From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3444635-1521483693-2-16850870785817956721 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1521483693; b=Qx4siA17WL4NwNkXPFgUhgOws6rW1xA7pwsfhXiZTq10sGX wXx1aNr/3s3kG0gDpzr58GwDmR7WUh+QqCMgKK4AOppuYpwRTR32x8CYZnFJW7NM 5QBVtMlAheMIycVWUG8PqVNuWmyl9hFT1NzgGhW3N/44ZcJLfQtbMZ7EiLYOeWMS t2EgYru4brxqdrYqK87wGZLPvPSmixod6kuEJKrzkurhgvEfhvATdjbB8rQrBYM1 mb1wyOu90gOvXpR9gBeUaI9WOU+raHEcNoh4GdcX5OUnH93b/j6k19Kn9sL/+v/B I9nB8dfA6fHW1UgYt6Qb/2u1o3MDBDNDe1r4yeA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-type:sender :list-id; s=arctest; t=1521483693; bh=GtgNd+4slKMTPKoT9FJZWRtLno APYWFmuwBe3ouSFM0=; b=KqT9IfBdiQmUhC1zvFLcuNrlndv4v6RuMhGje7abnu iiXe6UJOUlI0ugCOUBYzw/15N2aKtXBTKornImqVK+kcP1UnX26K3ZgmY0pXhXIt 9MXGuKked4SIixydfJqUkT6l+mZbS4PfarspRrbV6qC97iJ6h+oi/RGrqhNAsj6u iCUAy/XykUQaUBtpY5rGc1Wl0pR9yhqlpRrL5GZpGF2AhC4QDLQyrWodP/ymvY5u YeXgEujM/j8ukLfuLHHAbDFYc9lq2B/MJQybCyb31BKV1/dd0RHFuANW58TsO5uK bAgTRIPpnsohVK0PZDjWYyGDUvkAG4Nf+hJSWIYS5NfQ== ARC-Authentication-Results: i=1; mx3.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0 spamcause=gggruggvucftvghtrhhoucdtuddrgedtgedrudefgdduuddvucdltddurdegtdefrddttddmucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvffufffkofgjfhgfgggtshhpjeesthdtfedtreerjeenucfhrhhomhepifhrvghgucfmrhhorghhqdfjrghrthhmrghnuceoghhrvghgkhhhsehlihhnuhigfhhouhhnuggrthhiohhnrdhorhhgqeenucfkphepvddtledrudefvddrudektddrieejpdeltddrledvrdeiuddrvddtvdenucfrrghrrghmpehinhgvthepvddtledrudefvddrudektddrieejpdhhvghlohepvhhgvghrrdhkvghrnhgvlhdrohhrghdpmhgrihhlfhhrohhmpeeoshhtrggslhgvqdhofihnvghrsehvghgvrhdrkhgvrhhnvghlrdhorhhgqecuuefqffgjpeekuefkvffokffogfcuuffkkgfgpeefheekleenucevlhhushhtvghrufhiiigvpeeiie; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Authentication-Results: mx3.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0 spamcause=gggruggvucftvghtrhhoucdtuddrgedtgedrudefgdduuddvucdltddurdegtdefrddttddmucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvffufffkofgjfhgfgggtshhpjeesthdtfedtreerjeenucfhrhhomhepifhrvghgucfmrhhorghhqdfjrghrthhmrghnuceoghhrvghgkhhhsehlihhnuhigfhhouhhnuggrthhiohhnrdhorhhgqeenucfkphepvddtledrudefvddrudektddrieejpdeltddrledvrdeiuddrvddtvdenucfrrghrrghmpehinhgvthepvddtledrudefvddrudektddrieejpdhhvghlohepvhhgvghrrdhkvghrnhgvlhdrohhrghdpmhgrihhlfhhrohhmpeeoshhtrggslhgvqdhofihnvghrsehvghgvrhdrkhgvrhhnvghlrdhorhhgqecuuefqffgjpeekuefkvffokffogfcuuffkkgfgpeefheekleenucevlhhushhtvghrufhiiigvpeeiie; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031110AbeCSSVW (ORCPT ); Mon, 19 Mar 2018 14:21:22 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:48048 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031100AbeCSSVU (ORCPT ); Mon, 19 Mar 2018 14:21:20 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Shaohua Li , Jens Axboe , Sasha Levin Subject: [PATCH 4.9 078/241] blk-throttle: make sure expire time isnt too big Date: Mon, 19 Mar 2018 19:05:43 +0100 Message-Id: <20180319180754.432758367@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180319180751.172155436@linuxfoundation.org> References: <20180319180751.172155436@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Shaohua Li [ Upstream commit 06cceedcca67a93ac7f7aa93bbd9980c7496d14e ] cgroup could be throttled to a limit but when all cgroups cross high limit, queue enters a higher state and so the group should be throttled to a higher limit. It's possible the cgroup is sleeping because of throttle and other cgroups don't dispatch IO any more. In this case, nobody can trigger current downgrade/upgrade logic. To fix this issue, we could either set up a timer to wakeup the cgroup if other cgroups are idle or make sure this cgroup doesn't sleep too long. Setting up a timer means we must change the timer very frequently. This patch chooses the latter. Making cgroup sleep time not too big wouldn't change cgroup bps/iops, but could make it wakeup more frequently, which isn't a big issue because throtl_slice * 8 is already quite big. Signed-off-by: Shaohua Li Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- block/blk-throttle.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -499,6 +499,17 @@ static void throtl_dequeue_tg(struct thr static void throtl_schedule_pending_timer(struct throtl_service_queue *sq, unsigned long expires) { + unsigned long max_expire = jiffies + 8 * throtl_slice; + + /* + * Since we are adjusting the throttle limit dynamically, the sleep + * time calculated according to previous limit might be invalid. It's + * possible the cgroup sleep time is very long and no other cgroups + * have IO running so notify the limit changes. Make sure the cgroup + * doesn't sleep too long to avoid the missed notification. + */ + if (time_after(expires, max_expire)) + expires = max_expire; mod_timer(&sq->pending_timer, expires); throtl_log(sq, "schedule timer. delay=%lu jiffies=%lu", expires - jiffies, jiffies);