On Fri, 2015-04-03 at 15:35 -0700, Tim Chen wrote:
> I think we can get rid of the done_balancing boolean
> and make it a bit easier to read if we change the above code to
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index bcfe320..08317dc 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -7557,8 +7557,13 @@ static void nohz_idle_balance(struct rq *this_rq, enum
> cpu_idle_type idle)
> * work being done for other cpus. Next load
> * balancing owner will pick it up.
> */
> - if (need_resched())
> - break;
> + if (need_resched()) {
> + /* preparing to bail, kicking other cpu to continue */
> + clear_bit(NOHZ_BALANCE_KICK, nohz_flags(this_cpu));
> + if (nohz_kick_needed(this_rq))
> + nohz_balance_kick();
> + return;
> + }
Hi Tim,
We would also need the nohz_kick_needed/nohz_balance_kick if we
initially find that the current CPU is not idle (at the beginning of
nohz_idle_balance). In the above case, we would need to add the code to
2 locations.
Would it be better to still keep the done_balancing to avoid having
duplicate code?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
