aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorClaudio Scordino <[email protected]>2017-11-14 12:19:26 +0100
committerIngo Molnar <[email protected]>2017-11-16 09:00:35 +0100
commit5c0342ca7ef17220d8dd2da68d0d349c26ab19df (patch)
tree9de70d4c16ebd6c21ebc98774ff38cd3a99d3003
parentb29c6ef7bb1257853c1e31616d84f55e561cf631 (diff)
sched/deadline: Fix the description of runtime accounting in the documentation
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]>
-rw-r--r--Documentation/scheduler/sched-deadline.txt13
1 files changed, 10 insertions, 3 deletions
diff --git a/Documentation/scheduler/sched-deadline.txt b/Documentation/scheduler/sched-deadline.txt
index e89e36ec15a5..8ce78f82ae23 100644
--- a/Documentation/scheduler/sched-deadline.txt
+++ b/Documentation/scheduler/sched-deadline.txt
@@ -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