linux-kernel - Re: [PATCH 0/2] initial while_each

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Date:	Tue, 3 Dec 2013 21:22:49 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	William Dauchy <wdauchy@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mandeep Singh Baines <msb@...omium.org>,
	"Ma, Xindong" <xindong.ma@...el.com>,
	Michal Hocko <mhocko@...e.cz>,
	Sameer Nanda <snanda@...omium.org>,
	Sergey Dyasly <dserrg@...il.com>,
	"Tu, Xiaobing" <xiaobing.tu@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] initial while_each_thread() fixes

Hi William,

On 12/03, William Dauchy wrote:
>
> I was wondering if this patch was also targeted for stable branch?

Unlikely... but we will see.

> Before this patch, I was testing this one
> https://lkml.org/lkml/2013/11/13/336

perhaps this patch makes more sense for stable.

But, to clarify just in case, it is not needed after this series.

> which is fixing my oom issues.

Yes, but it doesn't fix all problems even in mm/oom_kill.c, and
we need to fix while_each_thread() anyway.

> I applied the two patches on top of a 3.10.x and got some tasks
> stalled after the first OOM:

So you are saying that this was introduced by this series?

Could you retest with the recent kernel?

> INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 21,
> t=15014 jiffies, g=65569, c=65568, q=6537)

This series does not expand the rcu-locked sections except: it adds
rcu_read_lock() into has_intersects_mems_allowed() but this is the
obvious bugfix.

So far I _think_ that this series should not be blamed for that, but
I'll try to recheck.

Oleg.

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