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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
View File

@ -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]);

6
include/uapi/linux/virtio_balloon.h
View File

@ -72,7 +72,8 @@ struct virtio_balloon_config {
#define VIRTIO_BALLOON_S_HTLB_PGALLOC 8 /* Hugetlb page allocations */
#define VIRTIO_BALLOON_S_HTLB_PGFAIL 9 /* Hugetlb page allocation failures */
#define VIRTIO_BALLOON_S_OOM_KILL 10 /* OOM killer invocations */
#define VIRTIO_BALLOON_S_NR 11
#define VIRTIO_BALLOON_S_ALLOC_STALL 11 /* Stall count of memory allocatoin */
#define VIRTIO_BALLOON_S_NR 12
#define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \
VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \
@ -85,7 +86,8 @@ struct virtio_balloon_config {
VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \
VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \
VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures", \
VIRTIO_BALLOON_S_NAMES_prefix "oom-kills" \
VIRTIO_BALLOON_S_NAMES_prefix "oom-kills", \
VIRTIO_BALLOON_S_NAMES_prefix "alloc-stalls" \
}
#define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("")