virQEMUDriverPtr driver,
virPerfFree(priv->perf);
priv->perf = NULL;
+ if (virResCtrlAvailable() && virResCtrlUpdate(vm->def->uuid) < 0)
+ VIR_WARN("Failed to update resource control for %s",
+ vm->def->name);
+
qemuProcessRemoveDomainStatus(driver, vm);
/* Remove VNC and Spice ports from port reservation bitmap, but only if
--
1.9.1
8:01 p.m.
New subject: [libvirt] [PATH v8 06/10] Resctrl: enable l3code/l3data
Enable l3code/l3data while doing cache tune.
l3code/l3data should use a continus cbm in their seperated schemata and
the cache size are shared between them, so we need to deal them
differently with l3 cache.
This should enable cdp feature while mounting /sys/fs/resctrl, eg:
mount -t resctrl resctrl -o cdp /sys/fs/resctrl
Signed-off-by: Eli Qiao <liyong.qiao(a)intel.com>
---
docs/schemas/domaincommon.rng | 2 +-
src/util/virresctrl.c | 25 ++++++++++++++++++++++++-
2 files changed, 25 insertions(+), 2 deletions(-)
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index edb2888..f61c57a 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -5489,7 +5489,7 @@
</define>
<define name="cachetype">
<data type="string">
- <param name="pattern">(l3)</param>
+ <param name="pattern">(l3|l3code|l3data)</param>
</data>
</define>
<define name="cacheunit">
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index cb46e36..ba362e4 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -400,6 +400,7 @@ int virResCtrlRefreshSchemata(void)
size_t i, j, k;
unsigned int tmp_schemata;
unsigned int default_schemata;
+ int pair_type = 0;
virResDomainPtr header, p;
@@ -410,6 +411,12 @@ int virResCtrlRefreshSchemata(void)
for (i = 0; i < VIR_RDT_RESOURCE_LAST; i++) {
if (VIR_RESCTRL_ENABLED(i)) {
+
+ if (i == VIR_RDT_RESOURCE_L3DATA)
+ pair_type = VIR_RDT_RESOURCE_L3CODE;
+ if (i == VIR_RDT_RESOURCE_L3CODE)
+ pair_type = VIR_RDT_RESOURCE_L3DATA;
+
for (j = 0; j < header->schematas[i]->n_schemata_items; j ++) {
p = header->next;
default_schemata = VIR_RESCTRL_GET_SCHEMATA(resctrlall[i].cbm_len);
@@ -417,6 +424,8 @@ int virResCtrlRefreshSchemata(void)
/* NOTEs: if only header domain, the schemata will be set to default
one*/
for (k = 1; k < domainall.num_domains; k++) {
tmp_schemata |= p->schematas[i]->schemata_items[j].schemata;
+ if (pair_type > 0)
+ tmp_schemata |=
p->schematas[pair_type]->schemata_items[j].schemata;
p = p->next;
}
/* sys fs doens't let us use 0 */
@@ -492,6 +501,7 @@ virResCtrlWrite(const char *name, const char *item, const char
*content)
goto cleanup;
rc = 0;
+
cleanup:
VIR_FREE(path);
VIR_FORCE_CLOSE(writefd);
@@ -696,6 +706,7 @@ virResCtrlCalculateSchemata(int type,
virResDomainPtr p;
unsigned int tmp_schemata;
unsigned int schemata_sum = 0;
+ int pair_type = 0;
if (resctrlall[type].cache_banks[sid].cache_left < size) {
VIR_ERROR(_("Not enough cache left on bank %u"), hostid);
@@ -710,8 +721,18 @@ virResCtrlCalculateSchemata(int type,
p = domainall.domains;
p = p->next;
+
+ /* for type is l3code and l3data, we need to deal them specially*/
+ if (type == VIR_RDT_RESOURCE_L3DATA)
+ pair_type = VIR_RDT_RESOURCE_L3CODE;
+
+ if (type == VIR_RDT_RESOURCE_L3CODE)
+ pair_type = VIR_RDT_RESOURCE_L3DATA;
+
for (i = 1; i < domainall.num_domains; i ++) {
schemata_sum |= p->schematas[type]->schemata_items[sid].schemata;
+ if (pair_type > 0)
+ schemata_sum |= p->schematas[pair_type]->schemata_items[sid].schemata;
p = p->next;
}
@@ -752,6 +773,9 @@ int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
}
if (p != NULL) {
+
+ virResCtrlAppendDomain(p);
+
for (i = 0; i < cachetune->n_banks; i++) {
if ((type = virResCtrlTypeFromString(
cachetune->cache_banks[i].type)) < 0) {
@@ -786,7 +810,6 @@ int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
virResCtrlDestroyDomain(p);
return -1;
}
- virResCtrlAppendDomain(p);
} else {
VIR_ERROR(_("Failed to create a domain in sysfs"));
return -1;
--
1.9.1
8:01 p.m.
New subject: [libvirt] [PATH v8 07/10] Resctrl: Make sure l3data/l3code are pairs
l3data and l3code type of cache banks should be configured pairs.
Signed-off-by: Eli Qiao <liyong.qiao(a)intel.com>
---
src/conf/domain_conf.c | 19 +++++++++++++++++++
src/util/virresctrl.c | 1 -
src/util/virresctrl.h | 2 ++
3 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 430c451..8c340ea 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -15619,9 +15619,13 @@ virDomainCacheTuneDefParseXML(virDomainDefPtr def,
int type = -1;
virDomainCacheBankPtr bank = NULL;
virResCtrlPtr resctrl;
+ /* An array to make sure l3code and l3data are pairs */
+ int* sem = NULL;
if (VIR_ALLOC_N(bank, n) < 0)
goto cleanup;
+ if (VIR_ALLOC_N(sem, MAX_CPU_SOCKET_NUM) < 0)
+ goto cleanup;
for (i = 0; i < n; i++) {
if (!(tmp = virXMLPropString(nodes[i], "id"))) {
@@ -15669,6 +15673,12 @@ virDomainCacheTuneDefParseXML(virDomainDefPtr def,
goto cleanup;
}
+ /* VIR_RDT_RESOURCE_L3DATA and VIR_RDT_RESOURCE_L3CODE should be pair */
+ if (type == VIR_RDT_RESOURCE_L3DATA)
+ sem[bank[i].host_id] ++;
+ else if (type == VIR_RDT_RESOURCE_L3CODE)
+ sem[bank[i].host_id] --;
+
resctrl = virResCtrlGet(type);
if (resctrl == NULL || !resctrl->enabled) {
@@ -15717,6 +15727,14 @@ virDomainCacheTuneDefParseXML(virDomainDefPtr def,
}
}
+ for (i = 0; i < MAX_CPU_SOCKET_NUM; i ++) {
+ if (sem[i] != 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("'l3code and l3data shoud be show up pairs on bank
%zu'"),
+ i);
+ goto cleanup;
+ }
+ }
def->cachetune.cache_banks = bank;
def->cachetune.n_banks = n;
return 0;
@@ -15724,6 +15742,7 @@ virDomainCacheTuneDefParseXML(virDomainDefPtr def,
cleanup:
VIR_FREE(bank);
VIR_FREE(tmp);
+ VIR_FREE(sem);
return -1;
}
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index ba362e4..3a7912b 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -35,7 +35,6 @@
VIR_LOG_INIT("util.resctrl");
#define VIR_FROM_THIS VIR_FROM_RESCTRL
-#define MAX_CPU_SOCKET_NUM 8
#define MAX_CBM_BIT_LEN 32
#define MAX_SCHEMATA_LEN 1024
#define MAX_FILE_LEN (10 * 1024 * 1024)
diff --git a/src/util/virresctrl.h b/src/util/virresctrl.h
index 63dc839..bd90853 100644
--- a/src/util/virresctrl.h
+++ b/src/util/virresctrl.h
@@ -28,6 +28,8 @@
# include "virutil.h"
# include "domain_conf.h"
+#define MAX_CPU_SOCKET_NUM 8
+
enum {
VIR_RDT_RESOURCE_L3,
VIR_RDT_RESOURCE_L3DATA,
--
1.9.1
8:01 p.m.
New subject: [libvirt] [PATH v8 08/10] Resctrl: Compatible mode for cdp enabled
This patch support l3 cache allocation compatible mode if cdp enabled
on host.
In this case l3code/l3data has same schemata.
Signed-off-by: Eli Qiao <liyong.qiao(a)intel.com>
---
src/conf/domain_conf.c | 15 +++++++++++++--
src/util/virresctrl.c | 10 ++++++++++
2 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 8c340ea..81724d2 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -15682,9 +15682,20 @@ virDomainCacheTuneDefParseXML(virDomainDefPtr def,
resctrl = virResCtrlGet(type);
if (resctrl == NULL || !resctrl->enabled) {
- virReportError(VIR_ERR_XML_ERROR,
+ /* support cdp compatible */
+ if (type == VIR_RDT_RESOURCE_L3) {
+ resctrl = virResCtrlGet(type + 1);
+ if (resctrl == NULL || !resctrl->enabled) {
+ virReportError(VIR_ERR_XML_ERROR,
_("'host doesn't enabled cache type '%s'"),
tmp);
- goto cleanup;
+ goto cleanup;
+ }
+ VIR_WARN("Use cdp compatible mode.");
+ } else {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("'host doesn't enabled cache type
'%s'"), tmp);
+ goto cleanup;
+ }
}
bool found_host_id = false;
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index 3a7912b..99f3add 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -749,6 +749,7 @@ int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
char name[VIR_UUID_STRING_BUFLEN];
virResDomainPtr p;
int type;
+ int pair_type = -1;
int sid;
int schemata;
@@ -782,6 +783,13 @@ int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
cachetune->cache_banks[i].type);
continue;
}
+ /* use cdp compatible mode */
+ if (!VIR_RESCTRL_ENABLED(type) &&
+ (type == VIR_RDT_RESOURCE_L3) &&
+ VIR_RESCTRL_ENABLED(VIR_RDT_RESOURCE_L3DATA)) {
+ type = VIR_RDT_RESOURCE_L3DATA;
+ pair_type = VIR_RDT_RESOURCE_L3CODE;
+ }
if ((sid = virResCtrlGetSocketIdByHostID(
type, cachetune->cache_banks[i].host_id)) < 0) {
@@ -799,6 +807,8 @@ int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
}
p->schematas[type]->schemata_items[sid].schemata = schemata;
+ if (pair_type > 0)
+ p->schematas[pair_type]->schemata_items[sid].schemata = schemata;
}
for (i = 0; i < npid; i++)
--
1.9.1
8:01 p.m.
New subject: [libvirt] [PATH v8 09/10] Resctrl: concurrence support
The internal struct list domainall is a list which are resctral domain
status shared by all VMs, especiall the default domain, each VM should
access it concomitantly. Ues a mutex to control it.
Each bank's cache_left field is also a global shared resource we need
to be care, add a mutex for each bank.
We need also to add lock to access /sys/fs/resctrl, use flock.
Signed-off-by: Eli Qiao <liyong.qiao(a)intel.com>
---
src/util/virresctrl.c | 93 ++++++++++++++++++++++++++++++++++++++++++++-------
src/util/virresctrl.h | 3 ++
2 files changed, 83 insertions(+), 13 deletions(-)
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index 99f3add..1e2c00e 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -20,7 +20,9 @@
*/
#include <config.h>
#include <fcntl.h>
+#include <sys/file.h>
#include <sys/stat.h>
+#include <sys/types.h>
#include "virresctrl.h"
#include "viralloc.h"
@@ -63,6 +65,9 @@ do { \
#define VIR_RESCTRL_GET_SCHEMATA(count) ((1 << count) - 1)
+#define VIR_RESCTRL_LOCK(fd, op) flock(fd, op)
+#define VIR_RESCTRL_UNLOCK(fd) flock(fd, LOCK_UN)
+
/**
* a virResSchemata represents a schemata object under a resource control
* domain.
@@ -106,6 +111,8 @@ typedef virResCtrlDomain *virResCtrlDomainPtr;
struct _virResCtrlDomain {
unsigned int num_domains;
virResDomainPtr domains;
+
+ virMutex lock;
};
static unsigned int host_id;
@@ -160,11 +167,16 @@ static int virResCtrlGetStr(const char *domain_name, const char
*item_name, char
CONSTRUCT_RESCTRL_PATH(domain_name, item_name);
+ if (!virFileExists(path))
+ goto cleanup;
+
if (virFileReadAll(path, MAX_FILE_LEN, ret) < 0) {
rc = -1;
goto cleanup;
}
+ rc = 0;
+
cleanup:
VIR_FREE(path);
return rc;
@@ -676,10 +688,15 @@ static int
virResCtrlAppendDomain(virResDomainPtr dom)
{
virResDomainPtr p = domainall.domains;
+
+ virMutexLock(&domainall.lock);
+
while (p->next != NULL) p = p->next;
p->next = dom;
dom->pre = p;
domainall.num_domains += 1;
+
+ virMutexUnlock(&domainall.lock);
return 0;
}
@@ -702,18 +719,22 @@ virResCtrlCalculateSchemata(int type,
{
size_t i;
int count;
+ int rc = -1;
virResDomainPtr p;
unsigned int tmp_schemata;
unsigned int schemata_sum = 0;
int pair_type = 0;
+ virMutexLock(&resctrlall[type].cache_banks[sid].lock);
+
if (resctrlall[type].cache_banks[sid].cache_left < size) {
VIR_ERROR(_("Not enough cache left on bank %u"), hostid);
- return -1;
+ goto cleanup;
}
+
if ((count = size / resctrlall[type].cache_banks[sid].cache_min) <= 0) {
VIR_ERROR(_("Error cache size %llu"), size);
- return -1;
+ goto cleanup;
}
tmp_schemata = VIR_RESCTRL_GET_SCHEMATA(count);
@@ -728,7 +749,7 @@ virResCtrlCalculateSchemata(int type,
if (type == VIR_RDT_RESOURCE_L3CODE)
pair_type = VIR_RDT_RESOURCE_L3DATA;
- for (i = 1; i < domainall.num_domains; i ++) {
+ for (i = 1; i < domainall.num_domains; i++) {
schemata_sum |= p->schematas[type]->schemata_items[sid].schemata;
if (pair_type > 0)
schemata_sum |= p->schematas[pair_type]->schemata_items[sid].schemata;
@@ -739,7 +760,16 @@ virResCtrlCalculateSchemata(int type,
while ((tmp_schemata & schemata_sum) != 0)
tmp_schemata = tmp_schemata >> 1;
- return tmp_schemata;
+
+ resctrlall[type].cache_banks[sid].cache_left -= size;
+ if (pair_type > 0)
+ resctrlall[pair_type].cache_banks[sid].cache_left =
resctrlall[type].cache_banks[sid].cache_left;
+
+ rc = tmp_schemata;
+
+ cleanup:
+ virMutexUnlock(&resctrlall[type].cache_banks[sid].lock);
+ return rc;
}
int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
@@ -752,8 +782,8 @@ int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
int pair_type = -1;
int sid;
int schemata;
-
- virUUIDFormat(uuid, name);
+ int lockfd;
+ int rc = -1;
for (i = 0; i < cachetune->n_banks; i++) {
VIR_DEBUG("cache_banks %u, %u, %llu, %s",
@@ -766,12 +796,21 @@ int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
if (cachetune->n_banks < 1)
return 0;
+ virUUIDFormat(uuid, name);
+
+ if ((lockfd = open(RESCTRL_DIR, O_RDONLY)) < 0)
+ goto cleanup;
+
+ if (VIR_RESCTRL_LOCK(lockfd, LOCK_EX) < 0) {
+ virReportSystemError(errno, _("Unable to lock '%s'"),
RESCTRL_DIR);
+ goto cleanup;
+ }
+
p = virResCtrlGetDomain(name);
if (p == NULL) {
VIR_DEBUG("no domain name %s found, create new one!", name);
p = virResCtrlCreateDomain(name);
}
-
if (p != NULL) {
virResCtrlAppendDomain(p);
@@ -817,19 +856,25 @@ int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
if (virResCtrlFlushDomainToSysfs(p) < 0) {
VIR_ERROR(_("failed to flush domain %s to sysfs"), name);
virResCtrlDestroyDomain(p);
- return -1;
+ goto cleanup;
}
} else {
VIR_ERROR(_("Failed to create a domain in sysfs"));
- return -1;
+ goto cleanup;
}
virResCtrlRefreshSchemata();
/* after refresh, flush header's schemata changes to sys fs */
- if (virResCtrlFlushDomainToSysfs(domainall.domains) < 0)
- VIR_WARN("failed to flush domain to sysfs");
+ if (virResCtrlFlushDomainToSysfs(domainall.domains) < 0) {
+ VIR_ERROR(_("failed to flush domain to sysfs"));
+ goto cleanup;
+ }
- return 0;
+ rc = 0;
+
+ cleanup:
+ VIR_RESCTRL_UNLOCK(lockfd);
+ return rc;
}
/* Should be called after pid disappeared, we recalculate
@@ -846,6 +891,9 @@ int virResCtrlUpdate(unsigned char *uuid)
del = virResCtrlGetDomain(name);
if (del != NULL) {
+
+ virMutexLock(&domainall.lock);
+
del->pre->next = del->next;
if (del->next != NULL)
del->next->pre = del->pre;
@@ -854,6 +902,7 @@ int virResCtrlUpdate(unsigned char *uuid)
virResCtrlRefreshSchemata();
if ((rc = virResCtrlFlushDomainToSysfs(domainall.domains)) < 0)
VIR_WARN("failed to flush domain to sysfs");
+ virMutexUnlock(&domainall.lock);
}
return rc;
@@ -862,7 +911,7 @@ int virResCtrlUpdate(unsigned char *uuid)
int
virResCtrlInit(void)
{
- size_t i = 0;
+ size_t i, j;
char *tmp;
int rc = 0;
@@ -889,6 +938,24 @@ virResCtrlInit(void)
domainall.domains = virResCtrlGetAllDomains(&(domainall.num_domains));
+ for (i = 0; i < VIR_RDT_RESOURCE_LAST; i++) {
+ if (VIR_RESCTRL_ENABLED(i)) {
+ for (j = 0; j < resctrlall[i].num_banks; j++) {
+ if (virMutexInit(&resctrlall[i].cache_banks[j].lock) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Unable to initialize mutex"));
+ return -1;
+ }
+ }
+ }
+ }
+
+ if (virMutexInit(&domainall.lock) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Unable to initialize mutex"));
+ return -1;
+ }
+
if ((rc = virResCtrlRefreshSchemata()) < 0)
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Failed to refresh resource control"));
diff --git a/src/util/virresctrl.h b/src/util/virresctrl.h
index bd90853..303d915 100644
--- a/src/util/virresctrl.h
+++ b/src/util/virresctrl.h
@@ -27,6 +27,7 @@
# include "virbitmap.h"
# include "virutil.h"
# include "domain_conf.h"
+# include "virthread.h"
#define MAX_CPU_SOCKET_NUM 8
@@ -49,6 +50,8 @@ struct _virResCacheBank {
unsigned long long cache_left;
unsigned long long cache_min;
virBitmapPtr cpu_mask;
+
+ virMutex lock;
};
/**
--
1.9.1
8:01 p.m.
New subject: [libvirt] [PATH v8 10/10] Resctrl: Scan resctrl before doing cache allocation
Other application may touch resctrl while libvirt's running, scan
resctrl again before allocating cache information to the newly created
VM.
Signed-off-by: Eli Qiao <liyong.qiao(a)intel.com>
---
src/util/virresctrl.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index 1e2c00e..a245f09 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -700,6 +700,42 @@ virResCtrlAppendDomain(virResDomainPtr dom)
return 0;
}
+/* scan /sys/fs/resctrl again and refresh default schemata */
+static
+int virResCtrlScan(void)
+{
+ struct dirent *ent;
+ DIR *dp = NULL;
+ int direrr;
+ virResDomainPtr p;
+ int rc = -1;
+
+ if (virDirOpenQuiet(&dp, RESCTRL_DIR) < 0) {
+ if (errno == ENOENT)
+ return -1;
+ VIR_ERROR(_("Unable to open %s (%d)"), RESCTRL_DIR, errno);
+ goto cleanup;
+ }
+
+ while ((direrr = virDirRead(dp, &ent, NULL)) > 0) {
+ if ((ent->d_type != DT_DIR) || STREQ(ent->d_name, "info"))
+ continue;
+ /* test if we'v tracked all domains */
+ p = virResCtrlGetDomain(ent->d_name);
+ if (p == NULL) {
+ p = virResCtrlLoadDomain(ent->d_name);
+ if (p == NULL)
+ continue;
+ virResCtrlAppendDomain(p);
+ }
+ }
+ rc = 0;
+
+ cleanup:
+ VIR_DIR_CLOSE(dp);
+ return rc;
+}
+
static int
virResCtrlGetSocketIdByHostID(int type, unsigned int hostid)
{
@@ -806,6 +842,10 @@ int virResCtrlSetCacheBanks(virDomainCachetunePtr cachetune,
goto cleanup;
}
+ if (virResCtrlScan() < 0) {
+ VIR_ERROR(_("Failed to scan resctrl domain dir"));
+ return -1;
+ }
p = virResCtrlGetDomain(name);
if (p == NULL) {
VIR_DEBUG("no domain name %s found, create new one!", name);
--
1.9.1
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Eli Qiao