linux-kernel - Re: 2.6.20 OOM with 8Gb RAM

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Message-Id: <20070413163242.7d9283e1.akpm@linux-foundation.org>
Date:	Fri, 13 Apr 2007 16:32:42 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	William Lee Irwin III <wli@...omorphy.com>
Cc:	Jason Lunz <lunz@...ooley.org>, Cameron Schaus <cam@...aus.ca>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.20 OOM with 8Gb RAM

On Fri, 13 Apr 2007 15:54:33 -0700
William Lee Irwin III <wli@...omorphy.com> wrote:

> On Fri, Apr 13, 2007 at 03:46:53PM -0700, Andrew Morton wrote:
> > It's just weird - it exploits internal knowledge of VFS behaviour, diddles
> > with pagecache within a fake disk strategy handler, etc.
> > Furthermore, because it pretends to be a block device, the VFS will not use
> > highmem pages when accessing the ramdisk.  So the 8GB machine will go splat
> > with only 800MB of ramdisk.
> > ramfs is much cleaner and does not have that limitation.
> 
> After all this time, bdevs are still lowmem etc. Crying shame.

One would need to hunt down every use of b_data in filesystems and switch
them to kmap the page.

Possibly it could be done on a per-fs basis.
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