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sched/deadline: Convert schedtool example to chrt

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chrt has SCHED_DEADLINE support so convert the example instead of
relying on a schedtool fork. While at it fix the wrong mentioning
of microseconds, it was nanoseconds for both schedtool and chrt.

Signed-off-by: Christian Loehle <christian.loehle@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Juri Lelli <juri.lelli@redhat.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20240813144348.1180344-2-christian.loehle@arm.com
This commit is contained in:
Christian Loehle 2024-08-13 15:43:45 +01:00 committed by Peter Zijlstra
parent 2cab4bd024
commit 8bee4ca5bd
1 changed files with 6 additions and 8 deletions
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14
Documentation/scheduler/sched-deadline.rst
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@ -749,21 +749,19 @@ Appendix A. Test suite
of the command line options. Please refer to rt-app documentation for more
details (`<rt-app-sources>/doc/*.json`).
The second testing application is a modification of schedtool, called
schedtool-dl, which can be used to setup SCHED_DEADLINE parameters for a
certain pid/application. schedtool-dl is available at:
https://github.com/scheduler-tools/schedtool-dl.git.
The second testing application is done using chrt which has support
for SCHED_DEADLINE.
The usage is straightforward::
# schedtool -E -t 10000000:100000000 -e ./my_cpuhog_app
# chrt -d -T 10000000 -D 100000000 0 ./my_cpuhog_app
With this, my_cpuhog_app is put to run inside a SCHED_DEADLINE reservation
of 10ms every 100ms (note that parameters are expressed in microseconds).
You can also use schedtool to create a reservation for an already running
of 10ms every 100ms (note that parameters are expressed in nanoseconds).
You can also use chrt to create a reservation for an already running
application, given that you know its pid::
# schedtool -E -t 10000000:100000000 my_app_pid
# chrt -d -T 10000000 -D 100000000 -p 0 my_app_pid
Appendix B. Minimal main()
==========================