From patchwork Mon Aug 7 11:09:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13343915 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 C91C4C001DF for ; Mon, 7 Aug 2023 11:32:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232880AbjHGLco (ORCPT ); Mon, 7 Aug 2023 07:32:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232798AbjHGLcS (ORCPT ); Mon, 7 Aug 2023 07:32:18 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E226E59D0 for ; Mon, 7 Aug 2023 04:29:10 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id d2e1a72fcca58-6874a386ec7so819686b3a.1 for ; Mon, 07 Aug 2023 04:29:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1691407680; x=1692012480; 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=xVRvDV5EwClRaurogoo7jeCmWiPiam6NNimoVigpYsU=; b=Ce/ClG561+eyFkWYWJgO4+lO7MP2azPoQonUpzU3SACwchvJrj026TERY/ty9SFao4 FK6cjh3x3NQ7ORFBsxzaVBw3HOLwt5Gd7i0mAQ7qxZWlI+di9KBRP04S8TWE8Mnh1qKo Bcog+RhXscw4jDI9O4Bcl3DquFGVIHcsAXbQBuPZ/QmLU+IS2h+f4P6oALqwcKp5BNKo bJ9gl/XnsyfJro5t6C5XDB5ule7bjxmYm8Y+1i27R22e090zml0OYkCbf4RbRF7mE0pF CQZlFO0u1j7Dak6LNQxArZnaGto0jG4WENpCtsFMFEq42q74XzrIL/an8JAsqEFj89LB dP8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691407680; x=1692012480; 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=xVRvDV5EwClRaurogoo7jeCmWiPiam6NNimoVigpYsU=; b=ImWw/Q8C7q5rM1ll11fzy9RxXb5A1qBzbAMIerKuUmL9tFxKysp/K84ozFL4oQmRs1 af51DUD4lBg0OoyB40WqPyioWqsSzz5ieL419DKGUsA1ZzjZoGKXyGKS7eE7ClUj/C6g ZsaHkitN4h8dgBxTYj+YMlQw0IMqUsXRc4WdXtJ4vjCuhA/pZTs0uD0+QDNHD7s3LKPs 2bFOIz2Vm4/VLY8wJSbkS1EHrWcYxe477+c3+xIjzoldnPpnGpzgcKW9pbhYbh8J9/pX uizMLUdLrg5OaRwwGER3UfFIo4LJuQsRf57Ty+4Mt19F1cX/qSeNL0K3SmsG6tO5P0s7 3fSw== X-Gm-Message-State: AOJu0Yzlrj1DsD3dXiqi+aus2ik6/XpdEr84PF1th8RbIMwXmS11TIo8 oRNePjp0wHoL2ynJ1DpVES5xB4PupTBX8en7jyE= X-Google-Smtp-Source: APBJJlGBV531Fc0h3gGTcYh+GrDchiBvn4r3DyO1GlE79UVq2Tiyx2gaPN4S9h+mnuBR5bsUMtGvYQ== X-Received: by 2002:a17:90a:ac2:b0:268:f977:848c with SMTP id r2-20020a17090a0ac200b00268f977848cmr15219032pje.2.1691407007341; Mon, 07 Aug 2023 04:16:47 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.146]) by smtp.gmail.com with ESMTPSA id y13-20020a17090aca8d00b0025be7b69d73sm5861191pjt.12.2023.08.07.04.16.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Aug 2023 04:16:47 -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, simon.horman@corigine.com, dlemoal@kernel.org 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 v4 32/48] mbcache: dynamically allocate the mbcache shrinker Date: Mon, 7 Aug 2023 19:09:20 +0800 Message-Id: <20230807110936.21819-33-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230807110936.21819-1-zhengqi.arch@bytedance.com> References: <20230807110936.21819-1-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 mbcache 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 mb_cache. Signed-off-by: Qi Zheng Reviewed-by: Muchun Song --- fs/mbcache.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/fs/mbcache.c b/fs/mbcache.c index 2a4b8b549e93..0d1e24e9a5e3 100644 --- a/fs/mbcache.c +++ b/fs/mbcache.c @@ -37,7 +37,7 @@ struct mb_cache { struct list_head c_list; /* Number of entries in cache */ unsigned long c_entry_count; - struct shrinker c_shrink; + struct shrinker *c_shrink; /* Work for shrinking when the cache has too many entries */ struct work_struct c_shrink_work; }; @@ -293,8 +293,7 @@ EXPORT_SYMBOL(mb_cache_entry_touch); static unsigned long mb_cache_count(struct shrinker *shrink, struct shrink_control *sc) { - struct mb_cache *cache = container_of(shrink, struct mb_cache, - c_shrink); + struct mb_cache *cache = shrink->private_data; return cache->c_entry_count; } @@ -333,8 +332,7 @@ static unsigned long mb_cache_shrink(struct mb_cache *cache, static unsigned long mb_cache_scan(struct shrinker *shrink, struct shrink_control *sc) { - struct mb_cache *cache = container_of(shrink, struct mb_cache, - c_shrink); + struct mb_cache *cache = shrink->private_data; return mb_cache_shrink(cache, sc->nr_to_scan); } @@ -377,15 +375,20 @@ struct mb_cache *mb_cache_create(int bucket_bits) for (i = 0; i < bucket_count; i++) INIT_HLIST_BL_HEAD(&cache->c_hash[i]); - cache->c_shrink.count_objects = mb_cache_count; - cache->c_shrink.scan_objects = mb_cache_scan; - cache->c_shrink.seeks = DEFAULT_SEEKS; - if (register_shrinker(&cache->c_shrink, "mbcache-shrinker")) { + cache->c_shrink = shrinker_alloc(0, "mbcache-shrinker"); + if (!cache->c_shrink) { kfree(cache->c_hash); kfree(cache); goto err_out; } + cache->c_shrink->count_objects = mb_cache_count; + cache->c_shrink->scan_objects = mb_cache_scan; + cache->c_shrink->seeks = DEFAULT_SEEKS; + cache->c_shrink->private_data = cache; + + shrinker_register(cache->c_shrink); + INIT_WORK(&cache->c_shrink_work, mb_cache_shrink_worker); return cache; @@ -406,7 +409,7 @@ void mb_cache_destroy(struct mb_cache *cache) { struct mb_cache_entry *entry, *next; - unregister_shrinker(&cache->c_shrink); + shrinker_free(cache->c_shrink); /* * We don't bother with any locking. Cache must not be used at this