[PATCH AUTOSEL 6.6 06/15] sched/debug: Provide slice length for fair tasks

Sasha Levin
2025-02-11T01:31:45Z

From: Christian Loehle <christian.loehle@arm.com>

[ Upstream commit 9065ce69754dece78606c8bbb3821449272e56bf ]

Since commit:

857b158dc5e8 ("sched/eevdf: Use sched_attr::sched_runtime to set request/slice suggestion")

... we have the userspace per-task tunable slice length, which is
a key parameter that is otherwise difficult to obtain, so provide
it in /proc/$PID/sched.

[ mingo: Clarified the changelog. ]

Signed-off-by: Christian Loehle <christian.loehle@arm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/453349b1-1637-42f5-a7b2-2385392b5956@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/sched/debug.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 4c3d0d9f3db63..115e266db76bf 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -1089,6 +1089,8 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
if (task_has_dl_policy(p)) {
P(dl.runtime);
P(dl.deadline);
+ } else if (fair_policy(p->policy)) {
+ P(se.slice);
}
#undef PN_SCHEDSTAT
#undef P_SCHEDSTAT
--
2.39.5