linux-kernel - Re: [patch 9/9] mm: fix pagecache write deadlocks

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Message-ID: <20070204105015.GB29943@wotan.suse.de>
Date:	Sun, 4 Feb 2007 11:50:15 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Filesystems <linux-fsdevel@...r.kernel.org>,
	Linux Memory Management <linux-mm@...ck.org>
Subject: Re: [patch 9/9] mm: fix pagecache write deadlocks

On Sun, Feb 04, 2007 at 11:46:09AM +0100, Nick Piggin wrote:
> 
> > It's better than taking mmap_sem and walking pagetables...
> 
> I'm not convinced.

Though I am more convinced that looking at mm *at all* (either to
take the mmap_sem and find the vma, or to take the mmap_sem and
run get_user_pages) is going to hurt.

We'd have to special case kernel threads, which don't even have an
mm, let alone the vmas... too ugly.

I'll revert to my temporary-page approach: at least that will
fix the problem.

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