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rtla/hwnoise: Reduce runtime to 75% 

[ Upstream commit 7bc4d3089a ]

osnoise runs 100% of time by default. It makes sense because osnoise
is preemptive. hwnoise checks preemption once a second, so it
reduces system progress.

Reduce runtime to 75% to avoid problems by default. I added a Fixes
as it might avoid problems for first time users as it lands on distros.

Link: https://lkml.kernel.org/r/af0b7113ffc00031b9af4bb40ef5889a27dadf8c.1686066600.git.bristot@kernel.org

Cc: William White <chwhite@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Tested-by: Juri Lelli <juri.lelli@redhat.com>
Fixes: 1f428356c3 ("rtla: Add hwnoise tool")
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Daniel Bristot de Oliveira 2023-06-06 18:12:22 +02:00 committed by Greg Kroah-Hartman
parent 1eecbbf3d2
commit df2d221e93
1 changed files with 7 additions and 1 deletions
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8
tools/tracing/rtla/src/osnoise_top.c
View File

@ -340,8 +340,14 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
if (!params)
exit(1);
if (strcmp(argv[0], "hwnoise") == 0)
if (strcmp(argv[0], "hwnoise") == 0) {
params->mode = MODE_HWNOISE;
/*
* Reduce CPU usage for 75% to avoid killing the system.
*/
params->runtime = 750000;
params->period = 1000000;
}
while (1) {
static struct option long_options[] = {