Zone reclaim is similar to direct reclaim in a number of respects. PF_SWAPWRITE is used by kswapd to avoid a write-congestion check but it's set also set for zone_reclaim which is inappropriate. Setting it potentially allows zone_reclaim users to cause large IO stalls which is worse than remote memory accesses. Signed-off-by: Mel Gorman <mgorman@xxxxxxx> --- mm/vmscan.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 4f49535..ebef213 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3063,7 +3063,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) * and we also need to be able to write out pages for RECLAIM_WRITE * and RECLAIM_SWAP. */ - p->flags |= PF_MEMALLOC | PF_SWAPWRITE; + p->flags |= PF_MEMALLOC; lockdep_set_current_reclaim_state(gfp_mask); reclaim_state.reclaimed_slab = 0; p->reclaim_state = &reclaim_state; @@ -3116,7 +3116,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) } p->reclaim_state = NULL; - current->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE); + current->flags &= ~PF_MEMALLOC; lockdep_clear_current_reclaim_state(); return sc.nr_reclaimed >= nr_pages; } -- 1.7.3.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>