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Message-ID: <4b0e6966-eb31-4d44-99e2-e33294c7e129@gmail.com>
Date: Fri, 9 Feb 2024 19:12:10 +0800
From: kuiliang Shi <seakeel@...il.com>
To: alexs@...nel.org, Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Valentin Schneider <vschneid@...hat.com>, linux-kernel@...r.kernel.org,
ricardo.neri-calderon@...ux.intel.com, yangyicong@...ilicon.com
Subject: Re: [PATCH v4 4/4] sched/fair: Check the SD_ASYM_PACKING flag in
sched_use_asym_prio()
Hi Valentin&Ricardo,
Any more comment for this patch? or Reviewed-by from you as a Chinese new year gift for this patch? :)
Thanks
Alex
On 2/7/24 11:47 AM, alexs@...nel.org wrote:
> From: Alex Shi <alexs@...nel.org>
>
> sched_use_asym_prio() checks whether CPU priorities should be used. It
> makes sense to check for the SD_ASYM_PACKING() inside the function.
> Since both sched_asym() and sched_group_asym() use sched_use_asym_prio(),
> remove the now superfluous checks for the flag in various places.
>
> Signed-off-by: Alex Shi <alexs@...nel.org>
> To: linux-kernel@...r.kernel.org
> To: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> To: Ben Segall <bsegall@...gle.com>
> To: Steven Rostedt <rostedt@...dmis.org>
> To: Dietmar Eggemann <dietmar.eggemann@....com>
> To: Valentin Schneider <vschneid@...hat.com>
> To: Daniel Bristot de Oliveira <bristot@...hat.com>
> To: Vincent Guittot <vincent.guittot@...aro.org>
> To: Juri Lelli <juri.lelli@...hat.com>
> To: Peter Zijlstra <peterz@...radead.org>
> To: Ingo Molnar <mingo@...hat.com>
> ---
> kernel/sched/fair.c | 16 +++++++---------
> 1 file changed, 7 insertions(+), 9 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 942b6358f683..10ae28e1c088 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -9740,6 +9740,9 @@ group_type group_classify(unsigned int imbalance_pct,
> */
> static bool sched_use_asym_prio(struct sched_domain *sd, int cpu)
> {
> + if (!(sd->flags & SD_ASYM_PACKING))
> + return false;
> +
> if (!sched_smt_active())
> return true;
>
> @@ -9941,11 +9944,9 @@ static inline void update_sg_lb_stats(struct lb_env *env,
> sgs->group_weight = group->group_weight;
>
> /* Check if dst CPU is idle and preferred to this group */
> - if (!local_group && env->sd->flags & SD_ASYM_PACKING &&
> - env->idle != CPU_NOT_IDLE && sgs->sum_h_nr_running &&
> - sched_group_asym(env, sgs, group)) {
> + if (!local_group && env->idle != CPU_NOT_IDLE && sgs->sum_h_nr_running &&
> + sched_group_asym(env, sgs, group))
> sgs->group_asym_packing = 1;
> - }
>
> /* Check for loaded SMT group to be balanced to dst CPU */
> if (!local_group && smt_balance(env, sgs, group))
> @@ -11041,9 +11042,7 @@ static struct rq *find_busiest_queue(struct lb_env *env,
> * If balancing between cores, let lower priority CPUs help
> * SMT cores with more than one busy sibling.
> */
> - if ((env->sd->flags & SD_ASYM_PACKING) &&
> - sched_asym(env->sd, i, env->dst_cpu) &&
> - nr_running == 1)
> + if (sched_asym(env->sd, i, env->dst_cpu) && nr_running == 1)
> continue;
>
> switch (env->migration_type) {
> @@ -11139,8 +11138,7 @@ asym_active_balance(struct lb_env *env)
> * the lower priority @env::dst_cpu help it. Do not follow
> * CPU priority.
> */
> - return env->idle != CPU_NOT_IDLE && (env->sd->flags & SD_ASYM_PACKING) &&
> - sched_use_asym_prio(env->sd, env->dst_cpu) &&
> + return env->idle != CPU_NOT_IDLE && sched_use_asym_prio(env->sd, env->dst_cpu) &&
> (sched_asym_prefer(env->dst_cpu, env->src_cpu) ||
> !sched_use_asym_prio(env->sd, env->src_cpu));
> }
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