linux-kernel - Re: [PATCH] mm/page_owner: print largest memory consumer when OOM panic occurs

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Date:   Fri, 27 Dec 2019 15:44:30 +0800
From:   Miles Chen <miles.chen@...iatek.com>
To:     Qian Cai <cai@....pw>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-mediatek@...ts.infradead.org>,
        <wsd_upstream@...iatek.com>
Subject: Re: [PATCH] mm/page_owner: print largest memory consumer when OOM
 panic occurs

On Thu, 2019-12-26 at 00:53 -0500, Qian Cai wrote:
> 
> > On Dec 25, 2019, at 11:01 PM, Miles Chen <miles.chen@...iatek.com> wrote:
> > 
> > That is what the patch does -- targeting on the memory leakage which causes an OOM kernel panic, so the greatest consumer information helps (the amount of leakage is big enough to cause an OOM kernel panic)
> > 
> > I've posted the number of real problems since 2019/5 I solved by this approach.
> 
> The point is in order to make your debugging patch upstream, it has to be general useful. Right now, 

> it feels rather situational for me for the reasons given in the previous emails.

It's not complete situation.

I've listed different OOM panic situations in previous email [1]
and what we can do about them with current information.

There are some cases which cannot be covered by current information
easily.
For example: a memory leakage caused by alloc_pages() or vmalloc() with
a large size.
I keep seeing these issues for years and that's why I built this patch. 
It's like a missing piece of the puzzle.

To prove that the approach is practical and useful, I have collected
real test cases
under real devices and posted the test result in the commit message.
These are real cases, not my imagination.

[1] https://lkml.org/lkml/2019/12/25/53

thanks again for your comments

  Miles