1:35 p.m.
As requested in review.
Peter Krempa (2):
qemu: monitor: Remove unused qemuMonitorMigrateToFile
qemu: Remove unnecessary calculations in qemuDomainSaveMemory
src/qemu/qemu_driver.c | 30 ++----------------------
src/qemu/qemu_monitor.c | 61 -------------------------------------------------
src/qemu/qemu_monitor.h | 17 --------------
3 files changed, 2 insertions(+), 106 deletions(-)
--
2.6.2
1:35 p.m.
New subject: [libvirt] [PATCH 1/2] qemu: monitor: Remove unused qemuMonitorMigrateToFile
With the currently supported qemus we always migrate to file
descriptors so the old function is not required any more.
Additionally QEMU_MONITOR_MIGRATE_TO_FILE_TRANSFER_SIZE macro is now
unused.
---
src/qemu/qemu_monitor.c | 61 -------------------------------------------------
src/qemu/qemu_monitor.h | 7 ------
2 files changed, 68 deletions(-)
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index 6b23e88..58a7475 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -2213,67 +2213,6 @@ qemuMonitorMigrateToCommand(qemuMonitorPtr mon,
int
-qemuMonitorMigrateToFile(qemuMonitorPtr mon,
- unsigned int flags,
- const char * const *argv,
- const char *target,
- unsigned long long offset)
-{
- char *argstr;
- char *dest = NULL;
- int ret = -1;
- char *safe_target = NULL;
- virBuffer buf = VIR_BUFFER_INITIALIZER;
- VIR_DEBUG("argv=%p target=%s offset=%llu flags=%x",
- argv, target, offset, flags);
-
- QEMU_CHECK_MONITOR(mon);
-
- if (offset % QEMU_MONITOR_MIGRATE_TO_FILE_BS) {
- virReportError(VIR_ERR_INTERNAL_ERROR,
- _("file offset must be a multiple of %llu"),
- QEMU_MONITOR_MIGRATE_TO_FILE_BS);
- return -1;
- }
-
- argstr = virArgvToString(argv);
- if (!argstr)
- goto cleanup;
-
- /* Migrate to file */
- virBufferEscapeShell(&buf, target);
- if (virBufferCheckError(&buf) < 0)
- goto cleanup;
- safe_target = virBufferContentAndReset(&buf);
-
- /* Two dd processes, sharing the same stdout, are necessary to
- * allow starting at an alignment of 512, but without wasting
- * padding to get to the larger alignment useful for speed. Use
- * <> redirection to avoid truncating a regular file. */
- if (virAsprintf(&dest, "exec:" VIR_WRAPPER_SHELL_PREFIX "%s |
"
- "{ dd bs=%llu seek=%llu if=/dev/null && "
- "dd ibs=%llu obs=%llu; } 1<>%s"
VIR_WRAPPER_SHELL_SUFFIX,
- argstr, QEMU_MONITOR_MIGRATE_TO_FILE_BS,
- offset / QEMU_MONITOR_MIGRATE_TO_FILE_BS,
- QEMU_MONITOR_MIGRATE_TO_FILE_TRANSFER_SIZE,
- QEMU_MONITOR_MIGRATE_TO_FILE_TRANSFER_SIZE,
- safe_target) < 0)
- goto cleanup;
-
- if (mon->json)
- ret = qemuMonitorJSONMigrate(mon, flags, dest);
- else
- ret = qemuMonitorTextMigrate(mon, flags, dest);
-
- cleanup:
- VIR_FREE(safe_target);
- VIR_FREE(argstr);
- VIR_FREE(dest);
- return ret;
-}
-
-
-int
qemuMonitorMigrateToUnix(qemuMonitorPtr mon,
unsigned int flags,
const char *unixfile)
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index 9d7d5f3..d731344 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -569,13 +569,6 @@ int qemuMonitorMigrateToCommand(qemuMonitorPtr mon,
* larger but only aligned to the smaller block size.
*/
# define QEMU_MONITOR_MIGRATE_TO_FILE_BS (1024llu * 4)
-# define QEMU_MONITOR_MIGRATE_TO_FILE_TRANSFER_SIZE (1024llu * 1024)
-
-int qemuMonitorMigrateToFile(qemuMonitorPtr mon,
- unsigned int flags,
- const char * const *argv,
- const char *target,
- unsigned long long offset);
int qemuMonitorMigrateToUnix(qemuMonitorPtr mon,
unsigned int flags,
--
2.6.2
1:35 p.m.
New subject: [libvirt] [PATCH 2/2] qemu: Remove unnecessary calculations in qemuDomainSaveMemory
Now that the file migration doesn't require us to use 'dd' and other
legacy stuff for too old qemus we don't even have to calcuate the
offsets and other stuff.
---
src/qemu/qemu_driver.c | 30 ++----------------------------
src/qemu/qemu_monitor.h | 10 ----------
2 files changed, 2 insertions(+), 38 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 77f4baa..2ca6700 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -3128,38 +3128,13 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
int directFlag = 0;
virFileWrapperFdPtr wrapperFd = NULL;
unsigned int wrapperFlags = VIR_FILE_WRAPPER_NON_BLOCKING;
- unsigned long long pad;
- unsigned long long offset;
- size_t len;
- char *xml = NULL;
memset(&header, 0, sizeof(header));
memcpy(header.magic, QEMU_SAVE_PARTIAL, sizeof(header.magic));
header.version = QEMU_SAVE_VERSION;
header.was_running = was_running ? 1 : 0;
-
header.compressed = compressed;
-
- len = strlen(domXML) + 1;
- offset = sizeof(header) + len;
-
- /* Due to way we append QEMU state on our header with dd,
- * we need to ensure there's a 512 byte boundary. Unfortunately
- * we don't have an explicit offset in the header, so we fake
- * it by padding the XML string with NUL bytes. Additionally,
- * we want to ensure that virDomainSaveImageDefineXML can supply
- * slightly larger XML, so we add a minimum padding prior to
- * rounding out to page boundaries.
- */
- pad = 1024;
- pad += (QEMU_MONITOR_MIGRATE_TO_FILE_BS -
- ((offset + pad) % QEMU_MONITOR_MIGRATE_TO_FILE_BS));
- if (VIR_ALLOC_N(xml, len + pad) < 0)
- goto cleanup;
- strcpy(xml, domXML);
-
- offset += pad;
- header.xml_len = len;
+ header.xml_len = strlen(domXML) + 1;
/* Obtain the file handle. */
if ((flags & VIR_DOMAIN_SAVE_BYPASS_CACHE)) {
@@ -3184,7 +3159,7 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
goto cleanup;
/* Write header to file, followed by XML */
- if (qemuDomainSaveHeader(fd, path, xml, &header) < 0)
+ if (qemuDomainSaveHeader(fd, path, domXML, &header) < 0)
goto cleanup;
/* Perform the migration */
@@ -3226,7 +3201,6 @@ qemuDomainSaveMemory(virQEMUDriverPtr driver,
cleanup:
VIR_FORCE_CLOSE(fd);
virFileWrapperFdFree(wrapperFd);
- VIR_FREE(xml);
if (ret < 0 && needUnlink)
unlink(path);
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index d731344..134cbb6 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -560,16 +560,6 @@ int qemuMonitorMigrateToCommand(qemuMonitorPtr mon,
unsigned int flags,
const char * const *argv);
-/* In general, BS is the smallest fundamental block size we can use to
- * access a block device; everything must be aligned to a multiple of
- * this. Linux generally supports a BS as small as 512, but with
- * newer disks with 4k sectors, performance is better if we guarantee
- * alignment to the sector size. However, operating on BS-sized
- * blocks is painfully slow, so we also have a transfer size that is
- * larger but only aligned to the smaller block size.
- */
-# define QEMU_MONITOR_MIGRATE_TO_FILE_BS (1024llu * 4)
-
int qemuMonitorMigrateToUnix(qemuMonitorPtr mon,
unsigned int flags,
const char *unixfile);
--
2.6.2
2:13 p.m.
On Wed, Feb 17, 2016 at 01:35:50PM +0100, Peter Krempa wrote:
As requested in review.
Peter Krempa (2):
qemu: monitor: Remove unused qemuMonitorMigrateToFile
qemu: Remove unnecessary calculations in qemuDomainSaveMemory
ACK series
Patch 1/2 also removes the last use of VIR_WRAPPER_SHELL* macros from
qemu_monitor.h. The whole lv_wrapper_shell in configure.ac can also
be removed.
Jan
src/qemu/qemu_driver.c | 30 ++----------------------
src/qemu/qemu_monitor.c | 61 -------------------------------------------------
src/qemu/qemu_monitor.h | 17 --------------
3 files changed, 2 insertions(+), 106 deletions(-)
--
2.6.2
--
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3 comments
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participants (2)
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Ján Tomko -
Peter Krempa