diff options
| -rw-r--r-- | include/linux/mmzone.h | 8 | ||||
| -rw-r--r-- | mm/vmscan.c | 23 |
2 files changed, 21 insertions, 10 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 9011505e740d..4c4522a51a3b 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -351,6 +351,12 @@ static inline void zone_set_flag(struct zone *zone, zone_flags_t flag) { set_bit(flag, &zone->flags); } + +static inline int zone_test_and_set_flag(struct zone *zone, zone_flags_t flag) +{ + return test_and_set_bit(flag, &zone->flags); +} + static inline void zone_clear_flag(struct zone *zone, zone_flags_t flag) { clear_bit(flag, &zone->flags); @@ -360,10 +366,12 @@ static inline int zone_is_all_unreclaimable(const struct zone *zone) { return test_bit(ZONE_ALL_UNRECLAIMABLE, &zone->flags); } + static inline int zone_is_reclaim_locked(const struct zone *zone) { return test_bit(ZONE_RECLAIM_LOCKED, &zone->flags); } + static inline int zone_is_oom_locked(const struct zone *zone) { return test_bit(ZONE_OOM_LOCKED, &zone->flags); diff --git a/mm/vmscan.c b/mm/vmscan.c index d8893dc2d4eb..e1471385d001 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1108,8 +1108,6 @@ static unsigned long shrink_zone(int priority, struct zone *zone, unsigned long nr_to_scan; unsigned long nr_reclaimed = 0; - zone_set_flag(zone, ZONE_RECLAIM_LOCKED); - /* * Add one to `nr_to_scan' just to make sure that the kernel will * slowly sift through the active list. @@ -1148,8 +1146,6 @@ static unsigned long shrink_zone(int priority, struct zone *zone, } throttle_vm_writeout(sc->gfp_mask); - - zone_clear_flag(zone, ZONE_RECLAIM_LOCKED); return nr_reclaimed; } @@ -1900,6 +1896,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) { int node_id; + int ret; /* * Zone reclaim reclaims unmapped file backed pages and @@ -1917,13 +1914,13 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) <= zone->min_slab_pages) return 0; + if (zone_is_all_unreclaimable(zone)) + return 0; + /* - * Avoid concurrent zone reclaims, do not reclaim in a zone that does - * not have reclaimable pages and if we should not delay the allocation - * then do not scan. + * Do not scan if the allocation should not be delayed. */ - if (!(gfp_mask & __GFP_WAIT) || zone_is_all_unreclaimable(zone) || - zone_is_reclaim_locked(zone) || (current->flags & PF_MEMALLOC)) + if (!(gfp_mask & __GFP_WAIT) || (current->flags & PF_MEMALLOC)) return 0; /* @@ -1935,6 +1932,12 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) node_id = zone_to_nid(zone); if (node_state(node_id, N_CPU) && node_id != numa_node_id()) return 0; - return __zone_reclaim(zone, gfp_mask, order); + + if (zone_test_and_set_flag(zone, ZONE_RECLAIM_LOCKED)) + return 0; + ret = __zone_reclaim(zone, gfp_mask, order); + zone_clear_flag(zone, ZONE_RECLAIM_LOCKED); + + return ret; } #endif |