linux-kernel - Re: [PATCH 1/4] kselftests: memcg: update the oom group leaf events test

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Date:   Fri, 15 Apr 2022 08:59:48 -0700
From:   Roman Gushchin <roman.gushchin@...ux.dev>
To:     David Vernet <void@...ifault.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, cgroups@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Chris Down <chris@...isdown.name>
Subject: Re: [PATCH 1/4] kselftests: memcg: update the oom group leaf events test


> On Apr 15, 2022, at 7:08 AM, David Vernet <void@...ifault.com> wrote:
> 
> On Thu, Apr 14, 2022 at 05:01:30PM -0700, Roman Gushchin wrote:
>> Commit 9852ae3fe529 ("mm, memcg: consider subtrees in memory.events") made
>> memory.events recursive: all events are propagated upwards by the
>> tree. It was a change in semantics.
> 
> In one of our offline discussions you mentioned that we may want to
> consider having the test take mount options into account. If we decide to
> go that route we should probably have this testcase take memory_localevents
> into account as well. If so, I'm happy to take care of that in a follow-on
> patch after this is merged as I already have a patch locally that reads and
> parses /proc/mounts to detect these mount options.

It would be great, thank you!

>> -    if (cg_read_key_long(parent, "memory.events", "oom_kill ") != 0)
>> +    if (cg_read_key_long(parent, "memory.events", "oom_kill ") <= 0)
>>        goto cleanup;
>> 
>>    ret = KSFT_PASS;
>> -- 
>> 2.35.1
>> 
> 
> Looks good, thanks.
> 
> Reviewed-by: David Vernet <void@...ifault.com>

Thanks!