Re: [PATCH 4/6] Revert "mm: have order > 0 compaction start off where it left"

[PATCH 0/6] Reduce compaction scanning and lock contention · Mel Gorman <mgorman@suse.de> · 2012-09-20
[PATCH 1/6] mm: compaction: Abort compaction loop if lock is contended or run too long · Mel Gorman <mgorman@suse.de> · 2012-09-20
Re: [PATCH 1/6] mm: compaction: Abort compaction loop if lock is contended or run too long · Rik van Riel <hidden> · 2012-09-20
[PATCH 6/6] mm: compaction: Restart compaction from near where it left off · Mel Gorman <mgorman@suse.de> · 2012-09-20
Re: [PATCH 6/6] mm: compaction: Restart compaction from near where it left off · Rik van Riel <hidden> · 2012-09-20
[PATCH 5/6] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Mel Gorman <mgorman@suse.de> · 2012-09-20
Re: [PATCH 5/6] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Rik van Riel <hidden> · 2012-09-20
[PATCH 4/6] Revert "mm: have order > 0 compaction start off where it left" · Mel Gorman <mgorman@suse.de> · 2012-09-20
Re: [PATCH 4/6] Revert "mm: have order > 0 compaction start off where it left" · Rik van Riel <hidden> · 2012-09-20
[PATCH 3/6] mm: compaction: Acquire the zone->lock as late as possible · Mel Gorman <mgorman@suse.de> · 2012-09-20
Re: [PATCH 3/6] mm: compaction: Acquire the zone->lock as late as possible · Rik van Riel <hidden> · 2012-09-20
[PATCH 2/6] mm: compaction: Acquire the zone->lru_lock as late as possible · Mel Gorman <mgorman@suse.de> · 2012-09-20
Re: [PATCH 2/6] mm: compaction: Acquire the zone->lru_lock as late as possible · Rik van Riel <hidden> · 2012-09-20
Re: [PATCH 0/6] Reduce compaction scanning and lock contention · Richard Davies <hidden> · 2012-09-21
Re: [PATCH 0/6] Reduce compaction scanning and lock contention · Richard Davies <hidden> · 2012-09-21
Re: [PATCH 0/6] Reduce compaction scanning and lock contention · Richard Davies <hidden> · 2012-09-21
Re: [PATCH 0/6] Reduce compaction scanning and lock contention · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 0/6] Reduce compaction scanning and lock contention · Richard Davies <hidden> · 2012-09-21
Re: [PATCH 0/6] Reduce compaction scanning and lock contention · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 0/6] Reduce compaction scanning and lock contention · Richard Davies <hidden> · 2012-09-21

From: Rik van Riel <hidden>
Date: 2012-09-20 18:56:55
Also in: linux-mm, lkml, qemu-devel

On 09/20/2012 10:04 AM, Mel Gorman wrote:

This reverts commit 7db8889a (mm: have order > 0 compaction start off
where it left) and commit de74f1cc (mm: have order > 0 compaction start
near a pageblock with free pages). These patches were a good idea and
tests confirmed that they massively reduced the amount of scanning but
the implementation is complex and tricky to understand. A later patch
will cache what pageblocks should be skipped and reimplements the
concept of compact_cached_free_pfn on top for both migration and
free scanners.

Signed-off-by: Mel Gorman <mgorman@suse.de>

Sure, it makes your next patches easier...

Acked-by: Rik van Riel <redacted>

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