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sched/deadline: Fix the description of runtime accounting in the documentation

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Signed-off-by: Claudio Scordino <[email protected]>
Signed-off-by: Luca Abeni <[email protected]>
Acked-by: Daniel Bristot de Oliveira <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tommaso Cucinotta <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Claudio Scordino 2017-11-14 12:19:26 +01:00 • committed by Ingo Molnar
commit 5c0342ca7e
1 changed files with 10 additions and 3 deletions
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13
Documentation/scheduler/sched-deadline.txt
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@ -204,10 +204,17 @@ CONTENTS
It does so by decrementing the runtime of the executing task Ti at a pace equal
to
dq = -max{ Ui, (1 - Uinact) } dt
dq = -max{ Ui / Umax, (1 - Uinact - Uextra) } dt
where Uinact is the inactive utilization, computed as (this_bq - running_bw),
and Ui is the bandwidth of task Ti.
where:
- Ui is the bandwidth of task Ti;
- Umax is the maximum reclaimable utilization (subjected to RT throttling
limits);
- Uinact is the (per runqueue) inactive utilization, computed as
(this_bq - running_bw);
- Uextra is the (per runqueue) extra reclaimable utilization
(subjected to RT throttling limits).
Let's now see a trivial example of two deadline tasks with runtime equal