From: Mel Gorman <mgorman@suse.de>
To: Minchan Kim <minchan@kernel.org>
Cc: Linux-MM <linux-mm@kvack.org>, Rik van Riel <riel@redhat.com>,
Jim Schutt <jaschut@sandia.gov>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/6] mm: vmscan: Scale number of pages reclaimed by reclaim/compaction based on failures
Date: Wed, 8 Aug 2012 08:55:26 +0100 [thread overview]
Message-ID: <20120808075526.GI29814@suse.de> (raw)
In-Reply-To: <20120808014824.GB4247@bbox>
On Wed, Aug 08, 2012 at 10:48:24AM +0900, Minchan Kim wrote:
> Hi Mel,
>
> Just out of curiosity.
> What's the problem did you see? (ie, What's the problem do this patch solve?)
Everythign in this series is related to the problem in the leader - high
order allocation success rates are lower. This patch increases the success
rates when allocating under load.
> AFAIUC, it seem to solve consecutive allocation success ratio through
> getting several free pageblocks all at once in a process/kswapd
> reclaim context. Right?
Only pageblocks if it is order-9 on x86, it reclaims an amount that depends
on an allocation size. This only happens during reclaim/compaction context
when we know that a high-order allocation has recently failed. The objective
is to reclaim enough order-0 pages so that compaction can succeed again.
--
Mel Gorman
SUSE Labs
WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman@suse.de>
To: Minchan Kim <minchan@kernel.org>
Cc: Linux-MM <linux-mm@kvack.org>, Rik van Riel <riel@redhat.com>,
Jim Schutt <jaschut@sandia.gov>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/6] mm: vmscan: Scale number of pages reclaimed by reclaim/compaction based on failures
Date: Wed, 8 Aug 2012 08:55:26 +0100 [thread overview]
Message-ID: <20120808075526.GI29814@suse.de> (raw)
In-Reply-To: <20120808014824.GB4247@bbox>
On Wed, Aug 08, 2012 at 10:48:24AM +0900, Minchan Kim wrote:
> Hi Mel,
>
> Just out of curiosity.
> What's the problem did you see? (ie, What's the problem do this patch solve?)
Everythign in this series is related to the problem in the leader - high
order allocation success rates are lower. This patch increases the success
rates when allocating under load.
> AFAIUC, it seem to solve consecutive allocation success ratio through
> getting several free pageblocks all at once in a process/kswapd
> reclaim context. Right?
Only pageblocks if it is order-9 on x86, it reclaims an amount that depends
on an allocation size. This only happens during reclaim/compaction context
when we know that a high-order allocation has recently failed. The objective
is to reclaim enough order-0 pages so that compaction can succeed again.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2012-08-08 7:55 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-07 12:31 [RFC PATCH 0/6] Improve hugepage allocation success rates under load Mel Gorman
2012-08-07 12:31 ` Mel Gorman
2012-08-07 12:31 ` [PATCH 1/6] mm: compaction: Update comment in try_to_compact_pages Mel Gorman
2012-08-07 12:31 ` Mel Gorman
2012-08-07 13:19 ` Rik van Riel
2012-08-07 13:19 ` Rik van Riel
2012-08-07 23:25 ` Minchan Kim
2012-08-07 23:25 ` Minchan Kim
2012-08-07 12:31 ` [PATCH 2/6] mm: vmscan: Scale number of pages reclaimed by reclaim/compaction based on failures Mel Gorman
2012-08-07 12:31 ` Mel Gorman
2012-08-07 13:23 ` Rik van Riel
2012-08-07 13:23 ` Rik van Riel
2012-08-08 1:48 ` Minchan Kim
2012-08-08 1:48 ` Minchan Kim
2012-08-08 7:55 ` Mel Gorman [this message]
2012-08-08 7:55 ` Mel Gorman
2012-08-08 8:27 ` Minchan Kim
2012-08-08 8:27 ` Minchan Kim
2012-08-08 8:51 ` Mel Gorman
2012-08-08 8:51 ` Mel Gorman
2012-08-08 23:51 ` Minchan Kim
2012-08-08 23:51 ` Minchan Kim
2012-08-09 7:49 ` Mel Gorman
2012-08-09 7:49 ` Mel Gorman
2012-08-09 8:27 ` Minchan Kim
2012-08-09 8:27 ` Minchan Kim
2012-08-09 9:20 ` Mel Gorman
2012-08-09 9:20 ` Mel Gorman
2012-08-09 20:29 ` Rik van Riel
2012-08-09 20:29 ` Rik van Riel
2012-08-10 8:14 ` Mel Gorman
2012-08-10 8:14 ` Mel Gorman
2012-08-09 23:27 ` Minchan Kim
2012-08-09 23:27 ` Minchan Kim
2012-08-10 8:34 ` Mel Gorman
2012-08-10 8:34 ` Mel Gorman
2012-08-10 8:48 ` Minchan Kim
2012-08-10 8:48 ` Minchan Kim
2012-08-07 12:31 ` [PATCH 3/6] mm: kswapd: Continue reclaiming for reclaim/compaction if the minimum number of pages have not been reclaimed Mel Gorman
2012-08-07 12:31 ` Mel Gorman
2012-08-07 13:26 ` Rik van Riel
2012-08-07 13:26 ` Rik van Riel
2012-08-08 2:07 ` Minchan Kim
2012-08-08 2:07 ` Minchan Kim
2012-08-08 9:07 ` Mel Gorman
2012-08-08 9:07 ` Mel Gorman
2012-08-08 9:58 ` Mel Gorman
2012-08-08 9:58 ` Mel Gorman
2012-08-07 12:31 ` [PATCH 4/6] mm: compaction: Capture a suitable high-order page immediately when it is made available Mel Gorman
2012-08-07 12:31 ` Mel Gorman
2012-08-07 13:30 ` Rik van Riel
2012-08-07 13:30 ` Rik van Riel
2012-08-07 12:31 ` [PATCH 5/6] mm: have order > 0 compaction start off where it left Mel Gorman
2012-08-07 12:31 ` Mel Gorman
2012-08-07 12:31 ` [PATCH 6/6] mm: have order > 0 compaction start near a pageblock with free pages Mel Gorman
2012-08-07 12:31 ` Mel Gorman
2012-08-07 14:45 ` Rik van Riel
2012-08-07 14:45 ` Rik van Riel
2012-08-07 14:52 ` Mel Gorman
2012-08-07 14:52 ` Mel Gorman
2012-08-07 15:20 ` Jim Schutt
2012-08-07 15:20 ` Jim Schutt
2012-08-07 15:45 ` Mel Gorman
2012-08-07 15:45 ` Mel Gorman
2012-08-08 4:36 ` Minchan Kim
2012-08-08 4:36 ` Minchan Kim
2012-08-08 10:18 ` Mel Gorman
2012-08-08 10:18 ` Mel Gorman
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