On 19.05.2017 12:05, Vlastimil Babka wrote:
On 05/19/2017 08:59 AM, Konstantin Khlebnikov wrote:
Show count of global oom killer invocations in /proc/vmstat


Maybe some more rationale why is that useful?

Currently the only way to detect oom kill is grepping kernel logs.
This counter makes such monitoring much easier.


Vlastimil

Signed-off-by: Konstantin Khlebnikov <khlebni...@yandex-team.ru>
---
  include/linux/vm_event_item.h |    1 +
  mm/oom_kill.c                 |    1 +
  mm/vmstat.c                   |    1 +
  3 files changed, 3 insertions(+)

diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index d84ae90ccd5c..1707e0a7d943 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -41,6 +41,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
                KSWAPD_LOW_WMARK_HIT_QUICKLY, KSWAPD_HIGH_WMARK_HIT_QUICKLY,
                PAGEOUTRUN, PGROTATED,
                DROP_PAGECACHE, DROP_SLAB,
+               OOM_KILL,
  #ifdef CONFIG_NUMA_BALANCING
                NUMA_PTE_UPDATES,
                NUMA_HUGE_PTE_UPDATES,
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 04c9143a8625..c734c42826cf 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -883,6 +883,7 @@ static void oom_kill_process(struct oom_control *oc, const 
char *message)
         */
        do_send_sig_info(SIGKILL, SEND_SIG_FORCED, victim, true);
        mark_oom_victim(victim);
+       count_vm_event(OOM_KILL);
        pr_err("Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, 
file-rss:%lukB, shmem-rss:%lukB\n",
                task_pid_nr(victim), victim->comm, K(victim->mm->total_vm),
                K(get_mm_counter(victim->mm, MM_ANONPAGES)),
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 76f73670200a..fe80b81a86e0 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1018,6 +1018,7 @@ const char * const vmstat_text[] = {
"drop_pagecache",
        "drop_slab",
+       "oom_kill",
#ifdef CONFIG_NUMA_BALANCING
        "numa_pte_updates",

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