linux-kernel - Re: [RFC PATCH] shrink_dcache

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Message-ID: <CA+55aFxRroO0KAz8qbhz_2vDc=bc-C2b0ux0tdFfQhBGMnqRzQ@mail.gmail.com>
Date:	Mon, 9 Jan 2012 10:46:22 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	mgorman@...e.de, gregkh@...e.de, akpm@...ux-foundation.org,
	david@...morbit.com
Subject: Re: [RFC PATCH] shrink_dcache_parent() deadlock

On Mon, Jan 9, 2012 at 10:30 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Here's a TOTALLY UNTESTED rebase of just that single patch from Dave.

Well, it boots, and the dentry cache shrinks under memory pressure. So
it's not _totally_ untested now.

But I don't really see why it would fix Miklos' case. I think
select_parent() may still end up touching the d_lru list of something
that is on the 'dispose' list. So the patch looks like a nice cleanup,
but it seems to be independent of the issue Miklos found.

What am I missing now?

                      Linus
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