diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2026-01-21 14:25:04 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-01-22 11:11:20 +0100 |
| commit | 21c0e92d0681fbd10ac024311bd09bca439e0bb1 (patch) | |
| tree | 19511dbe24cc034bf6563871dd054b906a264f44 /kernel | |
| parent | e1d7f54900f1e1d3003a85b78cd7105a64203ff7 (diff) | |
rseq: Lower default slice extension
Change the minimum slice extension to 5 usec.
Since slice_test selftest reaches a staggering ~350 nsec extension:
Task: slice_test Mean: 350.266 ns
Latency (us) | Count
------------------------------
EXPIRED | 238
0 us | 143189
1 us | 167
2 us | 26
3 us | 11
4 us | 28
5 us | 31
6 us | 22
7 us | 23
8 us | 32
9 us | 16
10 us | 35
Lower the minimal (and default) value to 5 usecs -- which is still massive.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260121143208.073200729@infradead.org
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/rseq.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rseq.c b/kernel/rseq.c index e423a9bc0a2c..b0973d19f366 100644 --- a/kernel/rseq.c +++ b/kernel/rseq.c @@ -517,7 +517,7 @@ struct slice_timer { void *cookie; }; -static const unsigned int rseq_slice_ext_nsecs_min = 10 * NSEC_PER_USEC; +static const unsigned int rseq_slice_ext_nsecs_min = 5 * NSEC_PER_USEC; static const unsigned int rseq_slice_ext_nsecs_max = 50 * NSEC_PER_USEC; unsigned int rseq_slice_ext_nsecs __read_mostly = rseq_slice_ext_nsecs_min; static DEFINE_PER_CPU(struct slice_timer, slice_timer); |