linux-kernel - Re: [PATCH] mm,oom: add tracepoints for oom reaper-related events

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Message-Id: <201705302217.JAI21823.FOFJtOQVOHLMSF@I-love.SAKURA.ne.jp>
Date:   Tue, 30 May 2017 22:17:11 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     mhocko@...nel.org, guro@...com
Cc:     hannes@...xchg.org, vdavydov.dev@...il.com, kernel-team@...com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm,oom: add tracepoints for oom reaper-related events

Michal Hocko wrote:
> On Tue 30-05-17 13:05:32, Roman Gushchin wrote:
> > Add tracepoints to simplify the debugging of the oom reaper code.
> > 
> > Trace the following events:
> > 1) a process is marked as an oom victim,
> > 2) a process is added to the oom reaper list,
> > 3) the oom reaper starts reaping process's mm,
> > 4) the oom reaper finished reaping,
> > 5) the oom reaper skips reaping.
> 
> I am not against but could you explain why the current printks are not
> sufficient? We do not have any explicit printk for the 2) and 3) but
> are those really necessary?
> 
> In other words could you describe the situation when you found these
> tracepoints more useful than what the kernel log offers already?

Guessing from "to simplify the debugging of the oom reaper code",
Roman is facing some unknown bugs or problems?