github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-10-23 15:32:04 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

sched/debug: Add migration stats due to non preferred CPUs

Browse Source 
Add a new per-task stat,
- nr_migrations_cpu_non_preferred: number of push migrations while the
  CPU is non-preferred.

Since this new stat is per-task, it changes only /proc/<pid>/sched.
It doesn't update /proc/schedstat. Hence increasing the schedstat version
is not necessary.

Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260928053728.797539-10-sshegde@linux.ibm.com
This commit is contained in:
Shrikanth Hegde 2026-09-28 11:07:24 +05:30 committed by Peter Zijlstra
parent 74699f56eb
commit 68957caaa9
3 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/sched.h
View File

@ -554,6 +554,7 @@ struct sched_statistics {
u64 nr_failed_migrations_running;
u64 nr_failed_migrations_hot;
u64 nr_forced_migrations;
u64 nr_migrations_cpu_non_preferred;
u64 nr_wakeups;
u64 nr_wakeups_sync;

9
kernel/sched/core.c
View File

@ -11288,8 +11288,13 @@ static int sched_non_preferred_cpu_push_stop(void *arg)
update_rq_clock(rq);
context_unsafe_alias(rq);
if (task_rq(p) == rq && task_on_rq_queued(p))
rq = __migrate_task(rq, &rf, p, cpu);
if (task_rq(p) == rq && task_on_rq_queued(p)) {
struct rq *dest_rq = __migrate_task(rq, &rf, p, cpu);
if (rq != dest_rq)
schedstat_inc(p->stats.nr_migrations_cpu_non_preferred);
rq = dest_rq;
}
rq_unlock(rq, &rf);
}

1
kernel/sched/debug.c
View File

@ -1440,6 +1440,7 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
P_SCHEDSTAT(nr_failed_migrations_running);
P_SCHEDSTAT(nr_failed_migrations_hot);
P_SCHEDSTAT(nr_forced_migrations);
P_SCHEDSTAT(nr_migrations_cpu_non_preferred);
P_SCHEDSTAT(nr_wakeups);
P_SCHEDSTAT(nr_wakeups_sync);
P_SCHEDSTAT(nr_wakeups_migrate);