diff options
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 9270a4370d54..03822f86f288 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2544,12 +2544,28 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc) unsigned long reclaimed; unsigned long scanned; - if (mem_cgroup_low(root, memcg)) { + switch (mem_cgroup_protected(root, memcg)) { + case MEMCG_PROT_MIN: + /* + * Hard protection. + * If there is no reclaimable memory, OOM. + */ + continue; + case MEMCG_PROT_LOW: + /* + * Soft protection. + * Respect the protection only as long as + * there is an unprotected supply + * of reclaimable memory from other cgroups. + */ if (!sc->memcg_low_reclaim) { sc->memcg_low_skipped = 1; continue; } memcg_memory_event(memcg, MEMCG_LOW); + break; + case MEMCG_PROT_NONE: + break; } reclaimed = sc->nr_reclaimed; @@ -3318,11 +3334,15 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) .may_unmap = 1, .may_swap = 1, }; + + __fs_reclaim_acquire(); + count_vm_event(PAGEOUTRUN); do { unsigned long nr_reclaimed = sc.nr_reclaimed; bool raise_priority = true; + bool ret; sc.reclaim_idx = classzone_idx; @@ -3395,7 +3415,10 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) wake_up_all(&pgdat->pfmemalloc_wait); /* Check if kswapd should be suspending */ - if (try_to_freeze() || kthread_should_stop()) + __fs_reclaim_release(); + ret = try_to_freeze(); + __fs_reclaim_acquire(); + if (ret || kthread_should_stop()) break; /* @@ -3412,6 +3435,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) out: snapshot_refaults(NULL, pgdat); + __fs_reclaim_release(); /* * Return the order kswapd stopped reclaiming at as * prepare_kswapd_sleep() takes it into account. If another caller @@ -3600,9 +3624,7 @@ kswapd_try_sleep: */ trace_mm_vmscan_kswapd_wake(pgdat->node_id, classzone_idx, alloc_order); - fs_reclaim_acquire(GFP_KERNEL); reclaim_order = balance_pgdat(pgdat, alloc_order, classzone_idx); - fs_reclaim_release(GFP_KERNEL); if (reclaim_order < alloc_order) goto kswapd_try_sleep; } @@ -3684,16 +3706,16 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim) unsigned long nr_reclaimed; unsigned int noreclaim_flag; - noreclaim_flag = memalloc_noreclaim_save(); fs_reclaim_acquire(sc.gfp_mask); + noreclaim_flag = memalloc_noreclaim_save(); reclaim_state.reclaimed_slab = 0; p->reclaim_state = &reclaim_state; nr_reclaimed = do_try_to_free_pages(zonelist, &sc); p->reclaim_state = NULL; - fs_reclaim_release(sc.gfp_mask); memalloc_noreclaim_restore(noreclaim_flag); + fs_reclaim_release(sc.gfp_mask); return nr_reclaimed; } @@ -3870,6 +3892,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in }; cond_resched(); + fs_reclaim_acquire(sc.gfp_mask); /* * We need to be able to allocate from the reserves for RECLAIM_UNMAP * and we also need to be able to write out pages for RECLAIM_WRITE @@ -3877,7 +3900,6 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in */ noreclaim_flag = memalloc_noreclaim_save(); p->flags |= PF_SWAPWRITE; - fs_reclaim_acquire(sc.gfp_mask); reclaim_state.reclaimed_slab = 0; p->reclaim_state = &reclaim_state; @@ -3892,9 +3914,9 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in } p->reclaim_state = NULL; - fs_reclaim_release(gfp_mask); current->flags &= ~PF_SWAPWRITE; memalloc_noreclaim_restore(noreclaim_flag); + fs_reclaim_release(sc.gfp_mask); return sc.nr_reclaimed >= nr_pages; } |