From patchwork Thu Feb 23 16:43:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Breno Leitao X-Patchwork-Id: 13150584 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1EDAEC6379F for ; Thu, 23 Feb 2023 16:44:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234635AbjBWQoX (ORCPT ); Thu, 23 Feb 2023 11:44:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44644 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234026AbjBWQoX (ORCPT ); Thu, 23 Feb 2023 11:44:23 -0500 Received: from mail-wr1-f42.google.com (mail-wr1-f42.google.com [209.85.221.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EBFC639CD4; Thu, 23 Feb 2023 08:44:21 -0800 (PST) Received: by mail-wr1-f42.google.com with SMTP id j2so10990011wrh.9; Thu, 23 Feb 2023 08:44:21 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=+k0d3ITubH2glaeJAp2cfaEZXtQloEAVR31lcQ0bITk=; b=QlBPgV3u59OIN4TN6/CCgtQNRFPZhpiFaAhJ2/VczU9uZlblr1x7kJncMuRYoMWAUz e6dadVz/ncEOn/QbV0oQRQN7pTjaEoX7h2I5p3gM6OQfMC8iVQlpElqA4l4q39xrqtEi QLDBt6/6N+741jKJCe+Svf69qt6ilGbWp2BuYGdl3GKUSs5bl50SyEk/HsyIDNXV7kcD 4csb1Kagp60HLc29eWJ/CqEARf+6q+tVdecRt9hoM0rxz3fbuonNFOKqXQDwUga6izN8 HhVOGrKLbPB+JuP78CaHE7pWvOWT0f8j1rsdBt5GZ5j4tjk0yQ45K90J5tZvNfML4nge vqXg== X-Gm-Message-State: AO0yUKUVwyhXgcrWy1zvMTW2Mc1Q6MN6gcrebfiJmbk8gWoWuxRXdKbZ cJEbx/Uq2eFyX9i2jn38jbI= X-Google-Smtp-Source: AK7set9or6tnEjqY7bfp0bHKqbcrDxOf+chBbk8OwIg3pk6Fk+KvJYh0Z7u9ZT8gfGp+xotO5ajMoQ== X-Received: by 2002:a5d:51ca:0:b0:2c7:1159:ea43 with SMTP id n10-20020a5d51ca000000b002c71159ea43mr2492370wrv.51.1677170660333; Thu, 23 Feb 2023 08:44:20 -0800 (PST) Received: from localhost (fwdproxy-cln-008.fbsv.net. [2a03:2880:31ff:8::face:b00c]) by smtp.gmail.com with ESMTPSA id v26-20020a5d591a000000b002c573cff730sm7700970wrd.68.2023.02.23.08.44.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Feb 2023 08:44:19 -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, kasan-dev@googlegroups.com Subject: [PATCH v3 1/2] io_uring: Move from hlist to io_wq_work_node Date: Thu, 23 Feb 2023 08:43:52 -0800 Message-Id: <20230223164353.2839177-2-leitao@debian.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230223164353.2839177-1-leitao@debian.org> References: <20230223164353.2839177-1-leitao@debian.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: io-uring@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 | 24 +++++++++++++----------- 2 files changed, 14 insertions(+), 12 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..301855e94309 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 +23,12 @@ 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; + if (cache->list.next) { + struct io_cache_entry *entry; - hlist_del(node); - return container_of(node, struct io_cache_entry, node); + entry = container_of(cache->list.next, struct io_cache_entry, node); + cache->list.next = cache->list.next->next; + return entry; } return NULL; @@ -35,18 +36,19 @@ 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; + while (1) { + struct io_cache_entry *entry = io_alloc_cache_get(cache); - hlist_del(node); - free(container_of(node, struct io_cache_entry, node)); + if (!entry) + break; + free(entry); } cache->nr_cached = 0; }