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Mon, 24 Jul 2023 12:17:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE84DC433C7; Mon, 24 Jul 2023 12:17:40 +0000 (UTC) Message-ID: <01e8445d033314b6d9cd67bece74ca1c3ce89945.camel@kernel.org> From: Jeff Layton To: Qi Zheng , 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 Date: Mon, 24 Jul 2023 08:17:39 -0400 In-Reply-To: <20230724094354.90817-35-zhengqi.arch@bytedance.com> References: <20230724094354.90817-1-zhengqi.arch@bytedance.com> <20230724094354.90817-35-zhengqi.arch@bytedance.com> User-Agent: Evolution 3.48.4 (3.48.4-1.fc38) MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 X-Mailman-Approved-At: Tue, 25 Jul 2023 06:42:42 +0000 Subject: Re: [dm-devel] [PATCH v2 34/47] nfsd: dynamically allocate the nfsd-client shrinker X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, dm-devel@redhat.com, linux-mtd@lists.infradead.org, x86@kernel.org, cluster-devel@redhat.com, xen-devel@lists.xenproject.org, linux-ext4@vger.kernel.org, linux-arm-msm@vger.kernel.org, rcu@vger.kernel.org, linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, Chuck Lever , linux-fsdevel@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-btrfs@vger.kernel.org Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Mon, 2023-07-24 at 17:43 +0800, Qi Zheng wrote: > In preparation for implementing lockless slab shrink, use new APIs to > dynamically allocate the nfsd-client 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 nfsd_net. > > Acked-by: Chuck Lever > Signed-off-by: Qi Zheng > --- > fs/nfsd/netns.h | 2 +- > fs/nfsd/nfs4state.c | 20 ++++++++++++-------- > 2 files changed, 13 insertions(+), 9 deletions(-) > > diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h > index ec49b200b797..f669444d5336 100644 > --- a/fs/nfsd/netns.h > +++ b/fs/nfsd/netns.h > @@ -195,7 +195,7 @@ struct nfsd_net { > int nfs4_max_clients; > > atomic_t nfsd_courtesy_clients; > - struct shrinker nfsd_client_shrinker; > + struct shrinker *nfsd_client_shrinker; > struct work_struct nfsd_shrinker_work; > }; > > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c > index 3339177f8e2f..c7a4616cd866 100644 > --- a/fs/nfsd/nfs4state.c > +++ b/fs/nfsd/nfs4state.c > @@ -4388,8 +4388,7 @@ static unsigned long > nfsd4_state_shrinker_count(struct shrinker *shrink, struct shrink_control *sc) > { > int count; > - struct nfsd_net *nn = container_of(shrink, > - struct nfsd_net, nfsd_client_shrinker); > + struct nfsd_net *nn = shrink->private_data; > > count = atomic_read(&nn->nfsd_courtesy_clients); > if (!count) > @@ -8125,12 +8124,17 @@ static int nfs4_state_create_net(struct net *net) > INIT_WORK(&nn->nfsd_shrinker_work, nfsd4_state_shrinker_worker); > get_net(net); > > - nn->nfsd_client_shrinker.scan_objects = nfsd4_state_shrinker_scan; > - nn->nfsd_client_shrinker.count_objects = nfsd4_state_shrinker_count; > - nn->nfsd_client_shrinker.seeks = DEFAULT_SEEKS; > - > - if (register_shrinker(&nn->nfsd_client_shrinker, "nfsd-client")) > + nn->nfsd_client_shrinker = shrinker_alloc(0, "nfsd-client"); > + if (!nn->nfsd_client_shrinker) > goto err_shrinker; > + > + nn->nfsd_client_shrinker->scan_objects = nfsd4_state_shrinker_scan; > + nn->nfsd_client_shrinker->count_objects = nfsd4_state_shrinker_count; > + nn->nfsd_client_shrinker->seeks = DEFAULT_SEEKS; > + nn->nfsd_client_shrinker->private_data = nn; > + > + shrinker_register(nn->nfsd_client_shrinker); > + > return 0; > > err_shrinker: > @@ -8228,7 +8232,7 @@ nfs4_state_shutdown_net(struct net *net) > struct list_head *pos, *next, reaplist; > struct nfsd_net *nn = net_generic(net, nfsd_net_id); > > - unregister_shrinker(&nn->nfsd_client_shrinker); > + shrinker_unregister(nn->nfsd_client_shrinker); > cancel_work(&nn->nfsd_shrinker_work); > cancel_delayed_work_sync(&nn->laundromat_work); > locks_end_grace(&nn->nfsd4_manager); Acked-by: Jeff Layton -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel