[PATCH v2 5/6] sched/fair: pack SD_ASYM_PACKING into sched_use_asym_prio

From: alexs
Date: Tue Jan 30 2024 - 08:15:17 EST


From: Alex Shi <alexs@xxxxxxxxxx>

Then the flags check passed into sched_asym and sched_group_asym.
It's a code cleanup, no func changes.

Signed-off-by: Alex Shi <alexs@xxxxxxxxxx>
To: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>
To: Ben Segall <bsegall@xxxxxxxxxx>
To: Steven Rostedt <rostedt@xxxxxxxxxxx>
To: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
To: Valentin Schneider <vschneid@xxxxxxxxxx>
To: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
To: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
To: Juri Lelli <juri.lelli@xxxxxxxxxx>
To: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
To: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/fair.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 835dbe77b260..6680cb39c787 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9741,6 +9741,9 @@ 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;
+
return (!sched_smt_active()) ||
(sd->flags & SD_SHARE_CPUCAPACITY) || is_core_idle(cpu);
}
@@ -9935,11 +9938,9 @@ 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))
@@ -11035,9 +11036,7 @@ 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) {
@@ -11133,7 +11132,7 @@ 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) &&
+ 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));
--
2.43.0