From: Andrew Morton <akpm@linux-foundation.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Christoph Lameter <cl@linux.com>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
Mel Gorman <mgorman@suse.de>,
Colin King <colin.king@canonical.com>,
Raghavendra D Prabhu <raghu.prabhu13@gmail.com>,
Jan Kara <jack@suse.cz>, Chris Mason <chris.mason@oracle.com>,
Pekka Enberg <penberg@kernel.org>, Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-ext4 <linux-ext4@vger.kernel.org>
Subject: Re: [PATCH 3/3] mm: slub: Default slub_max_order to 0
Date: Thu, 12 May 2011 10:37:09 -0700 [thread overview]
Message-ID: <20110512103709.abbc9872.akpm@linux-foundation.org> (raw)
In-Reply-To: <1305216638.3795.36.camel@edumazet-laptop>
On Thu, 12 May 2011 18:10:38 +0200 Eric Dumazet <eric.dumazet@gmail.com> wrote:
> More fuel to this discussion with commit 6d4831c2
>
> Something is wrong with high order allocations, on some machines.
>
> Maybe we can find real cause instead of limiting us to use order-0 pages
> in the end... ;)
>
> commit 6d4831c283530a5f2c6bd8172c13efa236eb149d
> Author: Andrew Morton <akpm@linux-foundation.org>
> Date: Wed Apr 27 15:26:41 2011 -0700
>
> vfs: avoid large kmalloc()s for the fdtable
Well, it's always been the case that satisfying higher-order
allocations take a disproportionate amount of work in page reclaim.
And often causes excessive reclaim.
That's why we've traditionally worked to avoid higher-order
allocations, and this has always been a problem with slub.
But the higher-order allocations shouldn't cause the VM to melt down.
We changed something, and now it melts down. Changing slub to avoid
that meltdown doesn't fix the thing we broke.
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next prev parent reply other threads:[~2011-05-12 17:37 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-11 15:29 [PATCH 0/3] Reduce impact to overall system of SLUB using high-order allocations Mel Gorman
2011-05-11 15:29 ` [PATCH 1/3] mm: slub: Do not wake kswapd for SLUBs speculative " Mel Gorman
2011-05-11 20:38 ` David Rientjes
2011-05-11 15:29 ` [PATCH 2/3] mm: slub: Do not take expensive steps " Mel Gorman
2011-05-11 20:38 ` David Rientjes
2011-05-11 21:10 ` Mel Gorman
2011-05-12 17:25 ` Andrea Arcangeli
2011-05-11 15:29 ` [PATCH 3/3] mm: slub: Default slub_max_order to 0 Mel Gorman
2011-05-11 20:38 ` David Rientjes
2011-05-11 20:53 ` James Bottomley
2011-05-11 21:09 ` Mel Gorman
2011-05-11 22:27 ` David Rientjes
2011-05-13 10:14 ` Mel Gorman
2011-05-12 17:36 ` Andrea Arcangeli
2011-05-16 21:03 ` David Rientjes
2011-05-17 9:48 ` Mel Gorman
2011-05-17 19:25 ` David Rientjes
2011-05-12 14:43 ` Christoph Lameter
2011-05-12 15:15 ` James Bottomley
2011-05-12 15:27 ` Christoph Lameter
2011-05-12 15:43 ` James Bottomley
2011-05-12 15:46 ` Dave Jones
2011-05-12 16:00 ` James Bottomley
2011-05-12 16:08 ` Dave Jones
2011-05-12 16:27 ` Christoph Lameter
2011-05-12 16:30 ` James Bottomley
2011-05-12 16:48 ` Christoph Lameter
2011-05-12 17:46 ` Andrea Arcangeli
2011-05-12 18:00 ` Christoph Lameter
2011-05-12 18:18 ` Andrea Arcangeli
2011-05-12 17:06 ` Pekka Enberg
2011-05-12 17:11 ` Pekka Enberg
2011-05-12 17:38 ` Christoph Lameter
2011-05-12 18:00 ` Andrea Arcangeli
2011-05-13 9:49 ` Mel Gorman
2011-05-15 16:39 ` Andrea Arcangeli
2011-05-16 8:42 ` Mel Gorman
2011-05-12 17:51 ` Andrea Arcangeli
2011-05-12 18:03 ` Christoph Lameter
2011-05-12 18:09 ` Andrea Arcangeli
2011-05-12 18:16 ` Christoph Lameter
2011-05-12 18:36 ` James Bottomley
2011-05-12 17:40 ` Andrea Arcangeli
2011-05-12 15:55 ` Pekka Enberg
2011-05-12 18:37 ` James Bottomley
2011-05-12 18:46 ` Christoph Lameter
2011-05-12 19:21 ` James Bottomley
2011-05-12 19:44 ` James Bottomley
2011-05-12 20:04 ` James Bottomley
2011-05-12 20:29 ` Johannes Weiner
2011-05-12 20:31 ` Johannes Weiner
2011-05-12 20:31 ` James Bottomley
2011-05-12 22:04 ` James Bottomley
2011-05-12 22:15 ` Johannes Weiner
2011-05-12 22:58 ` Minchan Kim
2011-05-13 5:39 ` Minchan Kim
2011-05-13 0:47 ` James Bottomley
2011-05-13 4:12 ` James Bottomley
2011-05-13 10:55 ` Mel Gorman
2011-05-13 14:16 ` James Bottomley
2011-05-13 10:30 ` Mel Gorman
2011-05-13 6:16 ` Pekka Enberg
2011-05-13 10:05 ` Mel Gorman
2011-05-12 16:01 ` Christoph Lameter
2011-05-12 16:10 ` Eric Dumazet
2011-05-12 17:37 ` Andrew Morton [this message]
2011-05-12 15:45 ` Dave Jones
2011-05-11 21:39 ` [PATCH 0/3] Reduce impact to overall system of SLUB using high-order allocations James Bottomley
2011-05-11 22:28 ` David Rientjes
2011-05-11 22:34 ` James Bottomley
2011-05-12 11:13 ` Pekka Enberg
2011-05-12 13:19 ` Mel Gorman
2011-05-12 14:04 ` James Bottomley
2011-05-12 15:53 ` James Bottomley
2011-05-13 11:25 ` Mel Gorman
2011-05-12 18:04 ` Andrea Arcangeli
2011-05-13 11:24 ` Mel Gorman
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