From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:58444 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750948AbeASHyC (ORCPT ); Fri, 19 Jan 2018 02:54:02 -0500 Subject: Patch "sched/deadline: Zero out positive runtime after throttling constrained tasks" has been added to the 4.4-stable tree To: xlpang@redhat.com, ben.hutchings@codethink.co.uk, bristot@redhat.com, efault@gmx.de, gregkh@linuxfoundation.org, juri.lelli@arm.com, luca.abeni@santannapisa.it, mingo@kernel.org, peterz@infradead.org, rostedt@goodmis.org, tglx@linutronix.de, torvalds@linux-foundation.org Cc: , From: Date: Fri, 19 Jan 2018 08:53:59 +0100 Message-ID: <151634843913390@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled sched/deadline: Zero out positive runtime after throttling constrained tasks to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: sched-deadline-zero-out-positive-runtime-after-throttling-constrained-tasks.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From ae83b56a56f8d9643dedbee86b457fa1c5d42f59 Mon Sep 17 00:00:00 2001 From: Xunlei Pang Date: Wed, 10 May 2017 21:03:37 +0800 Subject: sched/deadline: Zero out positive runtime after throttling constrained tasks From: Xunlei Pang commit ae83b56a56f8d9643dedbee86b457fa1c5d42f59 upstream. When a contrained task is throttled by dl_check_constrained_dl(), it may carry the remaining positive runtime, as a result when dl_task_timer() fires and calls replenish_dl_entity(), it will not be replenished correctly due to the positive dl_se->runtime. This patch assigns its runtime to 0 if positive after throttling. Signed-off-by: Xunlei Pang Signed-off-by: Peter Zijlstra (Intel) Acked-by: Daniel Bristot de Oliveira Cc: Juri Lelli Cc: Linus Torvalds Cc: Luca Abeni Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Thomas Gleixner Fixes: df8eac8cafce ("sched/deadline: Throttle a constrained deadline task activated after the deadline) Link: http://lkml.kernel.org/r/1494421417-27550-1-git-send-email-xlpang@redhat.com Signed-off-by: Ingo Molnar Cc: Ben Hutchings Signed-off-by: Greg Kroah-Hartman --- kernel/sched/deadline.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -732,6 +732,8 @@ static inline void dl_check_constrained_ if (unlikely(dl_se->dl_boosted || !start_dl_timer(p))) return; dl_se->dl_throttled = 1; + if (dl_se->runtime > 0) + dl_se->runtime = 0; } } Patches currently in stable-queue which might be from xlpang@redhat.com are queue-4.4/sched-deadline-zero-out-positive-runtime-after-throttling-constrained-tasks.patch