linux-kernel - Re: 2.6.28-rc8 big regression in VM

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Message-ID: <20081216045938.GA1000@localhost>
Date:	Tue, 16 Dec 2008 12:59:38 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Lukas Hejtmanek <xhejtman@....muni.cz>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.28-rc8 big regression in VM

On Mon, Dec 15, 2008 at 11:44:09AM +0200, Lukas Hejtmanek wrote:
> On Mon, Dec 15, 2008 at 09:16:45AM +0800, Wu Fengguang wrote:
> > Lukas, could you apply the attached patch, recompile and do
> > 
> > modprobe filecache
> > free; cp /proc/filecache /tmp/a;
> > echo 3 > /proc/sys/vm/drop_caches
> > free; cp /proc/filecache /tmp/b;
> > 
> > and send me the outputs a and b?
> 
> unfortunately, it causes an oops (0000 [#1] SMP) in d_path + 0x31/0x110, code
> 48 85 c0 74 2f <48> 8b 40 30 48
> rax = 0x100000001
> 
> (it does not save the oops into any log, thus I only wrote down possibly most
> important clues)

Sorry I made a silly mistake while rebasing the patch to 2.6.28.
The attached patch works OK here.

Thanks,
Fengguang


View attachment "filecache-2.6.28.patch" of type "text/x-diff" (31993 bytes)