Commit-ID: 59f8c2989283bbd3df9fcfb22494d84f4852e536 Gitweb: http://git.kernel.org/tip/59f8c2989283bbd3df9fcfb22494d84f4852e536 Author: Tommaso Cucinotta <tommaso.cucino...@sssup.it> AuthorDate: Wed, 26 Oct 2016 11:17:17 +0200 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Sat, 14 Jan 2017 11:30:00 +0100
sched/deadline: Show leftover runtime and abs deadline in /proc/*/sched 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.cucino...@sssup.it> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Reviewed-by: Juri Lelli <juri.le...@arm.com> Reviewed-by: Luca Abeni <luca.ab...@unitn.it> Acked-by: Daniel Bistrot de Oliveira <danielbris...@gmail.com> Cc: Juri Lelli <juri.le...@gmail.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Mike Galbraith <efa...@gmx.de> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Link: http://lkml.kernel.org/r/1477473437-10346-2-git-send-email-tommaso.cucino...@sssup.it Signed-off-by: Ingo Molnar <mi...@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
