From: Dave Chinner <david@fromorbit.com>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: xfs@oss.sgi.com, linux-mm@kvack.org
Subject: Re: [PATCH] mm, vmscan: Warn about possible deadlock at shirink_inactive_list
Date: Tue, 22 Sep 2015 07:52:41 +1000 [thread overview]
Message-ID: <20150921215241.GA19114@dastard> (raw)
In-Reply-To: <1442833794-23117-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp>
On Mon, Sep 21, 2015 at 08:09:54PM +0900, Tetsuo Handa wrote:
> This is a difficult-to-trigger silent hang up bug.
>
> The kswapd is allowed to bypass too_many_isolated() check in
> shrink_inactive_list(). But the kswapd can be blocked by locks in
> shrink_page_list() in shrink_inactive_list(). If the task which is
> blocking the kswapd is trying to allocate memory with the locks held,
> it forms memory reclaim deadlock.
It's a known problem in XFS and I'm currently working on patches to
fix it by hoisting the memory allocations outside of the CIL context
lock.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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prev parent reply other threads:[~2015-09-21 21:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-21 11:09 Tetsuo Handa
2015-09-21 11:13 ` Tetsuo Handa
2015-09-21 21:52 ` Dave Chinner [this message]
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