iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

sched: Simplify sched_exec()

Browse Source 
Use guards to reduce gotos and simplify control flow.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lore.kernel.org/r/20230801211812.168490417@infradead.org
This commit is contained in:
Peter Zijlstra 2023-08-01 22:41:27 +02:00
parent 857d315f12
commit 4bdada79f3
1 changed files with 9 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
kernel/sched/core.c
View File

@ -5498,23 +5498,20 @@ unsigned int nr_iowait(void)
void sched_exec(void)
{
struct task_struct *p = current;
unsigned long flags;
struct migration_arg arg;
int dest_cpu;
raw_spin_lock_irqsave(&p->pi_lock, flags);
dest_cpu = p->sched_class->select_task_rq(p, task_cpu(p), WF_EXEC);
if (dest_cpu == smp_processor_id())
goto unlock;
scoped_guard (raw_spinlock_irqsave, &p->pi_lock) {
dest_cpu = p->sched_class->select_task_rq(p, task_cpu(p), WF_EXEC);
if (dest_cpu == smp_processor_id())
return;
if (likely(cpu_active(dest_cpu))) {
struct migration_arg arg = { p, dest_cpu };
if (unlikely(!cpu_active(dest_cpu)))
return;
raw_spin_unlock_irqrestore(&p->pi_lock, flags);
stop_one_cpu(task_cpu(p), migration_cpu_stop, &arg);
return;
arg = (struct migration_arg){ p, dest_cpu };
}
unlock:
raw_spin_unlock_irqrestore(&p->pi_lock, flags);
stop_one_cpu(task_cpu(p), migration_cpu_stop, &arg);
}
#endif