diff options
| author | Cyril Hrubis <chrubis@suse.cz> | 2023-08-02 17:19:06 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-08-14 17:01:23 +0200 |
| commit | c1fc6484e1fb7cc2481d169bfef129a1b0676abe (patch) | |
| tree | ad882f520d5693828da11accf488e88eddc44517 | |
| parent | c7fcb99877f9f542c918509b2801065adcaf46fa (diff) | |
sched/rt: sysctl_sched_rr_timeslice show default timeslice after reset
The sched_rr_timeslice can be reset to default by writing value that is
<= 0. However after reading from this file we always got the last value
written, which is not useful at all.
$ echo -1 > /proc/sys/kernel/sched_rr_timeslice_ms
$ cat /proc/sys/kernel/sched_rr_timeslice_ms
-1
Fix this by setting the variable that holds the sysctl file value to the
jiffies_to_msecs(RR_TIMESLICE) in case that <= 0 value was written.
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Acked-by: Mel Gorman <mgorman@suse.de>
Tested-by: Petr Vorel <pvorel@suse.cz>
Link: https://lore.kernel.org/r/20230802151906.25258-3-chrubis@suse.cz
| -rw-r--r-- | kernel/sched/rt.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 185d3d749f6b..0597ba0f85ff 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -3062,6 +3062,9 @@ static int sched_rr_handler(struct ctl_table *table, int write, void *buffer, sched_rr_timeslice = sysctl_sched_rr_timeslice <= 0 ? RR_TIMESLICE : msecs_to_jiffies(sysctl_sched_rr_timeslice); + + if (sysctl_sched_rr_timeslice <= 0) + sysctl_sched_rr_timeslice = jiffies_to_msecs(RR_TIMESLICE); } mutex_unlock(&mutex); |