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From: Michal Hocko <mhocko@kernel.org>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: guro@fb.com, hannes@cmpxchg.org, vdavydov.dev@gmail.com,
	kernel-team@fb.com, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm,oom: fix oom invocation issues
Date: Thu, 18 May 2017 17:01:47 +0200	[thread overview]
Message-ID: <20170518150147.GB13940@dhcp22.suse.cz> (raw)
In-Reply-To: <20170518142901.GA13940@dhcp22.suse.cz>

On Thu 18-05-17 16:29:01, Michal Hocko wrote:
> On Thu 18-05-17 22:57:10, Tetsuo Handa wrote:
[...]
> > Anyway, I want
> > 
> > 	/* Avoid allocations with no watermarks from looping endlessly */
> > -	if (test_thread_flag(TIF_MEMDIE))
> > +	if (alloc_flags == ALLOC_NO_WATERMARKS && test_thread_flag(TIF_MEMDIE))
> > 		goto nopage;
> > 
> > so that we won't see similar backtraces and memory information from both
> > out_of_memory() and warn_alloc().
> 
> I do not think this is an improvement and it is unrelated to the
> discussion here.

I am sorry, I've misread the diff. It was the comment below the diff
which confused me. Now that I looked at it again it actually makes sense.
I would still like to get rid of out_of_memory from pagefault_out_of_memory
but doing the above sounds safer for the stable backport. Care to create
a proper patch with the full changelog, please?
-- 
Michal Hocko
SUSE Labs

WARNING: multiple messages have this Message-ID
From: Michal Hocko <mhocko@kernel.org>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: guro@fb.com, hannes@cmpxchg.org, vdavydov.dev@gmail.com,
	kernel-team@fb.com, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm,oom: fix oom invocation issues
Date: Thu, 18 May 2017 17:01:47 +0200	[thread overview]
Message-ID: <20170518150147.GB13940@dhcp22.suse.cz> (raw)
In-Reply-To: <20170518142901.GA13940@dhcp22.suse.cz>

On Thu 18-05-17 16:29:01, Michal Hocko wrote:
> On Thu 18-05-17 22:57:10, Tetsuo Handa wrote:
[...]
> > Anyway, I want
> > 
> > 	/* Avoid allocations with no watermarks from looping endlessly */
> > -	if (test_thread_flag(TIF_MEMDIE))
> > +	if (alloc_flags == ALLOC_NO_WATERMARKS && test_thread_flag(TIF_MEMDIE))
> > 		goto nopage;
> > 
> > so that we won't see similar backtraces and memory information from both
> > out_of_memory() and warn_alloc().
> 
> I do not think this is an improvement and it is unrelated to the
> discussion here.

I am sorry, I've misread the diff. It was the comment below the diff
which confused me. Now that I looked at it again it actually makes sense.
I would still like to get rid of out_of_memory from pagefault_out_of_memory
but doing the above sounds safer for the stable backport. Care to create
a proper patch with the full changelog, please?
-- 
Michal Hocko
SUSE Labs

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  parent reply	other threads:[~2017-05-18 15:01 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-17 15:26 Roman Gushchin
2017-05-17 15:26 ` Roman Gushchin
2017-05-17 16:14 ` Michal Hocko
2017-05-17 16:14   ` Michal Hocko
2017-05-17 19:43   ` Roman Gushchin
2017-05-17 19:43     ` Roman Gushchin
2017-05-17 22:03     ` Tetsuo Handa
2017-05-17 22:03       ` Tetsuo Handa
2017-05-18  8:47       ` Michal Hocko
2017-05-18  8:47         ` Michal Hocko
2017-05-18  9:00         ` Michal Hocko
2017-05-18  9:00           ` Michal Hocko
2017-05-18 13:20           ` Roman Gushchin
2017-05-18 13:20             ` Roman Gushchin
2017-05-18 13:57           ` Tetsuo Handa
2017-05-18 13:57             ` Tetsuo Handa
2017-05-18 14:29             ` Michal Hocko
2017-05-18 14:29               ` Michal Hocko
2017-05-18 14:57               ` Tetsuo Handa
2017-05-18 14:57                 ` Tetsuo Handa
2017-05-18 15:07                 ` Michal Hocko
2017-05-18 15:07                   ` Michal Hocko
2017-05-18 15:01               ` Michal Hocko [this message]
2017-05-18 15:01                 ` Michal Hocko
2017-05-18  8:01     ` Michal Hocko
2017-05-18  8:01       ` Michal Hocko

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