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.

zhenwei pi committed 2 years ago

Commit 6cf1c971 parent e25fbcd2 files · +5 −2Browse files

Showing the changes to include/uapi (1 of 2 files). Show all

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include/uapi/linux/virtio_balloon.h+4−2

@@ -71,7 +71,8 @@ struct virtio_balloon_config { · 70 unmodified lines
71	71	#define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */
72	72	#define VIRTIO_BALLOON_S_HTLB_PGALLOC 8 /* Hugetlb page allocations */
73	73	#define VIRTIO_BALLOON_S_HTLB_PGFAIL 9 /* Hugetlb page allocation failures */
74		−#define VIRTIO_BALLOON_S_NR 10
	74	+#define VIRTIO_BALLOON_S_OOM_KILL 10 /* OOM killer invocations */
	75	+#define VIRTIO_BALLOON_S_NR 11
75	76
76	77	#define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \
77	78	VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \
@@ -83,7 +84,8 @@ struct virtio_balloon_config { · 5 unmodified lines
83	84	VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \
84	85	VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \
85	86	VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \
86		− VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures" \
	87	+ VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures", \
	88	+ VIRTIO_BALLOON_S_NAMES_prefix "oom-kills" \
87	89	}
88	90
89	91	#define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("")