Compaction migratepages scanner calls update_pageblock_skip() for blocks where isolation failed. It currently does that also for blocks where no isolation was attempted because the skip bit was already set. This is wasteful, so this patch reuses the existing skipped_async_unsuitable flag to avoid setting the skip bit again.
Signed-off-by: Vlastimil Babka <[email protected]> --- mm/compaction.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/compaction.c b/mm/compaction.c index f0db73b..20a75ee 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -529,8 +529,10 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, int mt; last_pageblock_nr = pageblock_nr; - if (!isolation_suitable(cc, page)) + if (!isolation_suitable(cc, page)) { + skipped_async_unsuitable = true; goto next_pageblock; + } /* * For async migration, also only scan in MOVABLE -- 1.8.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
