From: Andi Kleen <ak@muc.de>
To: Andrew Morton <akpm@osdl.org>
Cc: andrea@suse.de, linux-kernel@vger.kernel.org
Subject: Re: OOM fixes 2/5
Date: Fri, 21 Jan 2005 08:08:21 +0100 [thread overview]
Message-ID: <m14qhb1cpm.fsf@muc.de> (raw)
In-Reply-To: <20050120224645.3351d22c.akpm@osdl.org> (Andrew Morton's message of "Thu, 20 Jan 2005 22:46:45 -0800")
Andrew Morton <akpm@osdl.org> writes:
> Just that it throws away a bunch of potentially usable memory. In three
> years I've seen zero reports of any problems which would have been solved
> by increasing the protection ratio.
We ran into a big problem with this on x86-64. The SUSE installer
would load the floppy driver during installation. Floppy driver would
try to allocate some pages with GFP_DMA and on a small memory x86-64
system (256-512MB) the OOM killer would always start to kill things
trying to free some DMA pages. This was quite a show stopper
because you effectively couldn't install.
So at least for GFP_DMA it seems to be definitely needed.
-Andi
next prev parent reply other threads:[~2005-01-21 7:08 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-21 5:48 OOM fixes 1/5 Andrea Arcangeli
2005-01-21 5:49 ` OOM fixes 2/5 Andrea Arcangeli
2005-01-21 5:49 ` OOM fixes 3/5 Andrea Arcangeli
2005-01-21 5:50 ` OOM fixes 4/5 Andrea Arcangeli
2005-01-21 5:50 ` OOM fixes 5/5 Andrea Arcangeli
2005-01-21 6:01 ` writeback-highmem Andrea Arcangeli
2005-01-21 6:26 ` writeback-highmem Andrew Morton
2005-01-21 6:41 ` writeback-highmem Andrea Arcangeli
2005-01-21 13:46 ` writeback-highmem Rik van Riel
2005-01-21 6:20 ` OOM fixes 2/5 Andrew Morton
2005-01-21 6:35 ` Andrea Arcangeli
2005-01-21 6:36 ` Nick Piggin
2005-01-21 6:46 ` Andrew Morton
2005-01-21 7:04 ` Nick Piggin
2005-01-21 7:17 ` Andrea Arcangeli
2005-01-21 7:04 ` Andrea Arcangeli
2005-01-21 7:08 ` Andi Kleen [this message]
2005-01-21 7:21 ` Andrea Arcangeli
2005-01-21 6:52 ` Andrea Arcangeli
2005-01-21 7:00 ` Andrew Morton
2005-01-21 7:10 ` Andrea Arcangeli
2005-01-22 6:35 ` OOM fixes 1/5 Andrea Arcangeli
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