Daniel P. Berrange wrote:
On Sun, Jan 23, 2011 at 02:19:44PM +0800, Gui Jianfeng wrote:
Implement blkio tunable XML configuration and parsing.
Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com> --- src/conf/domain_conf.c | 17 ++++++++++++++++- src/conf/domain_conf.h | 4 ++++ src/qemu/qemu_cgroup.c | 16 +++++++++++++++- src/qemu/qemu_conf.c | 3 ++- 4 files changed, 37 insertions(+), 3 deletions(-)
This needs to also update docs/schemas/domain.rng and ideally add a new test case + example datafile for tests/qemuxml2xmltest.c
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 645767e..a05ada5 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -4810,7 +4810,7 @@ static virDomainDefPtr virDomainDefParseXML(virCapsPtr caps, { xmlNodePtr *nodes = NULL, node = NULL; char *tmp = NULL; - int i, n; + int i, n, w; long id = -1; virDomainDefPtr def; unsigned long count; @@ -4887,6 +4887,13 @@ static virDomainDefPtr virDomainDefParseXML(virCapsPtr caps, if (node) def->mem.hugepage_backed = 1;
+ /* Extract blkio cgroup tunables */ + w = virXPathULong("string(./blkiotune/weight)", ctxt, + &def->blkio.weight); + if (w < 0 || def->blkio.weight > 1000 || def->blkio.weight < 100) + virDomainReportError(VIR_ERR_XML_ERROR, "%s", + _("I/O weight should fall in [100, 1000]")); +
The virDomainDefParseXML method should only do syntax validation. Semantic validation should be left to the hypervisor drivers.
/* Extract other memory tunables */ if (virXPathULong("string(./memtune/hard_limit)", ctxt, &def->mem.hard_limit) < 0) @@ -7289,6 +7296,14 @@ char *virDomainDefFormat(virDomainDefPtr def, virBufferVSprintf(&buf, " <currentMemory>%lu</currentMemory>\n", def->mem.cur_balloon);
+ /* add blkiotune only if there are any */ + if (def->blkio.weight) { + virBufferVSprintf(&buf, " <blkiotune>\n"); + virBufferVSprintf(&buf, " <weight>%lu</weight>\n", + def->blkio.weight); + virBufferVSprintf(&buf, " </blkiotune>\n"); + } + /* add memtune only if there are any */ if (def->mem.hard_limit || def->mem.soft_limit || def->mem.min_guarantee || def->mem.swap_hard_limit) diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index cf7bdc0..b117869 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -969,6 +969,10 @@ struct _virDomainDef { char *description;
struct { + unsigned long weight; + } blkio; + + struct { unsigned long max_balloon; unsigned long cur_balloon; unsigned long hugepage_backed; diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c index e5536c0..a3e8e6a 100644 --- a/src/qemu/qemu_cgroup.c +++ b/src/qemu/qemu_cgroup.c @@ -54,7 +54,6 @@ int qemuCgroupControllerActive(struct qemud_driver *driver, return 0; }
- int qemuSetupDiskPathAllow(virDomainDiskDefPtr disk ATTRIBUTE_UNUSED, const char *path, size_t depth ATTRIBUTE_UNUSED, @@ -270,6 +269,21 @@ int qemuSetupCgroup(struct qemud_driver *driver, } }
+ if (qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_BLKIO)) { + if (vm->def->blkio.weight != 0) { + rc = virCgroupSetWeight(cgroup, vm->def->blkio.weight); + if(rc != 0) { + virReportSystemError(-rc, + _("Unable to set io weight for domain %s"), + vm->def->name); + goto cleanup; + } + } + } else { + VIR_WARN("Blkio cgroup is disabled in qemu configuration file: %s", + vm->def->name); + }
I think it is probably worth raising a real error here
qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, _("Block I/O tuning is not available on this host"));
Ok, Will change. Thanks, Gui
Regards, Daniel
-- Regards Gui Jianfeng