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 <ktk...@virtuozzo.com> > Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com> > --- > 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(&env)) > 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, &rf); update_rq_clock(env.dst_rq); cur_ld_moved = ld_moved = move_task_groups(&env); double_rq_unlock(env.dst_rq, busiest); > update_rq_clock(env.dst_rq); > cur_ld_moved = ld_moved = move_task_groups(&env); > double_rq_unlock(env.dst_rq, busiest); > _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel