[merged mm-stable] mm-compaction-skip-fast-freepages-isolation-if-enough-freepages-are-isolated.patch removed from -mm tree

[merged mm-stable] mm-compaction-skip-fast-freepages-isolation-if-enough-freepages-are-isolated.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: compaction: skip fast freepages isolation if enough freepages are isolated
has been removed from the -mm tree.  Its filename was
     mm-compaction-skip-fast-freepages-isolation-if-enough-freepages-are-isolated.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Baolin Wang <baolin.wang@linux.alibaba.com>
Subject: mm: compaction: skip fast freepages isolation if enough freepages are isolated
Date: Thu, 25 May 2023 20:54:01 +0800

I've observed that fast isolation often isolates more pages than
cc->migratepages, and the excess freepages will be released back to the
buddy system.  So skip fast freepages isolation if enough freepages are
isolated to save some CPU cycles.

Link: https://lkml.kernel.org/r/f39c2c07f2dba2732fd9c0843572e5bef96f7f67.1685018752.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/compaction.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/mm/compaction.c~mm-compaction-skip-fast-freepages-isolation-if-enough-freepages-are-isolated
+++ a/mm/compaction.c
@@ -1528,6 +1528,10 @@ static void fast_isolate_freepages(struc
 
 		spin_unlock_irqrestore(&cc->zone->lock, flags);
 
+		/* Skip fast search if enough freepages isolated */
+		if (cc->nr_freepages >= cc->nr_migratepages)
+			break;
+
 		/*
 		 * Smaller scan on next order so the total scan is related
 		 * to freelist_scan_limit.
_

Patches currently in -mm which might be from baolin.wang@linux.alibaba.com are