From patchwork Thu Jun 22 08:53:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13288714 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 98CEDEB64DB for ; Thu, 22 Jun 2023 08:57:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231555AbjFVI5p (ORCPT ); Thu, 22 Jun 2023 04:57:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37652 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231610AbjFVIzu (ORCPT ); Thu, 22 Jun 2023 04:55:50 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5E989210D for ; Thu, 22 Jun 2023 01:55:15 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id d9443c01a7336-1b693afe799so2464565ad.1 for ; Thu, 22 Jun 2023 01:55:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1687424115; x=1690016115; 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=9Gb8UpD3lZt4bh5cbhFKOyQevww2sfofkVlmbPNwxg8=; b=D5LVC+4HokJCz4FPeXcY+dsaTssife3Qqo2QFad+aTpXncu7uEYIb5Esgo0X9193yq JD9ShpMbmoNV55hSp3a3PNB6eqKE4aEEgjXjfXMhn0CWCq43W/gk5ji4OA6QFiz5YEbm Of780eCZQIl3oU3nzqHMjitXTfpqsvwkQAoJ3/aSYN48pFnlXdDicr+5TJONhzqSsJ8t IgcwK0tiB9rdlMicFxhfFEkVC1N5FWb0hV5n3c+iSTxmBlXa0ZlHHEAwcq0BLcrHgmll f7y7d2fR0/LzWuGi/rCVXp+lACayEzs+7pdEprt9XcBuFLw9Vycb7reaOybOjmFS0TWh I1Bg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687424115; x=1690016115; 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=9Gb8UpD3lZt4bh5cbhFKOyQevww2sfofkVlmbPNwxg8=; b=WostlrR50KPEB2nCcruZKVXsAtNzd6D+1Cf7aOVQsjN0C5FSoHcnaBIIA8dTv0D8K+ BzfqJ4gJVYAvgX0HYSQUSkK0jn59jaVAqodlGrybtJ1urbbfcZIBky3LldfCK28gqfi3 gjwbw7kTTL1wIUwQictN2xtP+klrO609jIlmeAXp0ryvgyrrd/iPSSLJuQ/96JV955iN TO2Y8sl0+LUuhHCSKsFcoLOTrmGOGOJZZOgjRbyK2ElKh6kgPxYWdt2OojY9AZHq6u3S DDBapw3mZ+VEc7Tzgnhg0KzWc3ievLB2s1pRDVRCmOI90CTZxfgfssMPRs8G4x4uOKVW DXjA== X-Gm-Message-State: AC+VfDzzUAuIRkwPq4FwQ61RGf71gBdfTtwTanuUd99xj25YB7wU+S6D g/17+jHr5IF/2uesBx85Jdgo3g== X-Google-Smtp-Source: ACHHUZ4eMYIbb4I7cyZSyRLa7A39+u7jKZFqr72/TYsRg3oKUy2dca/PQ8JGq6DHBe5p8nrFI+JLcw== X-Received: by 2002:a17:903:2451:b0:1b0:34c6:3bf2 with SMTP id l17-20020a170903245100b001b034c63bf2mr21539426pls.5.1687424114850; Thu, 22 Jun 2023 01:55:14 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([139.177.225.254]) by smtp.gmail.com with ESMTPSA id h2-20020a170902f7c200b001b549fce345sm4806971plw.230.2023.06.22.01.55.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Jun 2023 01:55:14 -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 09/29] bcache: dynamically allocate the md-bcache shrinker Date: Thu, 22 Jun 2023 16:53:15 +0800 Message-Id: <20230622085335.77010-10-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 md-bcache 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 cache_set. Signed-off-by: Qi Zheng --- drivers/md/bcache/bcache.h | 2 +- drivers/md/bcache/btree.c | 23 ++++++++++++++--------- drivers/md/bcache/sysfs.c | 2 +- 3 files changed, 16 insertions(+), 11 deletions(-) diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h index 700dc5588d5f..53c73b372e7a 100644 --- a/drivers/md/bcache/bcache.h +++ b/drivers/md/bcache/bcache.h @@ -541,7 +541,7 @@ struct cache_set { struct bio_set bio_split; /* For the btree cache */ - struct shrinker shrink; + struct shrinker *shrink; /* For the btree cache and anything allocation related */ struct mutex bucket_lock; diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index 569f48958bde..1131ae91f62a 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -667,7 +667,7 @@ static int mca_reap(struct btree *b, unsigned int min_order, bool flush) static unsigned long bch_mca_scan(struct shrinker *shrink, struct shrink_control *sc) { - struct cache_set *c = container_of(shrink, struct cache_set, shrink); + struct cache_set *c = shrink->private_data; struct btree *b, *t; unsigned long i, nr = sc->nr_to_scan; unsigned long freed = 0; @@ -734,7 +734,7 @@ static unsigned long bch_mca_scan(struct shrinker *shrink, static unsigned long bch_mca_count(struct shrinker *shrink, struct shrink_control *sc) { - struct cache_set *c = container_of(shrink, struct cache_set, shrink); + struct cache_set *c = shrink->private_data; if (c->shrinker_disabled) return 0; @@ -752,8 +752,8 @@ void bch_btree_cache_free(struct cache_set *c) closure_init_stack(&cl); - if (c->shrink.list.next) - unregister_shrinker(&c->shrink); + if (c->shrink->list.next) + unregister_and_free_shrinker(c->shrink); mutex_lock(&c->bucket_lock); @@ -828,14 +828,19 @@ int bch_btree_cache_alloc(struct cache_set *c) c->verify_data = NULL; #endif - c->shrink.count_objects = bch_mca_count; - c->shrink.scan_objects = bch_mca_scan; - c->shrink.seeks = 4; - c->shrink.batch = c->btree_pages * 2; + c->shrink = shrinker_alloc_and_init(bch_mca_count, bch_mca_scan, + c->btree_pages * 2, 4, 0, c); + if (!c->shrink) { + pr_warn("bcache: %s: could not allocate shrinker\n", + __func__); + return -ENOMEM; + } - if (register_shrinker(&c->shrink, "md-bcache:%pU", c->set_uuid)) + if (register_shrinker(c->shrink, "md-bcache:%pU", c->set_uuid)) { pr_warn("bcache: %s: could not register shrinker\n", __func__); + shrinker_free(c->shrink); + } return 0; } diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index c6f677059214..771577581f52 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -866,7 +866,7 @@ STORE(__bch_cache_set) sc.gfp_mask = GFP_KERNEL; sc.nr_to_scan = strtoul_or_return(buf); - c->shrink.scan_objects(&c->shrink, &sc); + c->shrink->scan_objects(c->shrink, &sc); } sysfs_strtoul_clamp(congested_read_threshold_us,