linux-kernel - Re: [PATCH] ring-buffer: Add set/clear_current_oom

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Date:   Wed, 4 Apr 2018 12:13:26 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Zhaoyang Huang <huangzhaoyang@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        kernel-patch-test@...ts.linaro.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH] ring-buffer: Add set/clear_current_oom_origin() during
 allocations

On Wed, 4 Apr 2018 09:03:47 -0700
Joel Fernandes <joelaf@...gle.com> wrote:


> > for the tests. Note, without this, I tried to allocate all memory
> > (bisecting it with allocations that failed and allocations that
> > succeeded), and couldn't trigger an OOM :-/  
> 
> I guess you need to have something *else* other than the write to
> buffer_size_kb doing the GFP_KERNEL allocations but unfortunately gets
> OOM killed?

Yeah, for some reason, my test box seems to always have something doing
that, because I trigger an OOM about 2 out of every 3 tries.

Here's the tasks that trigger it:

 lvmetad, crond, systemd-journal, abrt-dump-journ, chronyd,

I guess my system is rather busy even when idle :-/

> 
> Also, I agree with the new patch and its nice idea to do that.

Thanks, want to give it a test too?

-- Steve