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[2a03:2880:31ff:8::face:b00c]) by smtp.gmail.com with ESMTPSA id h7-20020a5d6887000000b002c5501a5803sm2715946wru.65.2023.02.21.05.57.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Feb 2023 05:57:38 -0800 (PST) From: Breno Leitao To: axboe@kernel.dk, asml.silence@gmail.com, io-uring@vger.kernel.org Cc: linux-kernel@vger.kernel.org, gustavold@meta.com, leit@meta.com Subject: [PATCH 1/2] io_uring: Move from hlist to io_wq_work_node Date: Tue, 21 Feb 2023 05:57:20 -0800 Message-Id: <20230221135721.3230763-1-leitao@debian.org> X-Mailer: git-send-email 2.39.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Having cache entries linked using the hlist format brings no benefit, and also requires an unnecessary extra pointer address per cache entry. Use the internal io_wq_work_node single-linked list for the internal alloc caches (async_msghdr and async_poll) This is required to be able to use KASAN on cache entries, since we do not need to touch unused (and poisoned) cache entries when adding more entries to the list. Suggested-by: Pavel Begunkov Signed-off-by: Breno Leitao --- include/linux/io_uring_types.h | 2 +- io_uring/alloc_cache.h | 27 +++++++++++++++------------ 2 files changed, 16 insertions(+), 13 deletions(-) diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index 0efe4d784358..efa66b6c32c9 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -188,7 +188,7 @@ struct io_ev_fd { }; struct io_alloc_cache { - struct hlist_head list; + struct io_wq_work_node list; unsigned int nr_cached; }; diff --git a/io_uring/alloc_cache.h b/io_uring/alloc_cache.h index 729793ae9712..0d9ff9402a37 100644 --- a/io_uring/alloc_cache.h +++ b/io_uring/alloc_cache.h @@ -7,7 +7,7 @@ #define IO_ALLOC_CACHE_MAX 512 struct io_cache_entry { - struct hlist_node node; + struct io_wq_work_node node; }; static inline bool io_alloc_cache_put(struct io_alloc_cache *cache, @@ -15,7 +15,7 @@ static inline bool io_alloc_cache_put(struct io_alloc_cache *cache, { if (cache->nr_cached < IO_ALLOC_CACHE_MAX) { cache->nr_cached++; - hlist_add_head(&entry->node, &cache->list); + wq_stack_add_head(&entry->node, &cache->list); return true; } return false; @@ -23,11 +23,14 @@ static inline bool io_alloc_cache_put(struct io_alloc_cache *cache, static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *cache) { - if (!hlist_empty(&cache->list)) { - struct hlist_node *node = cache->list.first; - - hlist_del(node); - return container_of(node, struct io_cache_entry, node); + struct io_wq_work_node *node; + struct io_cache_entry *entry; + + if (cache->list.next) { + node = cache->list.next; + entry = container_of(node, struct io_cache_entry, node); + cache->list.next = node->next; + return entry; } return NULL; @@ -35,19 +38,19 @@ static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *c static inline void io_alloc_cache_init(struct io_alloc_cache *cache) { - INIT_HLIST_HEAD(&cache->list); + cache->list.next = NULL; cache->nr_cached = 0; } static inline void io_alloc_cache_free(struct io_alloc_cache *cache, void (*free)(struct io_cache_entry *)) { - while (!hlist_empty(&cache->list)) { - struct hlist_node *node = cache->list.first; + struct io_cache_entry *entry; - hlist_del(node); - free(container_of(node, struct io_cache_entry, node)); + while ((entry = io_alloc_cache_get(cache))) { + free(entry); } + cache->nr_cached = 0; } #endif -- 2.39.0