Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757864AbcJZJRl (ORCPT ); Wed, 26 Oct 2016 05:17:41 -0400 Received: from ms01.sssup.it ([193.205.80.99]:35921 "EHLO sssup.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757784AbcJZJRh (ORCPT ); Wed, 26 Oct 2016 05:17:37 -0400 From: Tommaso Cucinotta To: Luca Abeni , Juri Lelli , Peter Zijlstra , Ingo Molnar Cc: linux-kernel@vger.kernel.org, Tommaso Cucinotta , Daniel Bistrot de Oliveira , Ingo Molnar Subject: [PATCH] sched/deadline: show leftover runtime and abs deadline in /proc/*/sched Date: Wed, 26 Oct 2016 11:17:17 +0200 Message-Id: <1477473437-10346-2-git-send-email-tommaso.cucinotta@sssup.it> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1477473437-10346-1-git-send-email-tommaso.cucinotta@sssup.it> References: <1477348374-8248-1-git-send-email-tommaso.cucinotta@sssup.it> <1477473437-10346-1-git-send-email-tommaso.cucinotta@sssup.it> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2103 Lines: 56 This patch allows for reading the current (leftover) runtime and absolute deadline of a SCHED_DEADLINE task through /proc/*/sched (entries dl.runtime and dl.deadline), while debugging/testing. Signed-off-by: Tommaso Cucinotta Reviewed-by: Juri Lelli Reviewed-by: Luca Abeni Acked-by: Daniel Bistrot de Oliveira Cc: Peter Zijlstra Cc: Ingo Molnar --- Documentation/scheduler/sched-deadline.txt | 6 ++++++ kernel/sched/debug.c | 4 ++++ 2 files changed, 10 insertions(+) diff --git a/Documentation/scheduler/sched-deadline.txt b/Documentation/scheduler/sched-deadline.txt index 8e37b0b..cbc1b46 100644 --- a/Documentation/scheduler/sched-deadline.txt +++ b/Documentation/scheduler/sched-deadline.txt @@ -408,6 +408,11 @@ CONTENTS * the new scheduling related syscalls that manipulate it, i.e., sched_setattr() and sched_getattr() are implemented. + For debugging purposes, the leftover runtime and absolute deadline of a + SCHED_DEADLINE task can be retrieved through /proc//sched (entries + dl.runtime and dl.deadline, both values in ns). A programmatic way to + retrieve these values from production code is under discussion. + 4.3 Default behavior --------------------- @@ -476,6 +481,7 @@ CONTENTS Still missing: + - programmatic way to retrieve current runtime and absolute deadline - refinements to deadline inheritance, especially regarding the possibility of retaining bandwidth isolation among non-interacting tasks. This is being studied from both theoretical and practical points of view, and diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index fa178b6..109adc0 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -953,6 +953,10 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m) #endif P(policy); P(prio); + if (p->policy == SCHED_DEADLINE) { + P(dl.runtime); + P(dl.deadline); + } #undef PN_SCHEDSTAT #undef PN #undef __PN -- 2.7.4