diff options
Diffstat (limited to 'mm/compaction.c')
| -rw-r--r-- | mm/compaction.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index b918bdb28aed..0409a4ad6ea1 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1435,9 +1435,14 @@ enum compact_result compaction_suitable(struct zone *zone, int order, * index towards 0 implies failure is due to lack of memory * index towards 1000 implies failure is due to fragmentation * - * Only compact if a failure would be due to fragmentation. + * Only compact if a failure would be due to fragmentation. Also + * ignore fragindex for non-costly orders where the alternative to + * a successful reclaim/compaction is OOM. Fragindex and the + * vm.extfrag_threshold sysctl is meant as a heuristic to prevent + * excessive compaction for costly orders, but it should not be at the + * expense of system stability. */ - if (ret == COMPACT_CONTINUE) { + if (ret == COMPACT_CONTINUE && (order > PAGE_ALLOC_COSTLY_ORDER)) { fragindex = fragmentation_index(zone, order); if (fragindex >= 0 && fragindex <= sysctl_extfrag_threshold) ret = COMPACT_NOT_SUITABLE_ZONE; |