From patchwork Thu Jun 22 08:53:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13288771 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 84A0FEB64DD for ; Thu, 22 Jun 2023 09:02:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231907AbjFVJCq (ORCPT ); Thu, 22 Jun 2023 05:02:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231769AbjFVJCB (ORCPT ); Thu, 22 Jun 2023 05:02:01 -0400 Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 93DF34228 for ; Thu, 22 Jun 2023 01:57:10 -0700 (PDT) Received: by mail-pl1-x631.google.com with SMTP id d9443c01a7336-1b693afe799so2466125ad.1 for ; Thu, 22 Jun 2023 01:57:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1687424203; x=1690016203; 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=uYJ0Isr1XZATX6JGPvTVuhl3oDZVpp/hY4/4gwVGW9E=; b=E8DR3f2Hoat1dr+eWUDbHZgFwAog/Y14Fyr901nadnjVcnG4wi/dzsYXue5lsR1fMf J4lGKXcngL6tZ98mDRA+meQDFEQqI8M8C2U7Jzsh+P5pb02lqX9x9oPIGG3MqGtcEQBd gtcaY6d5Wvcszm2wAYU1/GbNiI4/W6jf6+osdVtp14uPtbwdSj3xBB3cuLupxVd/0Bva 3aNVjboq1g3R8QF56ponf3Z0k9HzBLbK6msqxIkke8ZOuuk+1QHFYDcPM2BRj2r4DT2+ yfbsCvnlQ4hLgF8msig/7Mg+peyLnaUmJHbCBGncbsN2mdvtqIXKdXSMs3btfn7dPCo7 J6Zg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687424203; x=1690016203; 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=uYJ0Isr1XZATX6JGPvTVuhl3oDZVpp/hY4/4gwVGW9E=; b=CDy87mCRa2YR6+zT6svy5h+0Zt3UThtJmohCm9NeCIau3z2eshH6mEA9Lv2+utMxMk v+WK+psw7N5C6ZPjO/8f9kZUbfLk2K3p5M3RuH+rHKn5G1DH9Brw4BYju6LlYmfnZ3DR uBsYB/Pk7ExvxLovP6xDk+mfzuuYPiBqZ8VxHaaReReY9gQo/wMSaW21xxG11PFXgOaj nA/0YjGdqHGsg8zJdcZ9iwM4NCTcjIfk0jxbVNFbbPvu3md/AnbkpNIfT1ZkPniqs224 o4JFz5YhRlcs7tsMIl7Ihw/taL6Ox9qGCO6XBn7kQhj5XdPNHXRClyYs7enRYPokQftr Kqlw== X-Gm-Message-State: AC+VfDw66KiiGy/mBLwG75/NS24i8VjXTt0QTdY1F84VRntjLL7dzzZY wuvPClp0JiQx9Supw9iYwZxadA== X-Google-Smtp-Source: ACHHUZ4t5WHqyo4ZYahXOm5IhQBts9kOj8de1dBmPyGeGIdQ3YL7Www59M51QQRN7AwqoJV6XrQ1Ww== X-Received: by 2002:a17:902:ea01:b0:1a9:6467:aa8d with SMTP id s1-20020a170902ea0100b001a96467aa8dmr21674286plg.1.1687424203648; Thu, 22 Jun 2023 01:56:43 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([139.177.225.254]) by smtp.gmail.com with ESMTPSA id h2-20020a170902f7c200b001b549fce345sm4806971plw.230.2023.06.22.01.56.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Jun 2023 01:56:43 -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 Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, intel-gfx@lists.freedesktop.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-nfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, Qi Zheng Subject: [PATCH 20/29] zsmalloc: dynamically allocate the mm-zspool shrinker Date: Thu, 22 Jun 2023 16:53:26 +0800 Message-Id: <20230622085335.77010-21-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230622085335.77010-1-zhengqi.arch@bytedance.com> References: <20230622085335.77010-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org In preparation for implementing lockless slab shrink, we need 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 --- mm/zsmalloc.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 3f057970504e..c03b34ae637e 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; @@ -2107,8 +2107,7 @@ 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. @@ -2126,8 +2125,7 @@ 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]; @@ -2142,18 +2140,24 @@ static unsigned long zs_shrinker_count(struct shrinker *shrinker, static void zs_unregister_shrinker(struct zs_pool *pool) { - unregister_shrinker(&pool->shrinker); + unregister_and_free_shrinker(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; + int ret; + + pool->shrinker = shrinker_alloc_and_init(zs_shrinker_count, + zs_shrinker_scan, 0, + DEFAULT_SEEKS, 0, pool); + if (!pool->shrinker) + return -ENOMEM; - return register_shrinker(&pool->shrinker, "mm-zspool:%s", - pool->name); + ret = register_shrinker(pool->shrinker, "mm-zspool:%s", pool->name); + if (ret) + shrinker_free(pool->shrinker); + + return ret; } static int calculate_zspage_chain_size(int class_size)