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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 of the command line options. Please refer to rt-app documentation for more
details (`<rt-app-sources>/doc/*.json`). details (`<rt-app-sources>/doc/*.json`).
The second testing application is a modification of schedtool, called The second testing application is done using chrt which has support
schedtool-dl, which can be used to setup SCHED_DEADLINE parameters for a for SCHED_DEADLINE.
certain pid/application. schedtool-dl is available at:
https://github.com/scheduler-tools/schedtool-dl.git.
The usage is straightforward:: 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 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). of 10ms every 100ms (note that parameters are expressed in nanoseconds).
You can also use schedtool to create a reservation for an already running You can also use chrt to create a reservation for an already running
application, given that you know its pid:: 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() Appendix B. Minimal main()
========================== ==========================