From: Tommaso Cucinotta <tommaso.cucinotta@sssup.it>
To: Luca Abeni <luca.abeni@unitn.it>,
Juri Lelli <juri.lelli@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Tommaso Cucinotta <tommaso.cucinotta@sssup.it>,
Daniel Bistrot de Oliveira <danielbristot@gmail.com>,
Ingo Molnar <mingo@kernel.org>
Subject: [PATCH] sched/deadline: show leftover runtime and abs deadline in /proc/*/sched
Date: Wed, 26 Oct 2016 11:17:17 +0200 [thread overview]
Message-ID: <1477473437-10346-2-git-send-email-tommaso.cucinotta@sssup.it> (raw)
In-Reply-To: <1477473437-10346-1-git-send-email-tommaso.cucinotta@sssup.it>
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 <tommaso.cucinotta@sssup.it>
Reviewed-by: Juri Lelli <juri.lelli@arm.com>
Reviewed-by: Luca Abeni <luca.abeni@unitn.it>
Acked-by: Daniel Bistrot de Oliveira <danielbristot@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
---
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/<pid>/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
next prev parent reply other threads:[~2016-10-26 9:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-24 22:32 [RFC PATCH] sched/deadline: show leftover runtime and abs deadline in /proc/-/sched Tommaso Cucinotta
2016-10-24 22:32 ` [RFC PATCH] sched/deadline: show leftover runtime and abs deadline in /proc/*/sched Tommaso Cucinotta
2016-10-25 9:39 ` Juri Lelli
2016-10-25 9:25 ` [RFC PATCH] sched/deadline: show leftover runtime and abs deadline in /proc/-/sched Peter Zijlstra
2016-10-25 9:33 ` Juri Lelli
2016-10-25 10:10 ` luca abeni
2016-10-25 11:31 ` Daniel Bristot de Oliveira
2016-10-26 9:17 ` [PATCH] " Tommaso Cucinotta
2016-10-26 9:17 ` Tommaso Cucinotta [this message]
2017-01-14 12:47 ` [tip:sched/core] sched/deadline: Show leftover runtime and abs deadline in /proc/*/sched tip-bot for Tommaso Cucinotta
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