From patchwork Thu Jul 27 08:04:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13329642 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 6948CC001E0 for ; Thu, 27 Jul 2023 08:27:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234088AbjG0I0x (ORCPT ); Thu, 27 Jul 2023 04:26:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34734 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232215AbjG0I0Y (ORCPT ); Thu, 27 Jul 2023 04:26:24 -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 7D25D4689 for ; Thu, 27 Jul 2023 01:14:07 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id d2e1a72fcca58-66d6a9851f3so168617b3a.0 for ; Thu, 27 Jul 2023 01:14:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1690445588; x=1691050388; 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=SQyM2U1mZ/Gwc1nAOvYev1L9XLZmdJlRT0RgZ5HuwGo=; b=kd6rt5g6FvxszAExAWwDvnGLZ3nlFI6+LjpyYA2SwsBpfxyntyz5JxeLs4IsuFoqam BPrbW0IZbPo4bp5jr8CP6dW+kXsV2/xzlGqHNQMPkgHqzMSniXcziiHnCVK42nJM1noq S50aGwia7MX8euX+8hfeRRERjX2qwSrJrcd+yJ4VULel6DaWSf6W0hZ/qFtzG1N+JN0n uQB95m4CN8ZeNY7Xsu+pZiPFb9O3G4aVUw6FAsCxKpZx+yuB9vunfivBBZ8XUQHuWQvc AX+QkUyO8AP8Aa2+4wftvFDhdV62VUn8gnj7NjCNsCf/vREHbdt8IjenIeReKEgqNeKN BvoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690445588; x=1691050388; 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=SQyM2U1mZ/Gwc1nAOvYev1L9XLZmdJlRT0RgZ5HuwGo=; b=Y9yLmXy33OfBwxic3k4BmM+p1ionuk7ipDuO/+q+NHJchRP6AxHSzbZyAyHjzFpaaL gwzXAcaBpny3Jyf/uI8evYp+Bt5tbDsCP8TRTlHlyn1BiVWI97TlDQka4x5KEnrLG3Dm uerd/3sQSogjksbWcy87joZTbdRbQn0sjtW2uvwm1WWVOxZhZn2Pd1Ts8D7r/6FQvCWs OIusiqPgdsPPtx2BpHg38FHsox2rFxFyuRX4go6rd+X+ifK+9yYKeU1xWYcx0o8Fn44e ntkUL9RpQFRPn7vFOjsMB73ItvgxFxlcnQbmnchDvJ4290Wjr1aq9vJihU7+Cmk0JMlw t6sQ== X-Gm-Message-State: ABy/qLY5PvFTYYF8u42Dl+qk3J0uDzNhBfSKVLw8r4Hb21rBPuJlwLiY iEshOLA89l8lAdsmnkGw1BTuhA== X-Google-Smtp-Source: APBJJlGx3t3etMepgJMVu+n+Us77oI88lCmbMpzaxwGd8c6y1MJ13X5vnrHVztpBTHVV1RS/gpzzOQ== X-Received: by 2002:a05:6a21:3281:b0:137:514a:982d with SMTP id yt1-20020a056a21328100b00137514a982dmr6062167pzb.6.1690445588272; Thu, 27 Jul 2023 01:13:08 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.147]) by smtp.gmail.com with ESMTPSA id j8-20020aa78d08000000b006828e49c04csm885872pfe.75.2023.07.27.01.12.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Jul 2023 01:13:07 -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 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 , Chuck Lever , Jeff Layton Subject: [PATCH v3 36/49] nfsd: dynamically allocate the nfsd-client shrinker Date: Thu, 27 Jul 2023 16:04:49 +0800 Message-Id: <20230727080502.77895-37-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230727080502.77895-1-zhengqi.arch@bytedance.com> References: <20230727080502.77895-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org 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. Signed-off-by: Qi Zheng Acked-by: Chuck Lever Acked-by: Jeff Layton --- 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 ef7118ebee00..75334a43ded4 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) @@ -8123,12 +8122,17 @@ 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: @@ -8226,7 +8230,7 @@ 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_free(nn->nfsd_client_shrinker); cancel_work(&nn->nfsd_shrinker_work); cancel_delayed_work_sync(&nn->laundromat_work); locks_end_grace(&nn->nfsd4_manager);