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From: Mel Gorman <mgorman@suse.de>
To: Jonathan Nieder <jrnieder@gmail.com>
Cc: Stable <stable@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 30/34] mm: vmscan: Do not force kswapd to scan small targets
Date: Thu, 19 Jul 2012 23:08:55 +0100	[thread overview]
Message-ID: <20120719220855.GA9222@suse.de> (raw)
In-Reply-To: <20120719203743.GD19392@burratino>

On Thu, Jul 19, 2012 at 03:37:43PM -0500, Jonathan Nieder wrote:
> Mel Gorman wrote:
> 
> > commit ad2b8e601099a23dffffb53f91c18d874fe98854 upstream - WARNING: partial backport only
> >
> > Stable note: Not tracked in Bugzilla. This patch is very controversial for
> > 	-stable. The upstream patch is addressing a completely different
> > 	issue but accidentally contained an important fix. The workload
> > 	in question was running memcached and then started IO in the
> > 	background. memcached should stay resident but without this patch
> > 	it gets swapped. Sometimes this manifests as a drop in throughput
> > 	but mostly it was observed through /proc/vmstat.
> 
> I had thought partial backports like this were pretty normal and ok,
> actually, as long as they are well explained. 

I was not aware of that and it's not something I had noticed for any other
MM backports to -stable. I wanted to call it out instead of seeing if
reviewers happened to spot the upstream commit did not resemble this patch :)

> Otherwise there would
> be no way to fix bugs in stable in the above situation.
> 

If there is no problem with this then the note can change slightly

Stable note: Not tracked in Bugzilla. This is a partial backport of an
	upstream commit addressing a completely different issue
	that accidentally contained an important fix. The workload
	this patch helps was memcached when IO is started in the
	background. memcached should stay resident but without this patch
	it gets swapped. Sometimes this manifests as a drop in throughput
	but mostly it was observed through /proc/vmstat.

-- 
Mel Gorman
SUSE Labs

  reply	other threads:[~2012-07-19 22:09 UTC|newest]

Thread overview: 94+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-19 14:36 [PATCH 00/34] Memory management performance backports for -stable Mel Gorman
2012-07-19 14:36 ` Mel Gorman
2012-07-19 14:36 ` [PATCH 01/34] mm: vmstat: cache align vm_stat Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 02/34] mm: memory hotplug: Check if pages are correctly reserved on a per-section basis Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 03/34] mm: Reduce the amount of work done when updating min_free_kbytes Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 04/34] mm: vmscan: fix force-scanning small targets without swap Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 05/34] vmscan: clear ZONE_CONGESTED for zone with good watermark Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 06/34] vmscan: add shrink_slab tracepoints Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 20:30   ` Jonathan Nieder
2012-07-19 22:04     ` Mel Gorman
2012-07-19 22:07       ` Jonathan Nieder
2012-07-20 10:06         ` Mel Gorman
2012-07-20 15:54           ` Jonathan Nieder
2012-07-23  9:20             ` Mel Gorman
2012-07-19 14:36 ` [PATCH 07/34] vmscan: shrinker->nr updates race and go wrong Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 08/34] vmscan: reduce wind up shrinker->nr when shrinker can't do work Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 09/34] mm: limit direct reclaim for higher order allocations Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 10/34] mm: Abort reclaim/compaction if compaction can proceed Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 11/34] mm: compaction: trivial clean up in acct_isolated() Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 12/34] mm: change isolate mode from #define to bitwise type Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 13/34] mm: compaction: make isolate_lru_page() filter-aware Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 14/34] mm: zone_reclaim: " Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 15/34] mm: migration: clean up unmap_and_move() Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 16/34] mm: compaction: Allow compaction to isolate dirty pages Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 17/34] mm: compaction: Determine if dirty pages can be migrated without blocking within ->migratepage Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 18/34] mm: page allocator: Do not call direct reclaim for THP allocations while compaction is deferred Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 19/34] mm: compaction: make isolate_lru_page() filter-aware again Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 20/34] kswapd: avoid unnecessary rebalance after an unsuccessful balancing Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 21/34] kswapd: assign new_order and new_classzone_idx after wakeup in sleeping Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-22 19:25   ` Hugh Dickins
2012-07-23  9:37     ` Mel Gorman
2012-07-23  9:37       ` Mel Gorman
2012-07-19 14:36 ` [PATCH 22/34] mm: compaction: Introduce sync-light migration for use by compaction Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 23/34] mm: vmscan: When reclaiming for compaction, ensure there are sufficient free pages available Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 24/34] mm: vmscan: Do not OOM if aborting reclaim to start compaction Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 25/34] mm: vmscan: Check if reclaim should really abort even if compaction_ready() is true for one zone Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 26/34] vmscan: promote shared file mapped pages Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 27/34] vmscan: activate executable pages after first usage Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 28/34] mm/vmscan.c: consider swap space when deciding whether to continue reclaim Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 29/34] mm: test PageSwapBacked in lumpy reclaim Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 30/34] mm: vmscan: Do not force kswapd to scan small targets Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 20:37   ` Jonathan Nieder
2012-07-19 22:08     ` Mel Gorman [this message]
2012-07-19 14:36 ` [PATCH 31/34] cpusets: avoid looping when storing to mems_allowed if one node remains set Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 32/34] cpusets: stall when updating mems_allowed for mempolicy or disjoint nodemask Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 33/34] cpuset: mm: Reduce large amounts of memory barrier related damage v3 Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 14:36 ` [PATCH 34/34] mm/hugetlb: fix warning in alloc_huge_page/dequeue_huge_page_vma Mel Gorman
2012-07-19 14:36   ` Mel Gorman
2012-07-19 20:25   ` Jonathan Nieder
2012-07-19 21:53     ` Mel Gorman
2012-07-22 22:58 ` [PATCH 00/34] Memory management performance backports for -stable Ben Hutchings
2012-07-23  9:16   ` Mel Gorman
2012-07-23  9:16     ` Mel Gorman
2012-07-23 13:38 [PATCH 00/34] Memory management performance backports for -stable V2 Mel Gorman
2012-07-23 13:38 ` [PATCH 30/34] mm: vmscan: Do not force kswapd to scan small targets Mel Gorman
2012-07-23 13:38   ` Mel Gorman
2012-07-25 19:59   ` Greg KH
2012-07-25 19:59     ` Greg KH
2012-07-25 21:35     ` Mel Gorman
2012-07-25 21:35       ` Mel Gorman
2012-07-25 21:44       ` Greg KH
2012-07-25 21:44         ` Greg KH

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