On 29.09.2020 16:55, Andrey Ryabinin wrote:
> Add update_rq_clock() for 'target_rq' to avoid WARN() coming
> from attach_task(). Also add update_rq_clock(env.src_rq); in
> load_balance() for detach_task().
>
> https://jira.sw.ru/browse/PSBM-108013
> Reported-by: Kirill Tkhai
> Signed-off-by: Andrey Ryabinin
> ---
> kernel/sched/fair.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index e6dc21d5fa03..99dcb9e77efd 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -7817,6 +7817,7 @@ static int cpulimit_balance_cpu_stop(void *data)
> schedstat_inc(sd->clb_count);
>
> update_rq_clock(rq);
> + update_rq_clock(target_rq);
> if (do_cpulimit_balance())
> schedstat_inc(sd->clb_pushed);
> else
> @@ -9177,6 +9178,7 @@ static int load_balance(int this_cpu, struct rq
> *this_rq,
> env.loop = 0;
> local_irq_save(rf.flags);
> double_rq_lock(env.dst_rq, busiest);
> + update_rq_clock(env.src_rq);
Fortunately, we may avoid update_rq_clock here, since srq_rq clock are already
updated.
Also, I'm afraid this will bring to SCHED_WARN_ON(rq->clock_update_flags &
RQCF_UPDATED)
in this function. It looks we should use rq_repin_lock() here instead:
@@ -9177,6 +9177,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
env.loop = 0;
local_irq_save(rf.flags);
double_rq_lock(env.dst_rq, busiest);
+ rq_repin_lock(rq, );
update_rq_clock(env.dst_rq);
cur_ld_moved = ld_moved = move_task_groups();
double_rq_unlock(env.dst_rq, busiest);
> update_rq_clock(env.dst_rq);
> cur_ld_moved = ld_moved = move_task_groups();
> double_rq_unlock(env.dst_rq, busiest);
>
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