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Date: Mon, 7 Mar 2005 14:02:27 +0100
From: Andrea Arcangeli <andrea@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>, greg@kroah.com,
       linux-kernel@vger.kernel.org
Subject: Re: [patch 2/5] setup_per_zone_lowmem_reserve() oops fix
Message-ID: <20050307130227.GQ8880@opteron.random>
References: <200503042117.j24LHGrx017967@shell0.pdx.osdl.net> <422C0C5D.3060404@yahoo.com.au> <20050307002048.51aac96b.akpm@osdl.org>
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On Mon, Mar 07, 2005 at 12:20:48AM -0800, Andrew Morton wrote:
> I haven't thought about it yet, but there must be some way to avoid leaving
> huge amounts of lowmem free.  It should be OK to allow lowmem to be fully
> used, as long as there's sufficent reclaimable stuff in there - slab,
> blockdev pagecache, etc.  (Assuming nothing sane mmaps blockdevs.  INND
> does).  Dunno....

Then mlock will have to unmap and migrate the cache, it's just much more
complicated, but it's certainly doable.