| Message ID | 1256221356-26049-4-git-send-email-mel@csn.ul.ie |
|---|---|
| State | Not Applicable, archived |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/mm/vmscan.c b/mm/vmscan.c index 64e4388..cd68109 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2016,6 +2016,15 @@ loop_again: priority != DEF_PRIORITY) continue; + /* + * Exit quickly to restart if it has been indicated + * that higher orders are required + */ + if (pgdat->kswapd_max_order > order) { + all_zones_ok = 1; + goto out; + } + if (!zone_watermark_ok(zone, order, high_wmark_pages(zone), end_zone, 0)) all_zones_ok = 0;
When a high-order allocation fails, kswapd is kicked so that it reclaims at a higher-order to avoid direct reclaimers stall and to help GFP_ATOMIC allocations. Something has changed in recent kernels that affect the timing where high-order GFP_ATOMIC allocations are now failing with more frequency, particularly under pressure. This patch forces kswapd to notice sooner that high-order allocations are occuring. Signed-off-by: Mel Gorman <mel@csn.ul.ie> --- mm/vmscan.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-)