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Thu, 27 Jul 2023 02:17:49 -0700 (PDT) Received: from [10.70.252.135] ([203.208.167.147]) by smtp.gmail.com with ESMTPSA id x3-20020a170902ea8300b001b8c3c7b102sm1099792plb.127.2023.07.27.02.17.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Jul 2023 02:17:49 -0700 (PDT) Message-ID: Date: Thu, 27 Jul 2023 17:17:36 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH v3 34/49] ext4: dynamically allocate the ext4-es shrinker Content-Language: en-US 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, Muchun Song References: <20230727080502.77895-1-zhengqi.arch@bytedance.com> <20230727080502.77895-35-zhengqi.arch@bytedance.com> From: Qi Zheng In-Reply-To: <20230727080502.77895-35-zhengqi.arch@bytedance.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230727_021752_788681_918F42E1 X-CRM114-Status: GOOD ( 19.33 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On 2023/7/27 16:04, Qi Zheng wrote: > In preparation for implementing lockless slab shrink, use new APIs to > dynamically allocate the ext4-es 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 ext4_sb_info. > > Signed-off-by: Qi Zheng > Reviewed-by: Muchun Song > --- > fs/ext4/ext4.h | 2 +- > fs/ext4/extents_status.c | 22 ++++++++++++---------- > 2 files changed, 13 insertions(+), 11 deletions(-) > > diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h > index 1e2259d9967d..82397bf0b33e 100644 > --- a/fs/ext4/ext4.h > +++ b/fs/ext4/ext4.h > @@ -1657,7 +1657,7 @@ struct ext4_sb_info { > __u32 s_csum_seed; > > /* Reclaim extents from extent status tree */ > - struct shrinker s_es_shrinker; > + struct shrinker *s_es_shrinker; > struct list_head s_es_list; /* List of inodes with reclaimable extents */ > long s_es_nr_inode; > struct ext4_es_stats s_es_stats; > diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c > index 9b5b8951afb4..74bb64fadbc4 100644 > --- a/fs/ext4/extents_status.c > +++ b/fs/ext4/extents_status.c > @@ -1596,7 +1596,7 @@ static unsigned long ext4_es_count(struct shrinker *shrink, > unsigned long nr; > struct ext4_sb_info *sbi; > > - sbi = container_of(shrink, struct ext4_sb_info, s_es_shrinker); > + sbi = shrink->private_data; > nr = percpu_counter_read_positive(&sbi->s_es_stats.es_stats_shk_cnt); > trace_ext4_es_shrink_count(sbi->s_sb, sc->nr_to_scan, nr); > return nr; > @@ -1605,8 +1605,7 @@ static unsigned long ext4_es_count(struct shrinker *shrink, > static unsigned long ext4_es_scan(struct shrinker *shrink, > struct shrink_control *sc) > { > - struct ext4_sb_info *sbi = container_of(shrink, > - struct ext4_sb_info, s_es_shrinker); > + struct ext4_sb_info *sbi = shrink->private_data; > int nr_to_scan = sc->nr_to_scan; > int ret, nr_shrunk; > > @@ -1690,14 +1689,17 @@ int ext4_es_register_shrinker(struct ext4_sb_info *sbi) > if (err) > goto err3; > > - sbi->s_es_shrinker.scan_objects = ext4_es_scan; > - sbi->s_es_shrinker.count_objects = ext4_es_count; > - sbi->s_es_shrinker.seeks = DEFAULT_SEEKS; > - err = register_shrinker(&sbi->s_es_shrinker, "ext4-es:%s", > - sbi->s_sb->s_id); > - if (err) > + sbi->s_es_shrinker = shrinker_alloc(0, "ext4-es:%s", sbi->s_sb->s_id); > + if (!sbi->s_es_shrinker) Here should set err to -ENOMEM, will fix. > goto err4; > > + sbi->s_es_shrinker->scan_objects = ext4_es_scan; > + sbi->s_es_shrinker->count_objects = ext4_es_count; > + sbi->s_es_shrinker->seeks = DEFAULT_SEEKS; > + sbi->s_es_shrinker->private_data = sbi; > + > + shrinker_register(sbi->s_es_shrinker); > + > return 0; > err4: > percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt); > @@ -1716,7 +1718,7 @@ void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi) > percpu_counter_destroy(&sbi->s_es_stats.es_stats_cache_misses); > percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt); > percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt); > - unregister_shrinker(&sbi->s_es_shrinker); > + shrinker_free(sbi->s_es_shrinker); > } > > /* ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/