diff options
| author | Weijie Yang <weijie.yang@samsung.com> | 2014-04-07 15:37:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-07 16:35:50 -0700 |
| commit | 9bbc04eeb01fcb5c20bb10f34989665df7200163 (patch) | |
| tree | bafb3ff4118bb08c96f2a584c6cdee59aa873a4d | |
| parent | 619d0d76c1ee943f171c7d4fc021ec7602388579 (diff) | |
mm/vmscan: do not check compaction_ready on promoted zones
We abort direct reclaim if we find the zone is ready for compaction.
Sometimes the zone is just a promoted highmem zone to force a scan of
highmem, which is not the intended zone the caller want to allocate a
page from. In this situation, setting aborted_reclaim to indicate the
caller turned back to retry the allocation is waste of time and could
cause a loop in __alloc_pages_slowpath().
This patch does not check compaction_ready() on promoted zones to avoid
the above situation. Only set aborted_reclaim if the caller intended
zone is ready for compaction.
Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/vmscan.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 1c51e4f52fd9..06879ead7380 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2318,6 +2318,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc) struct shrink_control shrink = { .gfp_mask = sc->gfp_mask, }; + enum zone_type requested_highidx = gfp_zone(sc->gfp_mask); /* * If the number of buffer_heads in the machine exceeds the maximum @@ -2358,7 +2359,8 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc) * noticeable problem, like transparent huge * page allocations. */ - if (compaction_ready(zone, sc)) { + if ((zonelist_zone_idx(z) <= requested_highidx) + && compaction_ready(zone, sc)) { aborted_reclaim = true; continue; } |