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mm, compaction: encapsulate resetting cached scanner positions

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Reseting the cached compaction scanner positions is now open-coded in
__reset_isolation_suitable() and compact_finished().  Encapsulate the
functionality in a new function reset_cached_positions().

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vlastimil Babka 2015-09-08 15:02:42 -07:00 committed by Linus Torvalds
parent f5f61a320b
commit 02333641e2
1 changed files with 10 additions and 6 deletions
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16
mm/compaction.c
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@ -207,6 +207,13 @@ static inline bool isolation_suitable(struct compact_control *cc,
return !get_pageblock_skip(page);
}
static void reset_cached_positions(struct zone *zone)
{
zone->compact_cached_migrate_pfn[0] = zone->zone_start_pfn;
zone->compact_cached_migrate_pfn[1] = zone->zone_start_pfn;
zone->compact_cached_free_pfn = zone_end_pfn(zone);
}
/*
* This function is called to clear all cached information on pageblocks that
* should be skipped for page isolation when the migrate and free page scanner
@ -218,9 +225,6 @@ static void __reset_isolation_suitable(struct zone *zone)
unsigned long end_pfn = zone_end_pfn(zone);
unsigned long pfn;
zone->compact_cached_migrate_pfn[0] = start_pfn;
zone->compact_cached_migrate_pfn[1] = start_pfn;
zone->compact_cached_free_pfn = end_pfn;
zone->compact_blockskip_flush = false;
/* Walk the zone and mark every pageblock as suitable for isolation */
@ -238,6 +242,8 @@ static void __reset_isolation_suitable(struct zone *zone)
clear_pageblock_skip(page);
}
reset_cached_positions(zone);
}
void reset_isolation_suitable(pg_data_t *pgdat)
@ -1160,9 +1166,7 @@ static int __compact_finished(struct zone *zone, struct compact_control *cc,
/* Compaction run completes if the migrate and free scanner meet */
if (compact_scanners_met(cc)) {
/* Let the next compaction start anew. */
zone->compact_cached_migrate_pfn[0] = zone->zone_start_pfn;
zone->compact_cached_migrate_pfn[1] = zone->zone_start_pfn;
zone->compact_cached_free_pfn = zone_end_pfn(zone);
reset_cached_positions(zone);
/*
* Mark that the PG_migrate_skip information should be cleared