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sched/deadline: Show leftover runtime and abs deadline in /proc/*/sched

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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 <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Juri Lelli <[email protected]>
Reviewed-by: Luca Abeni <[email protected]>
Acked-by: Daniel Bistrot de Oliveira <[email protected]>
Cc: Juri Lelli <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Tommaso Cucinotta 2016-10-26 11:17:17 +02:00 • committed by Ingo Molnar
commit 59f8c29892
2 changed files with 10 additions and 0 deletions
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6
Documentation/scheduler/sched-deadline.txt
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@ -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