From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8BC8C76186 for ; Wed, 24 Jul 2019 20:00:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 917F9206BA for ; Wed, 24 Jul 2019 20:00:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563998443; bh=Imh51isZT2drzGlUwJKWk7XtSEG4yh7bkKWU/He7j2U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=VhTsi2tqXoncnu2K2IB9LrWaHRGlIGhFWu+kyojAS2eo18L9r+g8dnWVHT3wz54zR r2WrG3qF0LOSe1e0tF3G2tge6uDWn6TAD6WPnzqYRtTzxbPX6ezD0HAWYyp3UYtvu9 ucToZVhCi/cjxUrXlNAFTKTl5ssRZdv1136PW/UQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405266AbfGXUAl (ORCPT ); Wed, 24 Jul 2019 16:00:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:48892 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404950AbfGXUAk (ORCPT ); Wed, 24 Jul 2019 16:00:40 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 15FCA205C9; Wed, 24 Jul 2019 20:00:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563998440; bh=Imh51isZT2drzGlUwJKWk7XtSEG4yh7bkKWU/He7j2U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L96R8ybIVsIcNIkO9Gi7iC4SfP3aSRs5jV/SMF39ypaPRUxRCyiqTQBksnCF7brMu Tkbyr20x7dg2u6UBc81h94D++4rFyUyiGwqFqKh0xUrVygpVuSPJ8E47zsL0aRY27I hONsN/ngv4NbcDZv+t0vfN+Y/syF/4wWUGHPzZJY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tejun Heo , Josef Bacik , Jens Axboe Subject: [PATCH 5.1 366/371] blk-iolatency: clear use_delay when io.latency is set to zero Date: Wed, 24 Jul 2019 21:21:58 +0200 Message-Id: <20190724191751.788091643@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190724191724.382593077@linuxfoundation.org> References: <20190724191724.382593077@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Tejun Heo commit 5de0073fcd50cc1f150895a7bb04d3cf8067b1d7 upstream. If use_delay was non-zero when the latency target of a cgroup was set to zero, it will stay stuck until io.latency is enabled on the cgroup again. This keeps readahead disabled for the cgroup impacting performance negatively. Signed-off-by: Tejun Heo Cc: Josef Bacik Fixes: d70675121546 ("block: introduce blk-iolatency io controller") Cc: stable@vger.kernel.org # v4.19+ Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/blk-iolatency.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/block/blk-iolatency.c +++ b/block/blk-iolatency.c @@ -758,8 +758,10 @@ static int iolatency_set_min_lat_nsec(st if (!oldval && val) return 1; - if (oldval && !val) + if (oldval && !val) { + blkcg_clear_delay(blkg); return -1; + } return 0; }