diff options
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/hwlat_detector.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/trace/hwlat_detector.txt b/Documentation/trace/hwlat_detector.txt index c02e8ef800cf..3207717a0d1a 100644 --- a/Documentation/trace/hwlat_detector.txt +++ b/Documentation/trace/hwlat_detector.txt @@ -69,5 +69,11 @@ in /sys/kernel/tracing: tracing_threshold - minimum latency value to be considered (usecs) tracing_max_latency - maximum hardware latency actually observed (usecs) + tracing_cpumask - the CPUs to move the hwlat thread across hwlat_detector/width - specified amount of time to spin within window (usecs) hwlat_detector/window - amount of time between (width) runs (usecs) + +The hwlat detector's kernel thread will migrate across each CPU specified in +tracing_cpumask between each window. To limit the migration, either modify +tracing_cpumask, or modify the hwlat kernel thread (named [hwlatd]) CPU +affinity directly, and the migration will stop. |