diff options
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 159 |
1 files changed, 89 insertions, 70 deletions
diff --git a/mm/slub.c b/mm/slub.c index 57e5156f02be..1d3f9835f4ea 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1615,7 +1615,7 @@ out: if (!page) return NULL; - mod_zone_page_state(page_zone(page), + mod_lruvec_page_state(page, (s->flags & SLAB_RECLAIM_ACCOUNT) ? NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, 1 << oo_order(oo)); @@ -1655,7 +1655,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page) kmemcheck_free_shadow(page, compound_order(page)); - mod_zone_page_state(page_zone(page), + mod_lruvec_page_state(page, (s->flags & SLAB_RECLAIM_ACCOUNT) ? NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, -pages); @@ -1829,7 +1829,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, stat(s, CPU_PARTIAL_NODE); } if (!kmem_cache_has_cpu_partial(s) - || available > s->cpu_partial / 2) + || available > slub_cpu_partial(s) / 2) break; } @@ -1993,7 +1993,7 @@ static void init_kmem_cache_cpus(struct kmem_cache *s) * Remove the cpu slab */ static void deactivate_slab(struct kmem_cache *s, struct page *page, - void *freelist) + void *freelist, struct kmem_cache_cpu *c) { enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE }; struct kmem_cache_node *n = get_node(s, page_to_nid(page)); @@ -2132,6 +2132,9 @@ redo: discard_slab(s, page); stat(s, FREE_SLAB); } + + c->page = NULL; + c->freelist = NULL; } /* @@ -2266,11 +2269,9 @@ static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain) static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) { stat(s, CPUSLAB_FLUSH); - deactivate_slab(s, c->page, c->freelist); + deactivate_slab(s, c->page, c->freelist, c); c->tid = next_tid(c->tid); - c->page = NULL; - c->freelist = NULL; } /* @@ -2302,7 +2303,7 @@ static bool has_cpu_slab(int cpu, void *info) struct kmem_cache *s = info; struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); - return c->page || c->partial; + return c->page || slub_percpu_partial(c); } static void flush_all(struct kmem_cache *s) @@ -2521,9 +2522,7 @@ redo: if (unlikely(!node_match(page, searchnode))) { stat(s, ALLOC_NODE_MISMATCH); - deactivate_slab(s, page, c->freelist); - c->page = NULL; - c->freelist = NULL; + deactivate_slab(s, page, c->freelist, c); goto new_slab; } } @@ -2534,9 +2533,7 @@ redo: * information when the page leaves the per-cpu allocator */ if (unlikely(!pfmemalloc_match(page, gfpflags))) { - deactivate_slab(s, page, c->freelist); - c->page = NULL; - c->freelist = NULL; + deactivate_slab(s, page, c->freelist, c); goto new_slab; } @@ -2568,11 +2565,10 @@ load_freelist: new_slab: - if (c->partial) { - page = c->page = c->partial; - c->partial = page->next; + if (slub_percpu_partial(c)) { + page = c->page = slub_percpu_partial(c); + slub_set_percpu_partial(c, page); stat(s, CPU_PARTIAL_ALLOC); - c->freelist = NULL; goto redo; } @@ -2592,9 +2588,7 @@ new_slab: !alloc_debug_processing(s, page, freelist, addr)) goto new_slab; /* Slab failed checks. Next slab needed */ - deactivate_slab(s, page, get_freepointer(s, freelist)); - c->page = NULL; - c->freelist = NULL; + deactivate_slab(s, page, get_freepointer(s, freelist), c); return freelist; } @@ -3410,6 +3404,39 @@ static void set_min_partial(struct kmem_cache *s, unsigned long min) s->min_partial = min; } +static void set_cpu_partial(struct kmem_cache *s) +{ +#ifdef CONFIG_SLUB_CPU_PARTIAL + /* + * cpu_partial determined the maximum number of objects kept in the + * per cpu partial lists of a processor. + * + * Per cpu partial lists mainly contain slabs that just have one + * object freed. If they are used for allocation then they can be + * filled up again with minimal effort. The slab will never hit the + * per node partial lists and therefore no locking will be required. + * + * This setting also determines + * + * A) The number of objects from per cpu partial slabs dumped to the + * per node list when we reach the limit. + * B) The number of objects in cpu partial slabs to extract from the + * per node list when we run out of per cpu objects. We only fetch + * 50% to keep some capacity around for frees. + */ + if (!kmem_cache_has_cpu_partial(s)) + s->cpu_partial = 0; + else if (s->size >= PAGE_SIZE) + s->cpu_partial = 2; + else if (s->size >= 1024) + s->cpu_partial = 6; + else if (s->size >= 256) + s->cpu_partial = 13; + else + s->cpu_partial = 30; +#endif +} + /* * calculate_sizes() determines the order and the distribution of data within * a slab object. @@ -3568,33 +3595,7 @@ static int kmem_cache_open(struct kmem_cache *s, unsigned long flags) */ set_min_partial(s, ilog2(s->size) / 2); - /* - * cpu_partial determined the maximum number of objects kept in the - * per cpu partial lists of a processor. - * - * Per cpu partial lists mainly contain slabs that just have one - * object freed. If they are used for allocation then they can be - * filled up again with minimal effort. The slab will never hit the - * per node partial lists and therefore no locking will be required. - * - * This setting also determines - * - * A) The number of objects from per cpu partial slabs dumped to the - * per node list when we reach the limit. - * B) The number of objects in cpu partial slabs to extract from the - * per node list when we run out of per cpu objects. We only fetch - * 50% to keep some capacity around for frees. - */ - if (!kmem_cache_has_cpu_partial(s)) - s->cpu_partial = 0; - else if (s->size >= PAGE_SIZE) - s->cpu_partial = 2; - else if (s->size >= 1024) - s->cpu_partial = 6; - else if (s->size >= 256) - s->cpu_partial = 13; - else - s->cpu_partial = 30; + set_cpu_partial(s); #ifdef CONFIG_NUMA s->remote_node_defrag_ratio = 1000; @@ -3981,7 +3982,7 @@ void __kmemcg_cache_deactivate(struct kmem_cache *s) * Disable empty slabs caching. Used to avoid pinning offline * memory cgroups by kmem pages that can be freed. */ - s->cpu_partial = 0; + slub_set_cpu_partial(s, 0); s->min_partial = 0; /* @@ -4760,7 +4761,7 @@ static ssize_t show_slab_objects(struct kmem_cache *s, total += x; nodes[node] += x; - page = READ_ONCE(c->partial); + page = slub_percpu_partial_read_once(c); if (page) { node = page_to_nid(page); if (flags & SO_TOTAL) @@ -4921,7 +4922,7 @@ SLAB_ATTR(min_partial); static ssize_t cpu_partial_show(struct kmem_cache *s, char *buf) { - return sprintf(buf, "%u\n", s->cpu_partial); + return sprintf(buf, "%u\n", slub_cpu_partial(s)); } static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf, @@ -4936,7 +4937,7 @@ static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf, if (objects && !kmem_cache_has_cpu_partial(s)) return -EINVAL; - s->cpu_partial = objects; + slub_set_cpu_partial(s, objects); flush_all(s); return length; } @@ -4988,7 +4989,9 @@ static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf) int len; for_each_online_cpu(cpu) { - struct page *page = per_cpu_ptr(s->cpu_slab, cpu)->partial; + struct page *page; + + page = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu)); if (page) { pages += page->pages; @@ -5000,7 +5003,9 @@ static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf) #ifdef CONFIG_SMP for_each_online_cpu(cpu) { - struct page *page = per_cpu_ptr(s->cpu_slab, cpu) ->partial; + struct page *page; + + page = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu)); if (page && len < PAGE_SIZE - 20) len += sprintf(buf + len, " C%d=%d(%d)", cpu, @@ -5512,6 +5517,7 @@ static void memcg_propagate_slab_attrs(struct kmem_cache *s) char mbuf[64]; char *buf; struct slab_attribute *attr = to_slab_attr(slab_attrs[i]); + ssize_t len; if (!attr || !attr->store || !attr->show) continue; @@ -5536,8 +5542,9 @@ static void memcg_propagate_slab_attrs(struct kmem_cache *s) buf = buffer; } - attr->show(root_cache, buf); - attr->store(s, buf, strlen(buf)); + len = attr->show(root_cache, buf); + if (len > 0) + attr->store(s, buf, len); } if (buffer) @@ -5623,6 +5630,28 @@ static char *create_unique_id(struct kmem_cache *s) return name; } +static void sysfs_slab_remove_workfn(struct work_struct *work) +{ + struct kmem_cache *s = + container_of(work, struct kmem_cache, kobj_remove_work); + + if (!s->kobj.state_in_sysfs) + /* + * For a memcg cache, this may be called during + * deactivation and again on shutdown. Remove only once. + * A cache is never shut down before deactivation is + * complete, so no need to worry about synchronization. + */ + return; + +#ifdef CONFIG_MEMCG + kset_unregister(s->memcg_kset); +#endif + kobject_uevent(&s->kobj, KOBJ_REMOVE); + kobject_del(&s->kobj); + kobject_put(&s->kobj); +} + static int sysfs_slab_add(struct kmem_cache *s) { int err; @@ -5630,6 +5659,8 @@ static int sysfs_slab_add(struct kmem_cache *s) struct kset *kset = cache_kset(s); int unmergeable = slab_unmergeable(s); + INIT_WORK(&s->kobj_remove_work, sysfs_slab_remove_workfn); + if (!kset) { kobject_init(&s->kobj, &slab_ktype); return 0; @@ -5693,20 +5724,8 @@ static void sysfs_slab_remove(struct kmem_cache *s) */ return; - if (!s->kobj.state_in_sysfs) - /* - * For a memcg cache, this may be called during - * deactivation and again on shutdown. Remove only once. - * A cache is never shut down before deactivation is - * complete, so no need to worry about synchronization. - */ - return; - -#ifdef CONFIG_MEMCG - kset_unregister(s->memcg_kset); -#endif - kobject_uevent(&s->kobj, KOBJ_REMOVE); - kobject_del(&s->kobj); + kobject_get(&s->kobj); + schedule_work(&s->kobj_remove_work); } void sysfs_slab_release(struct kmem_cache *s) |