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libvirt support to force convergence of live guest migration

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Busy enterprise workloads hosted on large sized VM's tend to dirty
memory faster than the transfer rate achieved via live guest migration.
Despite some good recent improvements (& using dedicated 10Gig NICs
between hosts) the live migration may NOT converge.

Recently support was added in qemu (version 1.6) to allow a user to
choose if they wish to force convergence of their migration via a
new migration capability : "auto-converge". This feature allows for qemu
to auto-detect lack of convergence and trigger a throttle-down of the
VCPUs.

This patch includes the libvirt support needed to trigger this
feature. (Testing is in progress)

Signed-off-by:  Chegu Vinod <chegu_vinod@hp.com>
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
Chegu Vinod 2014-02-06 15:44:36 -08:00 committed by Jiri Denemark
parent bfb29654c8
commit 05e1b06ab7
7 changed files with 62 additions and 7 deletions
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1
include/libvirt/libvirt.h.in
View File

@ -1200,6 +1200,7 @@ typedef enum {
VIR_MIGRATE_OFFLINE = (1 << 10), /* offline migrate */
VIR_MIGRATE_COMPRESSED = (1 << 11), /* compress data during migration */
VIR_MIGRATE_ABORT_ON_ERROR = (1 << 12), /* abort migration on I/O errors happened during migration */
VIR_MIGRATE_AUTO_CONVERGE = (1 << 13), /* force convergence */
} virDomainMigrateFlags;

9
src/libvirt.c
View File

@ -4408,7 +4408,8 @@ virDomainMigrateVersion1(virDomainPtr domain,
if (ret == 0 && info.state == VIR_DOMAIN_PAUSED)
flags |= VIR_MIGRATE_PAUSED;
destflags = flags & ~VIR_MIGRATE_ABORT_ON_ERROR;
destflags = flags & ~(VIR_MIGRATE_ABORT_ON_ERROR |
VIR_MIGRATE_AUTO_CONVERGE);
/* Prepare the migration.
*
@ -4538,7 +4539,8 @@ virDomainMigrateVersion2(virDomainPtr domain,
if (ret == 0 && info.state == VIR_DOMAIN_PAUSED)
flags |= VIR_MIGRATE_PAUSED;
destflags = flags & ~VIR_MIGRATE_ABORT_ON_ERROR;
destflags = flags & ~(VIR_MIGRATE_ABORT_ON_ERROR |
VIR_MIGRATE_AUTO_CONVERGE);
VIR_DEBUG("Prepare2 %p flags=%lx", dconn, destflags);
ret = dconn->driver->domainMigratePrepare2
@ -4710,7 +4712,8 @@ virDomainMigrateVersion3Full(virDomainPtr domain,
if (ret == 0 && state == VIR_DOMAIN_PAUSED)
flags |= VIR_MIGRATE_PAUSED;
destflags = flags & ~VIR_MIGRATE_ABORT_ON_ERROR;
destflags = flags & ~(VIR_MIGRATE_ABORT_ON_ERROR |
VIR_MIGRATE_AUTO_CONVERGE);
VIR_DEBUG("Prepare3 %p flags=%x", dconn, destflags);
cookiein = cookieout;

46
src/qemu/qemu_migration.c
View File

@ -1621,6 +1621,41 @@ cleanup:
return ret;
}
static int
qemuMigrationSetAutoConverge(virQEMUDriverPtr driver,
virDomainObjPtr vm,
enum qemuDomainAsyncJob job)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int ret;
if (qemuDomainObjEnterMonitorAsync(driver, vm, job) < 0)
return -1;
ret = qemuMonitorGetMigrationCapability(
priv->mon,
QEMU_MONITOR_MIGRATION_CAPS_AUTO_CONVERGE);
if (ret < 0) {
goto cleanup;
} else if (ret == 0) {
virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
_("Auto-Converge is not supported by "
"QEMU binary"));
ret = -1;
goto cleanup;
}
ret = qemuMonitorSetMigrationCapability(
priv->mon,
QEMU_MONITOR_MIGRATION_CAPS_AUTO_CONVERGE);
cleanup:
qemuDomainObjExitMonitor(driver, vm);
return ret;
}
static int
qemuMigrationWaitForSpice(virQEMUDriverPtr driver,
virDomainObjPtr vm)
@ -3234,6 +3269,11 @@ qemuMigrationRun(virQEMUDriverPtr driver,
QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
goto cleanup;
if (flags & VIR_MIGRATE_AUTO_CONVERGE &&
qemuMigrationSetAutoConverge(driver, vm,
QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
goto cleanup;
if (qemuDomainObjEnterMonitorAsync(driver, vm,
QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
goto cleanup;
@ -3587,7 +3627,8 @@ static int doPeer2PeerMigrate2(virQEMUDriverPtr driver,
if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_PAUSED)
flags |= VIR_MIGRATE_PAUSED;
destflags = flags & ~VIR_MIGRATE_ABORT_ON_ERROR;
destflags = flags & ~(VIR_MIGRATE_ABORT_ON_ERROR |
VIR_MIGRATE_AUTO_CONVERGE);
VIR_DEBUG("Prepare2 %p", dconn);
if (flags & VIR_MIGRATE_TUNNELLED) {
@ -3780,7 +3821,8 @@ doPeer2PeerMigrate3(virQEMUDriverPtr driver,
if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_PAUSED)
flags |= VIR_MIGRATE_PAUSED;
destflags = flags & ~VIR_MIGRATE_ABORT_ON_ERROR;
destflags = flags & ~(VIR_MIGRATE_ABORT_ON_ERROR |
VIR_MIGRATE_AUTO_CONVERGE);
VIR_DEBUG("Prepare3 %p", dconn);
cookiein = cookieout;

3
src/qemu/qemu_migration.h
View File

@ -39,7 +39,8 @@
VIR_MIGRATE_UNSAFE | \
VIR_MIGRATE_OFFLINE | \
VIR_MIGRATE_COMPRESSED | \
VIR_MIGRATE_ABORT_ON_ERROR)
VIR_MIGRATE_ABORT_ON_ERROR | \
VIR_MIGRATE_AUTO_CONVERGE)
/* All supported migration parameters and their types. */
# define QEMU_MIGRATION_PARAMETERS \

2
src/qemu/qemu_monitor.c
View File

@ -121,7 +121,7 @@ VIR_ENUM_IMPL(qemuMonitorMigrationStatus,
VIR_ENUM_IMPL(qemuMonitorMigrationCaps,
QEMU_MONITOR_MIGRATION_CAPS_LAST,
"xbzrle")
"xbzrle", "auto-converge")
VIR_ENUM_IMPL(qemuMonitorVMStatus,
QEMU_MONITOR_VM_STATUS_LAST,

1
src/qemu/qemu_monitor.h
View File

@ -451,6 +451,7 @@ int qemuMonitorGetSpiceMigrationStatus(qemuMonitorPtr mon,
typedef enum {
QEMU_MONITOR_MIGRATION_CAPS_XBZRLE,
QEMU_MONITOR_MIGRATION_CAPS_AUTO_CONVERGE,
QEMU_MONITOR_MIGRATION_CAPS_LAST
} qemuMonitorMigrationCaps;

7
tools/virsh-domain.c
View File

@ -8757,6 +8757,10 @@ static const vshCmdOptDef opts_migrate[] = {
.type = VSH_OT_BOOL,
.help = N_("compress repeated pages during live migration")
},
{.name = "auto-converge",
.type = VSH_OT_BOOL,
.help = N_("force convergence during live migration")
},
{.name = "abort-on-error",
.type = VSH_OT_BOOL,
.help = N_("abort on soft errors during migration")
@ -8901,6 +8905,9 @@ doMigrate(void *opaque)
if (vshCommandOptBool(cmd, "compressed"))
flags |= VIR_MIGRATE_COMPRESSED;
if (vshCommandOptBool(cmd, "auto-converge"))
flags |= VIR_MIGRATE_AUTO_CONVERGE;
if (vshCommandOptBool(cmd, "offline")) {
flags |= VIR_MIGRATE_OFFLINE;
}