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torture: Add torture_sched_set_normal() for user-specified nice values

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This new torture_sched_set_normal() function clamps the nice value at
the MIN_NICE..MAX_NICE limits, splatting it these limits are exceeded.
It then invokes sched_set_normal() to set the new value.  This prevents
more difficult-to-debug failures within the scheduler.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit is contained in:
Paul E. McKenney
2026-05-07 09:57:16 -07:00
committed by Uladzislau Rezki (Sony)
parent aa61e8b4fb
commit 59cf5dbcc9
2 changed files with 17 additions and 0 deletions
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1
include/linux/torture.h
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@@ -129,6 +129,7 @@ void _torture_stop_kthread(char *m, struct task_struct **tp);
#else
#define torture_preempt_schedule() do { } while (0)
#endif
void torture_sched_set_normal(struct task_struct *t, int nice);
#if IS_ENABLED(CONFIG_RCU_TORTURE_TEST) || IS_MODULE(CONFIG_RCU_TORTURE_TEST) || IS_ENABLED(CONFIG_LOCK_TORTURE_TEST) || IS_MODULE(CONFIG_LOCK_TORTURE_TEST)
long torture_sched_setaffinity(pid_t pid, const struct cpumask *in_mask, bool dowarn);

16
kernel/torture.c
View File

@@ -972,3 +972,19 @@ void _torture_stop_kthread(char *m, struct task_struct **tp)
*tp = NULL;
}
EXPORT_SYMBOL_GPL(_torture_stop_kthread);
/*
* Set the specified task's niceness value, saturating at limits.
* Saturating noisily, but saturating.
*/
void torture_sched_set_normal(struct task_struct *t, int nice)
{
int realnice = nice;
if (WARN_ON_ONCE(realnice > MAX_NICE))
realnice = MAX_NICE;
if (WARN_ON_ONCE(realnice < MIN_NICE))
realnice = MIN_NICE;
sched_set_normal(t, realnice);
}
EXPORT_SYMBOL_GPL(torture_sched_set_normal);