From patchwork Wed Jan 18 12:31:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 13106322 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 66BDEC32793 for ; Wed, 18 Jan 2023 12:45:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230327AbjARMp2 (ORCPT ); Wed, 18 Jan 2023 07:45:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44714 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230432AbjARMnX (ORCPT ); Wed, 18 Jan 2023 07:43:23 -0500 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF55210A83; Wed, 18 Jan 2023 04:07:40 -0800 (PST) Received: from mail02.huawei.com (unknown [172.30.67.143]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4NxkzB6RLTz4f3m7B; Wed, 18 Jan 2023 20:07:34 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.127.227]) by APP3 (Coremail) with SMTP id _Ch0CgCHgR8G4cdjY2MdBw--.48220S4; Wed, 18 Jan 2023 20:07:36 +0800 (CST) From: Yu Kuai To: tj@kernel.org, hch@lst.de, josef@toxicpanda.com, axboe@kernel.dk Cc: cgroups@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com, yangerkun@huawei.com Subject: [PATCH -next v2 0/3] blk-cgroup: make sure pd_free_fn() is called in order Date: Wed, 18 Jan 2023 20:31:49 +0800 Message-Id: <20230118123152.1926314-1-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 X-CM-TRANSID: _Ch0CgCHgR8G4cdjY2MdBw--.48220S4 X-Coremail-Antispam: 1UD129KBjvdXoWrKFyfKF4DGryfAr1xuw1DGFg_yoWkXFgEka 4vgryrC34UA3W2kF92krn0vFZ8KrWjqr18XayqqrWxWF17Xw4xtan3K34ruF47ua109r15 Jasavrs2qrnFqjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbxxFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Cr0_ Gr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s 0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xII jxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr 1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E8cxa n2IY04v7MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrV AFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCI c40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267 AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_WFyUJVCq3wCI42IY6I8E87Iv67AKxVWU JVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjfUoO J5UUUUU X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Yu Kuai The problem was found in iocost orignally([1]) that ioc can be freed in ioc_pd_free(). And later we found that there are more problem in iocost([2]). After some discussion, as suggested by Tejun([3]), we decide to fix the problem that parent pd can be freed before child pd in cgroup layer first. And the problem in [1] will be fixed later if this patchset is applied. [1] https://lore.kernel.org/all/20221130132156.2836184-8-linan122@huawei.com/ [2] https://lore.kernel.org/all/aa924294-2f54-1b53-fc6e-e4f8fa019b14@huaweicloud.com/ [3] https://lore.kernel.org/all/20221227125502.541931-1-yukuai1@huaweicloud.com/ Yu Kuai (3): blk-cgroup: dropping parent refcount after pd_free_fn() is done blk-cgroup: support to track if policy is online blk-cgroup: synchronize pd_free_fn() from blkg_free_workfn() and blkcg_deactivate_policy() block/blk-cgroup.c | 61 +++++++++++++++++++++++++++++++----------- block/blk-cgroup.h | 1 + include/linux/blkdev.h | 1 + 3 files changed, 48 insertions(+), 15 deletions(-)