linux-kernel - Re: [PATCH v3] mm: memcontrol: Don't flood OOM messages with no eligible task.

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Date:   Thu, 18 Oct 2018 17:13:52 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com, guro@...com,
        kirill.shutemov@...ux.intel.com, linux-kernel@...r.kernel.org,
        rientjes@...gle.com, yang.s@...baba-inc.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        syzbot <syzbot+77e6b28a7a7106ad0def@...kaller.appspotmail.com>
Subject: Re: [PATCH v3] mm: memcontrol: Don't flood OOM messages with no
 eligible task.

On (10/18/18 09:56), Michal Hocko wrote:
> On Thu 18-10-18 15:10:18, Sergey Senozhatsky wrote:
> [...]
> > and let's hear from MM people what they can suggest.
> > 
> > Michal, Andrew, Johannes, any thoughts?
> 
> I have already stated my position. Let's not reinvent the wheel and use
> the standard printk throttling. If there are cases where oom reports
> cause more harm than good I am open to add a knob to allow disabling it
> altogether (it can be even fine grained one to control whether to dump
> show_mem, task_list etc.).

A knob might do.
As well as /proc/sys/kernel/printk tweaks, probably. One can even add
echo "a b c d" > /proc/sys/kernel/printk to .bashrc and adjust printk
console levels on login and rollback to old values in .bash_logout
May be.

> But please let's stop this dubious one-off approaches.

OK. Well, I'm not proposing anything actually. I didn't even
realize until recently that Tetsuo was talking about "user
interaction" problem; I thought that his problem was stalled
RCU.

	-ss