linux-ext4 - Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when FS is under heavy write load (massive starvation)

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Message-Id: <1177669065.3260.2.camel@Homer.simpson.net>
Date:	Fri, 27 Apr 2007 12:17:45 +0200
From:	Mike Galbraith <efault@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when
	FS is under heavy write load (massive starvation)

On Fri, 2007-04-27 at 01:33 -0700, Andrew Morton wrote:

> Another livelock possibility is that bonnie is redirtying pages faster than
> commit can write them out, so commit got livelocked:
> 
> When I was doing the original port-from-2.2 I found that an application
> which does
> 
> 	for ( ; ; )
> 		pwrite(fd, "", 1, 0);
> 
> would permanently livelock the fs.  I fixed that, but it was six years ago,
> and perhaps we later unfixed it.

Well, box doesn't seem the least bit upset after quite a while now, so I
guess it didn't get unfixed.

	-Mike

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