linux-kernel - Re: [PATCH] mm/vmstat: add oom

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Date:   Fri, 19 May 2017 12:10:14 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...nel.org>
Subject: Re: [PATCH] mm/vmstat: add oom_kill counter

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 <khlebnikov@...dex-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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>>
>