diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2026-01-21 15:10:29 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-01-22 11:11:20 +0100 |
| commit | bb332a9e5a057d2cb9b90e307b26cce9b1f6f660 (patch) | |
| tree | 1e547de324ed3ed7837f60b559fdf17ff452a979 /Documentation/userspace-api | |
| parent | 5d6446f409da00e5a389125ddb5ce09f5bc404c9 (diff) | |
selftests/rseq: Add rseq slice histogram script
A script that processes trace-cmd data and generates a histogram of
rseq slice_ext durations for the recorded workload.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260121143208.340549136@infradead.org
Diffstat (limited to 'Documentation/userspace-api')
| -rw-r--r-- | Documentation/userspace-api/rseq.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/userspace-api/rseq.rst b/Documentation/userspace-api/rseq.rst index 468f6bbe0e25..3cd27a3c7c7e 100644 --- a/Documentation/userspace-api/rseq.rst +++ b/Documentation/userspace-api/rseq.rst @@ -83,6 +83,9 @@ determined by debugfs:rseq/slice_ext_nsec. The default value is 5 usec; which is the minimum value. It can be incremented to 50 usecs, however doing so can/will affect the minimum scheduling latency. +Any proposed changes to this default will have to come with a selftest and +rseq-slice-hist.py output that shows the new value has merrit. + The kernel indicates the grant by clearing rseq::slice_ctrl::request and setting rseq::slice_ctrl::granted to 1. If there is a reschedule of the thread after granting the extension, the kernel clears the granted bit to |