From: Cyril Hrubis Date: Wed, 2 Aug 2023 15:19:06 +0000 (+0200) Subject: sched/rt: sysctl_sched_rr_timeslice show default timeslice after reset X-Git-Tag: microblaze-v6.8~664^2~11 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=c1fc6484e1fb7cc2481d169bfef129a1b0676abe;p=linux-2.6-microblaze.git 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 Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Petr Vorel Acked-by: Mel Gorman Tested-by: Petr Vorel Link: https://lore.kernel.org/r/20230802151906.25258-3-chrubis@suse.cz --- 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);