[PATCHv2] mm/compaction: reset compaction scanner positions
When the compaction is activated via /proc/sys/vm/compact_memory it would better scan the whole zone. And some platform, for instance ARM, has the start_pfn of a zone is zero. Therefore the first try to compaction via /proc doesn't work. It needs to force to reset compaction scanner position at first. Signed-off-by: Gioh Kim Acked-by: Vlastimil Babka Acked-by: David Rientjes --- mm/compaction.c |8 1 file changed, 8 insertions(+) diff --git a/mm/compaction.c b/mm/compaction.c index 8c0d945..ccf48ce 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1587,6 +1587,14 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc) INIT_LIST_HEAD(>freepages); INIT_LIST_HEAD(>migratepages); + /* +* When called via /proc/sys/vm/compact_memory +* this makes sure we compact the whole zone regardless of +* cached scanner positions. +*/ + if (cc->order == -1) + __reset_isolation_suitable(zone); + if (cc->order == -1 || !compaction_deferred(zone, cc->order)) compact_zone(zone, cc); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCHv2] mm/compaction: reset compaction scanner positions
When the compaction is activated via /proc/sys/vm/compact_memory it would better scan the whole zone. And some platform, for instance ARM, has the start_pfn of a zone is zero. Therefore the first try to compaction via /proc doesn't work. It needs to force to reset compaction scanner position at first. Signed-off-by: Gioh Kim gioh@lge.com Acked-by: Vlastimil Babka vba...@suse.cz Acked-by: David Rientjes rient...@google.com --- mm/compaction.c |8 1 file changed, 8 insertions(+) diff --git a/mm/compaction.c b/mm/compaction.c index 8c0d945..ccf48ce 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1587,6 +1587,14 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc) INIT_LIST_HEAD(cc-freepages); INIT_LIST_HEAD(cc-migratepages); + /* +* When called via /proc/sys/vm/compact_memory +* this makes sure we compact the whole zone regardless of +* cached scanner positions. +*/ + if (cc-order == -1) + __reset_isolation_suitable(zone); + if (cc-order == -1 || !compaction_deferred(zone, cc-order)) compact_zone(zone, cc); -- 1.7.9.5 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
