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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1681315717; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3bKPEl8cLlrZ/2VwDkHe7tcZKUdIgYwqtpZzpBiFHDM=; b=cnCBC4FwQKZKslE1NCHQUuxO6RB9n5wldYgPudjea9JE6Vc63s5tmmAc54YAodnGf2xIif JXRFme7vMTMpK53ZoJ/9FULSDVDyiQaQ1s5jHSz54tRERNJ7pnZ8JQnprkAtNqnicgFZyi ijnKHZEWNJ3pDH0outC5ygYPvdwfRWA= From: chengming.zhou@linux.dev To: axboe@kernel.dk, tj@kernel.org Cc: josef@toxicpanda.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Chengming Zhou Subject: [PATCH 2/2] blk-throttle: only enable blk-stat when BLK_DEV_THROTTLING_LOW Date: Thu, 13 Apr 2023 00:07:54 +0800 Message-Id: <20230412160754.1981705-2-chengming.zhou@linux.dev> In-Reply-To: <20230412160754.1981705-1-chengming.zhou@linux.dev> References: <20230412160754.1981705-1-chengming.zhou@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1762988245779817856?= X-GMAIL-MSGID: =?utf-8?q?1762988245779817856?= From: Chengming Zhou blk_throtl_register() will unconditionally enable blk-stat for gendisk when register, even when we have no BLK_DEV_THROTTLING_LOW config. Since the kernel always has only BLK_DEV_THROTTLING config and the BLK_DEV_THROTTLING_LOW config is still in EXPERIMENTAL state, we can just skip blk-stat when !BLK_DEV_THROTTLING_LOW. Signed-off-by: Chengming Zhou Acked-by: Tejun Heo --- block/blk-throttle.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 47e9d8be68f3..3c07c9cfa70a 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -2439,11 +2439,12 @@ void blk_throtl_register(struct gendisk *disk) #ifndef CONFIG_BLK_DEV_THROTTLING_LOW /* if no low limit, use previous default */ td->throtl_slice = DFL_THROTL_SLICE_HD; -#endif +#else td->track_bio_latency = !queue_is_mq(q); if (!td->track_bio_latency) blk_stat_enable_accounting(q); +#endif } #ifdef CONFIG_BLK_DEV_THROTTLING_LOW