[tip: sched/core] sched/deadline: Convert schedtool example to chrt

[tip-bot2 for Christian Loehle]

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     e031b586326f7d3d6be70dd1d69ed3045d9506ca
Gitweb:        https://git.kernel.org/tip/e031b586326f7d3d6be70dd1d69ed3045d9506ca
Author:        Christian Loehle <christian.loehle@xxxxxxx>
AuthorDate:    Tue, 13 Aug 2024 15:43:45 +01:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Tue, 10 Sep 2024 09:51:16 +02:00

sched/deadline: Convert schedtool example to chrt

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@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Juri Lelli <juri.lelli@xxxxxxxxxx>
Acked-by: Rafael J. Wysocki <rafael@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240813144348.1180344-2-christian.loehle@xxxxxxx
---
 Documentation/scheduler/sched-deadline.rst | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/Documentation/scheduler/sched-deadline.rst b/Documentation/scheduler/sched-deadline.rst
index 9fe4846..22838ed 100644
--- a/Documentation/scheduler/sched-deadline.rst
+++ b/Documentation/scheduler/sched-deadline.rst
@@ -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()
 ==========================