From patchwork Thu Jul 27 08:04:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13329679 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 C2FFDC04FDF for ; Thu, 27 Jul 2023 08:30:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234309AbjG0Ia3 (ORCPT ); Thu, 27 Jul 2023 04:30:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234332AbjG0I2B (ORCPT ); Thu, 27 Jul 2023 04:28:01 -0400 Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 145DE83E8 for ; Thu, 27 Jul 2023 01:14:47 -0700 (PDT) Received: by mail-pf1-x433.google.com with SMTP id d2e1a72fcca58-6862d4a1376so189792b3a.0 for ; Thu, 27 Jul 2023 01:14:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1690445649; x=1691050449; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=sPvPF+4cfnCSPpn5pwfgQmnhLHHD8eUNQAmayNodhE0=; b=YUtSHImzHFhUVx7c3A38/9eSWP8Y2UYGj1FAohSpraRjdigKG79oH7xXGVv/st6Oxo VyXpyLT7a2poDQM1BLbe2YZ2f+F4NjGwYTjXKgOmjtdNRT3EltoPRUERX0NGCPGwABx/ guLbSxl8SczSn7UsZFsKIT2jSYiALWPELONV4dGxl+BgYW8LTo4BMAXY89ObnQ5bwB+z TeqwZ6TJLFD7PjgbTEQMgvSuaTCzQbN9MksnEsjGQ7GcxsQYflnPZl/UkK6mnnTiCX+x HfuT7U9+62kKpSnlvuoFhz2dd+gEGZ79L6Z5RTD7Q/dArvGRObCoRNap6LnHLL+kySjl YAWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690445649; x=1691050449; 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=sPvPF+4cfnCSPpn5pwfgQmnhLHHD8eUNQAmayNodhE0=; b=PliOiblt6+p8CJrUnlyp8G5aDUfXftyObj1cN5WSscwk12r0p9AOT5G8JeVOCaqA6h roSOlbi5Oko4nDEqg/sLW6lQheyj9TFTf6dbFlo16e8VP+gjUZhsWll5X8voqfXFbSM/ ILULeNwVULOh3i1wixN8Q8u6rr3kBgQ2bzmHUEvhPjURYLqaEc3C85L7Ig9CTZaiKX76 eYcgrF6i/b4gA5YEyHfneP1Ioz+40XFWE1pXIu4WjxLdVJCT3JBydKctkhdKIAOVIliR yFu6cSU+EgHNyz2rMAXjAmsQz9nOapHhkz4/R3cSBqwA/Vd4tDbg/IlB1TLAhu+WF+wc FzJA== X-Gm-Message-State: ABy/qLYS/7icpVE28+LNsog0jQ64c7OSWM/uAg1MUqBmzbScf4/gLel+ 5ileKdlkKrzwqsRprKAojdTKdg== X-Google-Smtp-Source: APBJJlHWG/nG8cYGh+bA6ihiUuY1h+OmDGzY+AfGFIW0cwXlJC7qa3aS8ftT4KQ6i8EuYK6gaQtAEg== X-Received: by 2002:a05:6a20:918e:b0:11a:dbb3:703b with SMTP id v14-20020a056a20918e00b0011adbb3703bmr5557054pzd.6.1690445649366; Thu, 27 Jul 2023 01:14:09 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.147]) by smtp.gmail.com with ESMTPSA id j8-20020aa78d08000000b006828e49c04csm885872pfe.75.2023.07.27.01.13.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Jul 2023 01:14:08 -0700 (PDT) From: Qi Zheng To: akpm@linux-foundation.org, david@fromorbit.com, tkhai@ya.ru, vbabka@suse.cz, roman.gushchin@linux.dev, djwong@kernel.org, brauner@kernel.org, paulmck@kernel.org, tytso@mit.edu, steven.price@arm.com, cel@kernel.org, senozhatsky@chromium.org, yujie.liu@intel.com, gregkh@linuxfoundation.org, muchun.song@linux.dev Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, linux-erofs@lists.ozlabs.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-nfs@vger.kernel.org, linux-mtd@lists.infradead.org, rcu@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, linux-bcache@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, Qi Zheng , Muchun Song Subject: [PATCH v3 41/49] zsmalloc: dynamically allocate the mm-zspool shrinker Date: Thu, 27 Jul 2023 16:04:54 +0800 Message-Id: <20230727080502.77895-42-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230727080502.77895-1-zhengqi.arch@bytedance.com> References: <20230727080502.77895-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In preparation for implementing lockless slab shrink, use new APIs to dynamically allocate the mm-zspool shrinker, so that it can be freed asynchronously using kfree_rcu(). Then it doesn't need to wait for RCU read-side critical section when releasing the struct zs_pool. Signed-off-by: Qi Zheng Reviewed-by: Muchun Song --- mm/zsmalloc.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index b96230402a8d..e63302e07c97 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -229,7 +229,7 @@ struct zs_pool { struct zs_pool_stats stats; /* Compact classes */ - struct shrinker shrinker; + struct shrinker *shrinker; #ifdef CONFIG_ZSMALLOC_STAT struct dentry *stat_dentry; @@ -2086,8 +2086,7 @@ static unsigned long zs_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) { unsigned long pages_freed; - struct zs_pool *pool = container_of(shrinker, struct zs_pool, - shrinker); + struct zs_pool *pool = shrinker->private_data; /* * Compact classes and calculate compaction delta. @@ -2105,8 +2104,7 @@ static unsigned long zs_shrinker_count(struct shrinker *shrinker, int i; struct size_class *class; unsigned long pages_to_free = 0; - struct zs_pool *pool = container_of(shrinker, struct zs_pool, - shrinker); + struct zs_pool *pool = shrinker->private_data; for (i = ZS_SIZE_CLASSES - 1; i >= 0; i--) { class = pool->size_class[i]; @@ -2121,18 +2119,24 @@ static unsigned long zs_shrinker_count(struct shrinker *shrinker, static void zs_unregister_shrinker(struct zs_pool *pool) { - unregister_shrinker(&pool->shrinker); + shrinker_free(pool->shrinker); } static int zs_register_shrinker(struct zs_pool *pool) { - pool->shrinker.scan_objects = zs_shrinker_scan; - pool->shrinker.count_objects = zs_shrinker_count; - pool->shrinker.batch = 0; - pool->shrinker.seeks = DEFAULT_SEEKS; + pool->shrinker = shrinker_alloc(0, "mm-zspool:%s", pool->name); + if (!pool->shrinker) + return -ENOMEM; + + pool->shrinker->scan_objects = zs_shrinker_scan; + pool->shrinker->count_objects = zs_shrinker_count; + pool->shrinker->batch = 0; + pool->shrinker->seeks = DEFAULT_SEEKS; + pool->shrinker->private_data = pool; - return register_shrinker(&pool->shrinker, "mm-zspool:%s", - pool->name); + shrinker_register(pool->shrinker); + + return 0; } static int calculate_zspage_chain_size(int class_size)