mm/zswap: invalidate zswap entry when swap entry free
During testing I found there are some times the zswap_writeback_entry() return -ENOMEM, which is not we expected: bpftrace -e 'kr:zswap_writeback_entry {@[(int32)retval]=count()}' @[-12]: 1563 @[0]: 277221 The reason is that __read_swap_cache_async() return NULL because swapcache_prepare() failed. The reason is that we won't invalidate zswap entry when swap entry freed to the per-cpu pool, these zswap entries are still on the zswap tree and lru list. This patch moves the invalidation ahead to when swap entry freed to the per-cpu pool, since there is no any benefit to leave trashy zswap entry on the tree and lru list. With this patch: bpftrace -e 'kr:zswap_writeback_entry {@[(int32)retval]=count()}' @[0]: 259744 Note: large folio can't have zswap entry for now, so don't bother to add zswap entry invalidation in the large folio swap free path. Link: https://lkml.kernel.org/r/20240201-b4-zswap-invalidate-entry-v2-2-99d4084260a0@bytedance.com Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> Reviewed-by: Nhat Pham <nphamcs@gmail.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Yosry Ahmed <yosryahmed@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -29,7 +29,7 @@ struct zswap_lruvec_state {
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bool zswap_store(struct folio *folio);
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bool zswap_store(struct folio *folio);
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bool zswap_load(struct folio *folio);
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bool zswap_load(struct folio *folio);
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void zswap_invalidate(int type, pgoff_t offset);
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void zswap_invalidate(swp_entry_t swp);
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int zswap_swapon(int type, unsigned long nr_pages);
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int zswap_swapon(int type, unsigned long nr_pages);
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void zswap_swapoff(int type);
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void zswap_swapoff(int type);
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void zswap_memcg_offline_cleanup(struct mem_cgroup *memcg);
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void zswap_memcg_offline_cleanup(struct mem_cgroup *memcg);
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@ -50,7 +50,7 @@ static inline bool zswap_load(struct folio *folio)
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return false;
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return false;
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}
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}
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static inline void zswap_invalidate(int type, pgoff_t offset) {}
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static inline void zswap_invalidate(swp_entry_t swp) {}
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static inline int zswap_swapon(int type, unsigned long nr_pages)
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static inline int zswap_swapon(int type, unsigned long nr_pages)
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{
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{
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return 0;
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return 0;
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@ -273,6 +273,9 @@ void free_swap_slot(swp_entry_t entry)
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{
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{
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struct swap_slots_cache *cache;
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struct swap_slots_cache *cache;
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/* Large folio swap slot is not covered. */
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zswap_invalidate(entry);
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cache = raw_cpu_ptr(&swp_slots);
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cache = raw_cpu_ptr(&swp_slots);
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if (likely(use_swap_slot_cache && cache->slots_ret)) {
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if (likely(use_swap_slot_cache && cache->slots_ret)) {
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spin_lock_irq(&cache->free_lock);
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spin_lock_irq(&cache->free_lock);
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@ -744,7 +744,6 @@ static void swap_range_free(struct swap_info_struct *si, unsigned long offset,
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swap_slot_free_notify = NULL;
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swap_slot_free_notify = NULL;
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while (offset <= end) {
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while (offset <= end) {
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arch_swap_invalidate_page(si->type, offset);
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arch_swap_invalidate_page(si->type, offset);
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zswap_invalidate(si->type, offset);
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if (swap_slot_free_notify)
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if (swap_slot_free_notify)
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swap_slot_free_notify(si->bdev, offset);
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swap_slot_free_notify(si->bdev, offset);
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offset++;
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offset++;
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@ -1739,9 +1739,10 @@ bool zswap_load(struct folio *folio)
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return true;
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return true;
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}
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}
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void zswap_invalidate(int type, pgoff_t offset)
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void zswap_invalidate(swp_entry_t swp)
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{
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{
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struct zswap_tree *tree = swap_zswap_tree(swp_entry(type, offset));
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pgoff_t offset = swp_offset(swp);
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struct zswap_tree *tree = swap_zswap_tree(swp);
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struct zswap_entry *entry;
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struct zswap_entry *entry;
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spin_lock(&tree->lock);
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spin_lock(&tree->lock);
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