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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 E88ADC31E45 for ; Thu, 13 Jun 2019 22:31:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BC3D121721 for ; Thu, 13 Jun 2019 22:31:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560465073; bh=Vn7R66l4H/9d5vW6KQ8RGrDYdTreBUd+4EAyjbPkEuc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DbV/ftQE835AlcuMcTeG8R+AWYtRM04Mt2J6i0YIy+o15lYil+Hz7yrE2A4mmn9E1 evLroAEYmwzhOechU9loDkTTvTcAbm+X9xUzd1s5IKcKXUsVkkz5NFZVKAfG3URkQq V1C0ZBBv/hpdRZgDEujQKgyxWwAs4qFn5paTvjKo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726447AbfFMWau (ORCPT ); Thu, 13 Jun 2019 18:30:50 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:40756 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725616AbfFMWat (ORCPT ); Thu, 13 Jun 2019 18:30:49 -0400 Received: by mail-pf1-f196.google.com with SMTP id p184so126533pfp.7; Thu, 13 Jun 2019 15:30:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=U7FQmFFF1Z7fbd/otHz8+BUYJEJIQONwHFEy1+lWias=; b=ou8LjWlocAo0l+AbBD2K8zqOXdHKtUJiuOKET9r4w2rYN8FTmJm9/rkEcRYxxwarXU SEhyPscTnAzXgCFIJWK5iLd9z+cvsmGhefs5JnhaUZGL9BA8PHvNxLll/3vFK914D+aW YGV19T8nfi1N1oex58KP07rbT7j9pfn6UcpSyu47NmD8gMfAXs/OLD0dEbr+6KXZApfn 9xJjEGAZFGRBbJsJHRclDWUgaQ8d47vAEY+fTE39qpMdFepfOyy/IMgrMnJnhI7qaIFX xazIFmZect8aSvQjduAHe4T3bW2Cigb1rVqdbJXzALIsWIPv5JtGZVMBqhXqNL8WfmBs zMAQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references; bh=U7FQmFFF1Z7fbd/otHz8+BUYJEJIQONwHFEy1+lWias=; b=HlZiktsagTB1eqWmovDjAJoxYYvEzXWFwRbBzPA7txh9LohiA+BmWU6BYcfaLSOxDp 1IZmCGB/9ytBQZaiIM7kPIYfHKOKfTtbFwevvcacEdShzphUMSXGXrM4/M0oH1xHF0Mx j562ZFTO0TpF+q4cVP1bzkpEqV1gMEZjjuoykJQ64VsFc2D88fa6Xz+B2eL2d8/P1HYs 1UbjI983WY9/tvlmhav0t8jXNE3o4HNd1t5Hf2EnG75nZ73PcV7ZR/PH56fl4eMJsyJk n3XQz+HPz9fsSB/A4jWS0mWvC+FDv2vHBpOcQMmbviG+MY0L8vT8OCbYxXCYOqu4ch98 kLJA== X-Gm-Message-State: APjAAAXPRWg3z2hmT0c6FbucaIuivI0DIst+2l2DocwzjhEJLXvTDW3l LYrio054McDnamMFTnzh1wi+aCYK X-Google-Smtp-Source: APXvYqzcZ+KeeCn26qjrgyY2X4mTd17aLheAHsEdaxp8KdwvnigyJg/XaRKDKq9XFJgvCS02qH5ksg== X-Received: by 2002:a17:90a:d681:: with SMTP id x1mr7614682pju.13.1560465048467; Thu, 13 Jun 2019 15:30:48 -0700 (PDT) Received: from localhost ([2620:10d:c091:500::2:9d14]) by smtp.gmail.com with ESMTPSA id 5sm610910pfh.109.2019.06.13.15.30.47 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 13 Jun 2019 15:30:47 -0700 (PDT) From: Tejun Heo To: axboe@kernel.dk, jbacik@fb.com Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, kernel-team@fb.com, dennis@kernel.org, jack@suse.cz, Tejun Heo , stable@vger.kernel.org Subject: [PATCH 1/5] blk-iolatency: clear use_delay when io.latency is set to zero Date: Thu, 13 Jun 2019 15:30:37 -0700 Message-Id: <20190613223041.606735-2-tj@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190613223041.606735-1-tj@kernel.org> References: <20190613223041.606735-1-tj@kernel.org> Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 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+ --- block/blk-iolatency.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c index d22e61bced86..17896bb3aaf2 100644 --- a/block/blk-iolatency.c +++ b/block/blk-iolatency.c @@ -778,8 +778,10 @@ static int iolatency_set_min_lat_nsec(struct blkcg_gq *blkg, u64 val) if (!oldval && val) return 1; - if (oldval && !val) + if (oldval && !val) { + blkcg_clear_delay(blkg); return -1; + } return 0; } -- 2.17.1