diff options
| author | Morten Rasmussen <morten.rasmussen@arm.com> | 2018-07-04 11:17:41 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-09-10 11:05:49 +0200 |
| commit | e3d6d0cb66f2351cbfd09fbae04eb9804afe9577 (patch) | |
| tree | 6524c337de8430a84cbc13bc0156a51e7fb36735 /kernel/sched/sched.h | |
| parent | 3b1baa6496e6b7ad016342a9d256bdfb072ce902 (diff) | |
sched/fair: Add sched_group per-CPU max capacity
The current sg->min_capacity tracks the lowest per-CPU compute capacity
available in the sched_group when rt/irq pressure is taken into account.
Minimum capacity isn't the ideal metric for tracking if a sched_group
needs offloading to another sched_group for some scenarios, e.g. a
sched_group with multiple CPUs if only one is under heavy pressure.
Tracking maximum capacity isn't perfect either but a better choice for
some situations as it indicates that the sched_group definitely compute
capacity constrained either due to rt/irq pressure on all CPUs or
asymmetric CPU capacities (e.g. big.LITTLE).
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dietmar.eggemann@arm.com
Cc: gaku.inami.xh@renesas.com
Cc: valentin.schneider@arm.com
Cc: vincent.guittot@linaro.org
Link: http://lkml.kernel.org/r/1530699470-29808-4-git-send-email-morten.rasmussen@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/sched.h')
| -rw-r--r-- | kernel/sched/sched.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 7dbf67d147a2..fe17e0be2d7b 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1197,6 +1197,7 @@ struct sched_group_capacity { */ unsigned long capacity; unsigned long min_capacity; /* Min per-CPU capacity in group */ + unsigned long max_capacity; /* Max per-CPU capacity in group */ unsigned long next_update; int imbalance; /* XXX unrelated to capacity but shared group state */ |