From 6cf1c97dad2ebc4de03105cc444b3dfaa83f3dc2 Mon Sep 17 00:00:00 2001 From: zhenwei pi Date: Tue, 23 Apr 2024 11:41:07 +0800 Subject: [PATCH] virtio_balloon: introduce oom-kill invocations When the guest OS runs under critical memory pressure, the guest starts to kill processes. A guest monitor agent may scan 'oom_kill' from /proc/vmstat, and reports the OOM KILL event. However, the agent may be killed and we will loss this critical event(and the later events). For now we can also grep for magic words in guest kernel log from host side. Rather than this unstable way, virtio balloon reports OOM-KILL invocations instead. Acked-by: David Hildenbrand Signed-off-by: zhenwei pi Message-Id: <20240423034109.1552866-3-pizhenwei@bytedance.com> Signed-off-by: Michael S. Tsirkin --- drivers/virtio/virtio_balloon.c | 1 + include/uapi/linux/virtio_balloon.h | 6 ++++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 54469277ca30..b54392366142 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -363,6 +363,7 @@ static inline unsigned int update_balloon_vm_stats(struct virtio_balloon *vb) pages_to_bytes(events[PSWPOUT])); update_stat(vb, idx++, VIRTIO_BALLOON_S_MAJFLT, events[PGMAJFAULT]); update_stat(vb, idx++, VIRTIO_BALLOON_S_MINFLT, events[PGFAULT]); + update_stat(vb, idx++, VIRTIO_BALLOON_S_OOM_KILL, events[OOM_KILL]); #ifdef CONFIG_HUGETLB_PAGE update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGALLOC, diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h index ddaa45e723c4..b17bbe033697 100644 --- a/include/uapi/linux/virtio_balloon.h +++ b/include/uapi/linux/virtio_balloon.h @@ -71,7 +71,8 @@ struct virtio_balloon_config { #define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */ #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_NR 10 +#define VIRTIO_BALLOON_S_OOM_KILL 10 /* OOM killer invocations */ +#define VIRTIO_BALLOON_S_NR 11 #define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \ VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \ @@ -83,7 +84,8 @@ struct virtio_balloon_config { VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \ 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 "hugetlb-failures", \ + VIRTIO_BALLOON_S_NAMES_prefix "oom-kills" \ } #define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("") -- 2.25.1