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| author | Peter Zijlstra <peterz@infradead.org> | 2021-01-20 15:05:41 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-01-22 15:09:43 +0100 |
| commit | 975707f227b07a8212060f94447171d15d7a681b (patch) | |
| tree | b9703358195945550846d0e59259178cf5274d83 /kernel/sched/sched.h | |
| parent | workqueue: Restrict affinity change to rescuer (diff) | |
| download | linux-975707f227b07a8212060f94447171d15d7a681b.tar.xz linux-975707f227b07a8212060f94447171d15d7a681b.zip | |
sched: Prepare to use balance_push in ttwu()
In preparation of using the balance_push state in ttwu() we need it to
provide a reliable and consistent state.
The immediate problem is that rq->balance_callback gets cleared every
schedule() and then re-set in the balance_push_callback() itself. This
is not a reliable signal, so add a variable that stays set during the
entire time.
Also move setting it before the synchronize_rcu() in
sched_cpu_deactivate(), such that we get guaranteed visibility to
ttwu(), which is a preempt-disable region.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Tested-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20210121103506.966069627@infradead.org
Diffstat (limited to '')
| -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 12ada79d40f3..bb09988451a0 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -975,6 +975,7 @@ struct rq { unsigned long cpu_capacity_orig; struct callback_head *balance_callback; + unsigned char balance_push; unsigned char nohz_idle_balance; unsigned char idle_balance; |