Subject: + mm-compaction-cleanup-isolate_freepages.patch added to -mm tree
To: vbabka@xxxxxxx,b.zolnierkie@xxxxxxxxxxx,cl@xxxxxxxxx,d.j.shin@xxxxxxxxxxx,iamjoonsoo.kim@xxxxxxx,mgorman@xxxxxxx,mina86@xxxxxxxxxx,minchan@xxxxxxxxxx,n-horiguchi@xxxxxxxxxxxxx,riel@xxxxxxxxxx,sunghwan.yun@xxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 21 Apr 2014 12:41:55 -0700
The patch titled
Subject: mm/compaction: cleanup isolate_freepages()
has been added to the -mm tree. Its filename is
mm-compaction-cleanup-isolate_freepages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-compaction-cleanup-isolate_freepages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-compaction-cleanup-isolate_freepages.patch
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------------------------------------------------------
From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm/compaction: cleanup isolate_freepages()
isolate_freepages() is currently somewhat hard to follow thanks to many
looks like it is related to the 'low_pfn' variable, but in fact it is not.
This patch renames the 'high_pfn' variable to a hopefully less confusing name,
and slightly changes its handling without a functional change. A comment made
obsolete by recent changes is also updated.
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Cc: Michal Nazarewicz <mina86@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Dongjun Shin <d.j.shin@xxxxxxxxxxx>
Cc: Sunghwan Yun <sunghwan.yun@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff -puN mm/compaction.c~mm-compaction-cleanup-isolate_freepages mm/compaction.c
--- a/mm/compaction.c~mm-compaction-cleanup-isolate_freepages
+++ a/mm/compaction.c
@@ -662,7 +662,7 @@ static void isolate_freepages(struct zon
struct compact_control *cc)
{
struct page *page;
- unsigned long high_pfn, low_pfn, pfn, z_end_pfn;
+ unsigned long pfn, low_pfn, next_free_pfn, z_end_pfn;
int nr_freepages = cc->nr_freepages;
struct list_head *freelist = &cc->freepages;
@@ -679,11 +679,10 @@ static void isolate_freepages(struct zon
low_pfn = ALIGN(cc->migrate_pfn + 1, pageblock_nr_pages);
/*
- * Take care that if the migration scanner is at the end of the zone
- * that the free scanner does not accidentally move to the next zone
- * in the next isolation cycle.
+ * Seed the value for max(next_free_pfn, pfn) updates. If there are
+ * none, the pfn < low_pfn check will kick in.
*/
- high_pfn = min(low_pfn, pfn);
+ next_free_pfn = 0;
z_end_pfn = zone_end_pfn(zone);
@@ -744,7 +743,7 @@ static void isolate_freepages(struct zon
*/
if (isolated) {
cc->finished_update_free = true;
- high_pfn = max(high_pfn, pfn);
+ next_free_pfn = max(next_free_pfn, pfn);
}
}
@@ -756,9 +755,9 @@ static void isolate_freepages(struct zon
* so that compact_finished() may detect this
*/
if (pfn < low_pfn)
- cc->free_pfn = max(pfn, zone->zone_start_pfn);
- else
- cc->free_pfn = high_pfn;
+ next_free_pfn = max(pfn, zone->zone_start_pfn);
+
+ cc->free_pfn = next_free_pfn;
cc->nr_freepages = nr_freepages;
}
_
Patches currently in -mm which might be from vbabka@xxxxxxx are
mm-compaction-make-isolate_freepages-start-at-pageblock-boundary.patch
mm-compactionc-isolate_freepages_block-small-tuneup.patch
mm-page_alloc-prevent-migrate_reserve-pages-from-being-misplaced.patch
mm-page_alloc-debug_vm-checks-for-free_list-placement-of-cma-and-reserve-pages.patch
mm-compaction-clean-up-unused-code-lines.patch
mm-compaction-cleanup-isolate_freepages.patch
mm-compaction-cleanup-isolate_freepages-fix.patch
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