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virtio_balloon: introduce memory allocation stall counter

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Memory allocation stall counter represents the performance/latency of
memory allocation, expose this counter to the host side by virtio
balloon device via out-of-bound way.

Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20240423034109.1552866-4-pizhenwei@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
zhenwei pi
2024-04-23 11:41:08 +08:00
committed by Michael S. Tsirkin
parent 6cf1c97dad
commit c5b70a26aa
2 changed files with 12 additions and 2 deletions
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8
drivers/virtio/virtio_balloon.c
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@@ -355,6 +355,8 @@ static inline unsigned int update_balloon_vm_stats(struct virtio_balloon *vb)
{
unsigned long events[NR_VM_EVENT_ITEMS];
unsigned int idx = 0;
unsigned int zid;
unsigned long stall = 0;
all_vm_events(events);
update_stat(vb, idx++, VIRTIO_BALLOON_S_SWAP_IN,
@@ -365,6 +367,12 @@ static inline unsigned int update_balloon_vm_stats(struct virtio_balloon *vb)
update_stat(vb, idx++, VIRTIO_BALLOON_S_MINFLT, events[PGFAULT]);
update_stat(vb, idx++, VIRTIO_BALLOON_S_OOM_KILL, events[OOM_KILL]);
/* sum all the stall events */
for (zid = 0; zid < MAX_NR_ZONES; zid++)
stall += events[ALLOCSTALL_NORMAL - ZONE_NORMAL + zid];
update_stat(vb, idx++, VIRTIO_BALLOON_S_ALLOC_STALL, stall);
#ifdef CONFIG_HUGETLB_PAGE
update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGALLOC,
events[HTLB_BUDDY_PGALLOC]);