sched/deadline: Show leftover runtime and abs deadline in /proc/*/sched (59f8c298) · Commits · 戴 / test

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> Signed-off-by:

Peter Zijlstra (Intel) <peterz@infradead.org> 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: Juri Lelli <juri.lelli@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1477473437-10346-2-git-send-email-tommaso.cucinotta@sssup.it Signed-off-by:

Ingo Molnar <mingo@kernel.org>

Documentation/scheduler/sched-deadline.txt

+6 −0

Original line number	Diff line number	Diff line
		@@ -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

kernel/sched/debug.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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

Admin message