From patchwork Mon Jul 24 09:43:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13324268 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 51F02C001B0 for ; Mon, 24 Jul 2023 10:16:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233190AbjGXKQC (ORCPT ); Mon, 24 Jul 2023 06:16:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47268 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230357AbjGXKPr (ORCPT ); Mon, 24 Jul 2023 06:15:47 -0400 Received: from mail-qt1-x832.google.com (mail-qt1-x832.google.com [IPv6:2607:f8b0:4864:20::832]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ADC9244BE for ; Mon, 24 Jul 2023 03:07:30 -0700 (PDT) Received: by mail-qt1-x832.google.com with SMTP id d75a77b69052e-406966843bcso2634331cf.0 for ; Mon, 24 Jul 2023 03:07:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1690193242; x=1690798042; 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=PA74NunQFszlW8RpIb5KtNwL3Pn/7Z7EgMABUrgFylU=; b=DHCa3S2njdM4cRu4kJv8+XLd1OeNCtMrqbv0QAeqEfcQR7gPvM3otZgzt6gGPm+flh I7V6UZ8bXMhB/kSWYDDWHD3HKtJfZOQuGNvVmd7cdtfbW+pMh4tsrDUvy3wZF/GeQRBn eHbSBxDqecv9qyP6hMLlWLFjagPyECP8/Wc+GR8u6wXs0rHAnxN4o6PHNu/A7QWkD2Kv EKq1U9LjfiBYmbyr0ZH7/rwuW1/LcTwF9ocTl7xJHdl0qHSNj3DdsYjy/ABojrzYNxcy OnyXZBRcKYdoj+rmnb8Q2+Yg0rNFnHhJi+O1uzrRhv3vurjl3qUc1rkMYtIN1Uz/VpMX x/uQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690193242; x=1690798042; 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=PA74NunQFszlW8RpIb5KtNwL3Pn/7Z7EgMABUrgFylU=; b=XSEZFeTN53ERL+xZsBpGmecJTSCDxwuqqpnFsdH7zluQpreRjEhaXMmIsD3WpjXpMT rR+WifYmDqSzY/EdJD2221cLIeR8iAbq1+fOt3VGZh8YEzSZ+yWTtdrHmYv0VBIx8O2e gdwupgnOuLtvwDNETEqSPUzxSbGFa60apikK/Ac5Dli1fgLuBeTHuCxS+ykgR4ITWtJe vv32ZJo4ipRc062Zo1R4AUILhVVnAVdxLfPYPO1kPp5r2PQydam5VSVqXiPVAHqwPTUR Lgqn0Ls4QzZb8sZgqD/L3Oh+2Dl2nCevw8QOsyHfvphvKOnglFmPhpeQMa3e7UR3R080 y55Q== X-Gm-Message-State: ABy/qLYlFmKb60qjvG9cI7KP7O7eKbVdpa7BJ/sCjHYebfTsQRQQeS8/ AJngbNzlCl9x8WeNHYKxUwtpSLI4XqhbrsWpa0g= X-Google-Smtp-Source: APBJJlG2oOvKNbqCVYKCsLLrFI6N3Peh10WK+D3LiX3VUR0Gh2vD9sbZ8AKvOgxEZEiSv+Xi5/CKrg== X-Received: by 2002:a17:902:d4cb:b0:1b1:9272:55e2 with SMTP id o11-20020a170902d4cb00b001b1927255e2mr12377128plg.3.1690192313997; Mon, 24 Jul 2023 02:51:53 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.147]) by smtp.gmail.com with ESMTPSA id d5-20020a170902c18500b001bb20380bf2sm8467233pld.13.2023.07.24.02.51.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jul 2023 02:51:53 -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 Subject: [PATCH v2 34/47] nfsd: dynamically allocate the nfsd-client shrinker Date: Mon, 24 Jul 2023 17:43:41 +0800 Message-Id: <20230724094354.90817-35-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230724094354.90817-1-zhengqi.arch@bytedance.com> References: <20230724094354.90817-1-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. Acked-by: Chuck Lever Signed-off-by: Qi Zheng 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 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);