From patchwork Mon Jul 24 09:43:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13324241 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 A953FC001DE for ; Mon, 24 Jul 2023 10:16:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231519AbjGXKQ6 (ORCPT ); Mon, 24 Jul 2023 06:16:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230153AbjGXKQ3 (ORCPT ); Mon, 24 Jul 2023 06:16:29 -0400 Received: from mail-qk1-x735.google.com (mail-qk1-x735.google.com [IPv6:2607:f8b0:4864:20::735]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5135A4C0F for ; Mon, 24 Jul 2023 03:08:30 -0700 (PDT) Received: by mail-qk1-x735.google.com with SMTP id af79cd13be357-767b9cb3d3aso51666085a.1 for ; Mon, 24 Jul 2023 03:08:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1690193306; x=1690798106; 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=oVZBD26n61nILm1319d0FZlD/fP50Fwp7YtrZB2yUEw=; b=abqKqPkuDdJHpiBp/BZs+GPzI4zf9AA2hMXx59yIpDnHHsECS4iGtNJUB625tqgPW5 hH/LD1lb66uJfeW3AxpaTrtOc02kYjzx0Mx5GSoJ9nwq9RBnmBphkMOFITkapoy4no/a cUgY21hX3Gsa/HTqtbfTJXk/lxWDbqWejyNA2QQ/OPBqcHIcyLyNnvq6oVUsi/VgPXOy iaTRBbFiCSFzhVLjSK3gIh7XzxXDPQB/8qPmmx05InbVzBHAlwNPXZ18Jk3BP6hx7QuR oq7AeUWI5pydAC2yhngwb1XtfrQHIAEchLqY1Upqpv7Pwgn898b7OA4a+3cbg1spbX2s wMmg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690193306; x=1690798106; 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=oVZBD26n61nILm1319d0FZlD/fP50Fwp7YtrZB2yUEw=; b=OSyreMzYlAMXrbsA1P+cWVFEQkzO94HjHdkwfQHyn3KVODxe/PwdOcpwkcBF9OfrEj ketNVsd7EeTGIpLXDlqRgPTnq7LK1SwlkwRu7uWEjK1TPlFrD8tHgz/uJ8m6Ad8Lyjpz wmW7Th6NjlZ/IgN5+SlksyXqr4piuCzk6VJFs21j8xpHQkim0dvLFqNu4SkmuWdDrXaF lGf8r+LijItlSIXPI/U1ADooIZmR6IDLN7UEI912C283cwwkU+foStAIkyyxUbeU1pN5 Bt3naZN3Oy8ZYBtS1ocesM7582DBKvJw8FplsLPTaRM635zgE8gzDHKjE1niQK1qHg3K pM/A== X-Gm-Message-State: ABy/qLbGJBcYmWjyz7a0vsnddEzF2BANbTX2JyusLDlDtz0ERhBOYJZ9 cdvIS0kp3QzWdYdCUeCcJJinqkNoNlvidGmGVUg= X-Google-Smtp-Source: APBJJlFQ+sAFI6LIZ7PgU9puTnlNzbjLYXvmJ0kfMmGkS9XBnuUvcLZ7El1l1GYgUvVEvdh+XgkfrQ== X-Received: by 2002:a17:902:e74d:b0:1bb:ac37:384b with SMTP id p13-20020a170902e74d00b001bbac37384bmr1242952plf.6.1690192266338; Mon, 24 Jul 2023 02:51:06 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.147]) by smtp.gmail.com with ESMTPSA id d5-20020a170902c18500b001bb20380bf2sm8467233pld.13.2023.07.24.02.50.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jul 2023 02:51:06 -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 Subject: [PATCH v2 30/47] virtio_balloon: dynamically allocate the virtio-balloon shrinker Date: Mon, 24 Jul 2023 17:43:37 +0800 Message-Id: <20230724094354.90817-31-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: kvm@vger.kernel.org In preparation for implementing lockless slab shrink, use new APIs to dynamically allocate the virtio-balloon 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 virtio_balloon. Signed-off-by: Qi Zheng Reviewed-by: Muchun Song --- drivers/virtio/virtio_balloon.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 5b15936a5214..d773860c3b18 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -111,7 +111,7 @@ struct virtio_balloon { struct virtio_balloon_stat stats[VIRTIO_BALLOON_S_NR]; /* Shrinker to return free pages - VIRTIO_BALLOON_F_FREE_PAGE_HINT */ - struct shrinker shrinker; + struct shrinker *shrinker; /* OOM notifier to deflate on OOM - VIRTIO_BALLOON_F_DEFLATE_ON_OOM */ struct notifier_block oom_nb; @@ -816,8 +816,7 @@ static unsigned long shrink_free_pages(struct virtio_balloon *vb, static unsigned long virtio_balloon_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) { - struct virtio_balloon *vb = container_of(shrinker, - struct virtio_balloon, shrinker); + struct virtio_balloon *vb = shrinker->private_data; return shrink_free_pages(vb, sc->nr_to_scan); } @@ -825,8 +824,7 @@ static unsigned long virtio_balloon_shrinker_scan(struct shrinker *shrinker, static unsigned long virtio_balloon_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) { - struct virtio_balloon *vb = container_of(shrinker, - struct virtio_balloon, shrinker); + struct virtio_balloon *vb = shrinker->private_data; return vb->num_free_page_blocks * VIRTIO_BALLOON_HINT_BLOCK_PAGES; } @@ -847,16 +845,23 @@ static int virtio_balloon_oom_notify(struct notifier_block *nb, static void virtio_balloon_unregister_shrinker(struct virtio_balloon *vb) { - unregister_shrinker(&vb->shrinker); + shrinker_unregister(vb->shrinker); } static int virtio_balloon_register_shrinker(struct virtio_balloon *vb) { - vb->shrinker.scan_objects = virtio_balloon_shrinker_scan; - vb->shrinker.count_objects = virtio_balloon_shrinker_count; - vb->shrinker.seeks = DEFAULT_SEEKS; + vb->shrinker = shrinker_alloc(0, "virtio-balloon"); + if (!vb->shrinker) + return -ENOMEM; - return register_shrinker(&vb->shrinker, "virtio-balloon"); + vb->shrinker->scan_objects = virtio_balloon_shrinker_scan; + vb->shrinker->count_objects = virtio_balloon_shrinker_count; + vb->shrinker->seeks = DEFAULT_SEEKS; + vb->shrinker->private_data = vb; + + shrinker_register(vb->shrinker); + + return 0; } static int virtballoon_probe(struct virtio_device *vdev)