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qemu: Add entry for balloon stats stat-htlb-pgalloc and stat-htlb-pgfail

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Qemu added reporting of virtio balloon new statistics stat-htlb-pgalloc and
stat-htlb-pgfail since qemu-3.0 commit b7b12644297. The value of
stat-htlb-pgalloc represents the number of successful hugetlb page allocations
while stat-htlb-pgfail represents the number of failed ones. Add this
statistics reporting to libvirt.

To enable this feature for vm, guest kenel >= 4.17 is required because
the exporting hugetlb page allocation for virtio balloon is introduced
since 6c64fe7f.

Signed-off-by: Han Han <hhan@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Han Han 2019-04-28 17:18:05 +08:00 committed by Michal Privoznik
parent dfd70ca1eb
commit a699b19f6c
6 changed files with 32 additions and 1 deletions
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14
include/libvirt/libvirt-domain.h
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@ -636,11 +636,23 @@ typedef enum {
*/
VIR_DOMAIN_MEMORY_STAT_DISK_CACHES = 10,
/*
* The amount of successful huge page allocations from inside the domain via
* virtio balloon.
*/
VIR_DOMAIN_MEMORY_STAT_HUGETLB_PGALLOC = 11,
/*
* The amount of failed huge page allocations from inside the domain via
* virtio balloon.
*/
VIR_DOMAIN_MEMORY_STAT_HUGETLB_PGFAIL = 12,
/*
* The number of statistics supported by this version of the interface.
* To add new statistics, add them to the enum and increase this value.
*/
VIR_DOMAIN_MEMORY_STAT_NR = 11,
VIR_DOMAIN_MEMORY_STAT_NR = 13,
# ifdef VIR_ENUM_SENTINELS
VIR_DOMAIN_MEMORY_STAT_LAST = VIR_DOMAIN_MEMORY_STAT_NR

4
src/libvirt-domain.c
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@ -5734,6 +5734,10 @@ virDomainGetInterfaceParameters(virDomainPtr domain,
* VIR_DOMAIN_MEMORY_STAT_DISK_CACHES
* Memory that can be reclaimed without additional I/O, typically disk
* caches (in kb).
* VIR_DOMAIN_MEMORY_STAT_HUGETLB_PGALLOC
* The amount of successful huge page allocations from inside the domain
* VIR_DOMAIN_MEMORY_STAT_HUGETLB_PGFAIL
* The amount of failed huge page allocations from inside the domain
*
* Returns: The number of stats provided or -1 in case of failure.
*/

2
src/qemu/qemu_driver.c
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@ -20248,6 +20248,8 @@ qemuDomainGetStatsBalloon(virQEMUDriverPtr driver,
STORE_MEM_RECORD(LAST_UPDATE, "last-update")
STORE_MEM_RECORD(USABLE, "usable")
STORE_MEM_RECORD(DISK_CACHES, "disk_caches")
STORE_MEM_RECORD(HUGETLB_PGALLOC, "hugetlb_pgalloc")
STORE_MEM_RECORD(HUGETLB_PGFAIL, "hugetlb_pgfail")
}
#undef STORE_MEM_RECORD

5
src/qemu/qemu_monitor_json.c
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@ -2150,6 +2150,11 @@ int qemuMonitorJSONGetMemoryStats(qemuMonitorPtr mon,
VIR_DOMAIN_MEMORY_STAT_LAST_UPDATE, 1);
GET_BALLOON_STATS(statsdata, "stat-disk-caches",
VIR_DOMAIN_MEMORY_STAT_DISK_CACHES, 1024);
GET_BALLOON_STATS(statsdata, "stat-htlb-pgalloc",
VIR_DOMAIN_MEMORY_STAT_HUGETLB_PGALLOC, 1);
GET_BALLOON_STATS(statsdata, "stat-htlb-pgfail",
VIR_DOMAIN_MEMORY_STAT_HUGETLB_PGFAIL, 1);
ret = got;
cleanup:
virJSONValueFree(cmd);

4
tools/virsh-domain-monitor.c
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@ -376,6 +376,10 @@ cmdDomMemStat(vshControl *ctl, const vshCmd *cmd)
vshPrint(ctl, "last_update %llu\n", stats[i].val);
if (stats[i].tag == VIR_DOMAIN_MEMORY_STAT_DISK_CACHES)
vshPrint(ctl, "disk_caches %llu\n", stats[i].val);
if (stats[i].tag == VIR_DOMAIN_MEMORY_STAT_HUGETLB_PGALLOC)
vshPrint(ctl, "hugetlb_pgalloc %llu\n", stats[i].val);
if (stats[i].tag == VIR_DOMAIN_MEMORY_STAT_HUGETLB_PGFAIL)
vshPrint(ctl, "hugetlb_pgfail %llu\n", stats[i].val);
}
ret = true;

4
tools/virsh.pod
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@ -938,6 +938,10 @@ without causing host swapping (in KiB)
last-update - Timestamp of the last update of statistics (in seconds)
disk_caches - The amount of memory that can be reclaimed without
additional I/O, typically disk caches (in KiB)
hugetlb_pgalloc - The number of successful huge page allocations initiated
from within the domain
hugetlb_pgfail - The number of failed huge page allocations initiated from
within the domain
For QEMU/KVM with a memory balloon, setting the optional I<--period> to a
value larger than 0 in seconds will allow the balloon driver to return