diff options
Diffstat (limited to 'mm/swap_slots.c')
| -rw-r--r-- | mm/swap_slots.c | 78 |
1 files changed, 10 insertions, 68 deletions
diff --git a/mm/swap_slots.c b/mm/swap_slots.c index 13ab3b771409..9c7c171df7ba 100644 --- a/mm/swap_slots.c +++ b/mm/swap_slots.c @@ -43,17 +43,15 @@ static DEFINE_MUTEX(swap_slots_cache_mutex); /* Serialize swap slots cache enable/disable operations */ static DEFINE_MUTEX(swap_slots_cache_enable_mutex); -static void __drain_swap_slots_cache(unsigned int type); +static void __drain_swap_slots_cache(void); #define use_swap_slot_cache (swap_slot_cache_active && swap_slot_cache_enabled) -#define SLOTS_CACHE 0x1 -#define SLOTS_CACHE_RET 0x2 static void deactivate_swap_slots_cache(void) { mutex_lock(&swap_slots_cache_mutex); swap_slot_cache_active = false; - __drain_swap_slots_cache(SLOTS_CACHE|SLOTS_CACHE_RET); + __drain_swap_slots_cache(); mutex_unlock(&swap_slots_cache_mutex); } @@ -72,7 +70,7 @@ void disable_swap_slots_cache_lock(void) if (swap_slot_cache_initialized) { /* serialize with cpu hotplug operations */ cpus_read_lock(); - __drain_swap_slots_cache(SLOTS_CACHE|SLOTS_CACHE_RET); + __drain_swap_slots_cache(); cpus_read_unlock(); } } @@ -113,7 +111,7 @@ out: static int alloc_swap_slot_cache(unsigned int cpu) { struct swap_slots_cache *cache; - swp_entry_t *slots, *slots_ret; + swp_entry_t *slots; /* * Do allocation outside swap_slots_cache_mutex @@ -125,28 +123,19 @@ static int alloc_swap_slot_cache(unsigned int cpu) if (!slots) return -ENOMEM; - slots_ret = kvcalloc(SWAP_SLOTS_CACHE_SIZE, sizeof(swp_entry_t), - GFP_KERNEL); - if (!slots_ret) { - kvfree(slots); - return -ENOMEM; - } - mutex_lock(&swap_slots_cache_mutex); cache = &per_cpu(swp_slots, cpu); - if (cache->slots || cache->slots_ret) { + if (cache->slots) { /* cache already allocated */ mutex_unlock(&swap_slots_cache_mutex); kvfree(slots); - kvfree(slots_ret); return 0; } if (!cache->lock_initialized) { mutex_init(&cache->alloc_lock); - spin_lock_init(&cache->free_lock); cache->lock_initialized = true; } cache->nr = 0; @@ -160,19 +149,16 @@ static int alloc_swap_slot_cache(unsigned int cpu) */ mb(); cache->slots = slots; - cache->slots_ret = slots_ret; mutex_unlock(&swap_slots_cache_mutex); return 0; } -static void drain_slots_cache_cpu(unsigned int cpu, unsigned int type, - bool free_slots) +static void drain_slots_cache_cpu(unsigned int cpu, bool free_slots) { struct swap_slots_cache *cache; - swp_entry_t *slots = NULL; cache = &per_cpu(swp_slots, cpu); - if ((type & SLOTS_CACHE) && cache->slots) { + if (cache->slots) { mutex_lock(&cache->alloc_lock); swapcache_free_entries(cache->slots + cache->cur, cache->nr); cache->cur = 0; @@ -183,20 +169,9 @@ static void drain_slots_cache_cpu(unsigned int cpu, unsigned int type, } mutex_unlock(&cache->alloc_lock); } - if ((type & SLOTS_CACHE_RET) && cache->slots_ret) { - spin_lock_irq(&cache->free_lock); - swapcache_free_entries(cache->slots_ret, cache->n_ret); - cache->n_ret = 0; - if (free_slots && cache->slots_ret) { - slots = cache->slots_ret; - cache->slots_ret = NULL; - } - spin_unlock_irq(&cache->free_lock); - kvfree(slots); - } } -static void __drain_swap_slots_cache(unsigned int type) +static void __drain_swap_slots_cache(void) { unsigned int cpu; @@ -224,13 +199,13 @@ static void __drain_swap_slots_cache(unsigned int type) * There are no slots on such cpu that need to be drained. */ for_each_online_cpu(cpu) - drain_slots_cache_cpu(cpu, type, false); + drain_slots_cache_cpu(cpu, false); } static int free_slot_cache(unsigned int cpu) { mutex_lock(&swap_slots_cache_mutex); - drain_slots_cache_cpu(cpu, SLOTS_CACHE | SLOTS_CACHE_RET, true); + drain_slots_cache_cpu(cpu, true); mutex_unlock(&swap_slots_cache_mutex); return 0; } @@ -269,39 +244,6 @@ static int refill_swap_slots_cache(struct swap_slots_cache *cache) return cache->nr; } -void free_swap_slot(swp_entry_t entry) -{ - struct swap_slots_cache *cache; - - /* Large folio swap slot is not covered. */ - zswap_invalidate(entry); - - cache = raw_cpu_ptr(&swp_slots); - if (likely(use_swap_slot_cache && cache->slots_ret)) { - spin_lock_irq(&cache->free_lock); - /* Swap slots cache may be deactivated before acquiring lock */ - if (!use_swap_slot_cache || !cache->slots_ret) { - spin_unlock_irq(&cache->free_lock); - goto direct_free; - } - if (cache->n_ret >= SWAP_SLOTS_CACHE_SIZE) { - /* - * Return slots to global pool. - * The current swap_map value is SWAP_HAS_CACHE. - * Set it to 0 to indicate it is available for - * allocation in global pool - */ - swapcache_free_entries(cache->slots_ret, cache->n_ret); - cache->n_ret = 0; - } - cache->slots_ret[cache->n_ret++] = entry; - spin_unlock_irq(&cache->free_lock); - } else { -direct_free: - swapcache_free_entries(&entry, 1); - } -} - swp_entry_t folio_alloc_swap(struct folio *folio) { swp_entry_t entry; |