linux-kernel - Re: dcache shrink list corruption?

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Message-ID: <20140429175654.GI18016@ZenIV.linux.org.uk>
Date:	Tue, 29 Apr 2014 18:56:54 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: dcache shrink list corruption?

On Tue, Apr 29, 2014 at 06:01:39PM +0200, Miklos Szeredi wrote:

> Attached patch is just a starting point (untested).  Not sure how to minimize
> contention without adding too much complexity.

Contention isn't the worst problem here - I'd expect the cacheline ping-pong
to hurt more...  I agree with the analysis, but I'd really like to avoid that
spinlock ;-/

Let me see if we can avoid that...  Oh, well - at least that's a good excuse
to take a break from fucking deadlock analysis around the damn acct(2), most
of VFS and network filesystems ;-/
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