From: Mel Gorman <mgorman@suse.de>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: linux-mm@kvack.org, Minchan Kim <minchan.kim@gmail.com>,
Jan Kara <jack@suse.cz>, Andy Isaacson <adi@hexapodia.org>,
Rik van Riel <riel@redhat.com>,
Johannes Weiner <jweiner@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 7/8] Revert "vmscan: abort reclaim/compaction if compaction can proceed"
Date: Mon, 21 Nov 2011 13:09:15 +0000 [thread overview]
Message-ID: <20111121130915.GF19415@suse.de> (raw)
In-Reply-To: <1321732460-14155-8-git-send-email-aarcange@redhat.com>
On Sat, Nov 19, 2011 at 08:54:19PM +0100, Andrea Arcangeli wrote:
> This reverts commit e0c23279c9f800c403f37511484d9014ac83adec.
>
> If reclaim runs with an high order allocation, it means compaction
> failed. That means something went wrong with compaction so we can't
> stop reclaim too. We can't assume it failed and was deferred because
> of the too low watermarks in compaction_suitable only, it may have
> failed for other reasons.
>
When Rik was testing with THP enabled, he found that there was way
too much memory free on his machine. The problem was that THP caused
reclaim to be too aggressive and that's what led to that pair of
patches. While I do not think it was confirmed, the expectation was
that the performance of workloads whose working set size was close
to total physical RAM and mostly filesystem-backed files would suffer
if THP was enabled.
In other words, reverting these patches needs to be a last resort.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2011-11-21 13:09 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-18 16:58 [RFC PATCH 0/5] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v3 Mel Gorman
2011-11-18 16:58 ` [PATCH 1/5] mm: compaction: Allow compaction to isolate dirty pages Mel Gorman
2011-11-18 17:28 ` Andrea Arcangeli
2011-11-21 17:16 ` Rik van Riel
2011-11-18 16:58 ` [PATCH 2/5] mm: compaction: Use synchronous compaction for /proc/sys/vm/compact_memory Mel Gorman
2011-11-18 17:27 ` Andrea Arcangeli
2011-11-21 21:46 ` Rik van Riel
2011-11-18 16:58 ` [PATCH 3/5] mm: Do not stall in synchronous compaction for THP allocations Mel Gorman
2011-11-18 17:34 ` Andrea Arcangeli
2011-11-18 16:58 ` [PATCH 4/5] mm: compaction: Determine if dirty pages can be migreated without blocking within ->migratepage Mel Gorman
2011-11-18 21:35 ` Andrea Arcangeli
2011-11-21 11:17 ` Mel Gorman
2011-11-21 22:45 ` Andrea Arcangeli
2011-11-22 0:55 ` [PATCH] mm: compaction: make buffer cache __GFP_MOVABLE Rik van Riel
2011-11-22 12:59 ` [PATCH 4/5] mm: compaction: Determine if dirty pages can be migreated without blocking within ->migratepage Mel Gorman
2011-11-24 1:19 ` Andrea Arcangeli
2011-11-24 12:21 ` Mel Gorman
2011-11-26 6:51 ` Andy Isaacson
2011-11-27 20:50 ` Rik van Riel
2011-11-19 8:59 ` Nai Xia
2011-11-19 9:48 ` Nai Xia
2011-11-21 11:19 ` Mel Gorman
2011-11-18 16:58 ` [PATCH 5/5] mm: compaction: make isolate_lru_page() filter-aware again Mel Gorman
2011-11-19 19:54 ` [RFC PATCH 0/5] Reduce compaction-related stalls Andrea Arcangeli
2011-11-19 19:54 ` [PATCH 1/8] mm: compaction: Allow compaction to isolate dirty pages Andrea Arcangeli
2011-11-19 19:54 ` [PATCH 2/8] mm: compaction: Use synchronous compaction for /proc/sys/vm/compact_memory Andrea Arcangeli
2011-11-19 19:54 ` [PATCH 3/8] mm: check if we isolated a compound page during lumpy scan Andrea Arcangeli
2011-11-21 11:51 ` Mel Gorman
2011-11-19 19:54 ` [PATCH 4/8] mm: compaction: defer compaction only with sync_migration Andrea Arcangeli
2011-11-21 12:36 ` Mel Gorman
2011-11-19 19:54 ` [PATCH 5/8] mm: compaction: avoid overwork in migrate sync mode Andrea Arcangeli
2011-11-21 21:59 ` Rik van Riel
2011-11-22 9:51 ` Mel Gorman
2011-11-19 19:54 ` [PATCH 6/8] Revert "mm: compaction: make isolate_lru_page() filter-aware" Andrea Arcangeli
2011-11-21 12:57 ` Mel Gorman
2011-11-19 19:54 ` [PATCH 7/8] Revert "vmscan: abort reclaim/compaction if compaction can proceed" Andrea Arcangeli
2011-11-21 13:09 ` Mel Gorman [this message]
2011-11-21 15:37 ` Rik van Riel
2011-11-19 19:54 ` [PATCH 8/8] Revert "vmscan: limit direct reclaim for higher order allocations" Andrea Arcangeli
2011-11-21 21:57 ` Rik van Riel
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