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sched/cache: Check local_group only once in update_sg_lb_stats()

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There is no need to check the local group twice for both
group_asym_packing and group_smt_balance. Adjust the code
to facilitate future checks for group types (cache-aware
load balancing) as well.

No functional changes are expected.

Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Co-developed-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/99a57865c8ae1847087a5c00e92d24351cf3e5a8.1775065312.git.tim.c.chen@linux.intel.com
This commit is contained in:
Tim Chen 2026-04-01 14:52:23 -07:00 committed by Peter Zijlstra
parent 15ad45fb80
commit 9a5e22fbb0
1 changed files with 9 additions and 7 deletions
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16
kernel/sched/fair.c
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@ -11385,14 +11385,16 @@ 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->idle && sgs->sum_h_nr_running &&
sched_group_asym(env, sgs, group))
sgs->group_asym_packing = 1;
if (!local_group) {
/* Check if dst CPU is idle and preferred to this group */
if (env->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))
sgs->group_smt_balance = 1;
/* Check for loaded SMT group to be balanced to dst CPU */
if (smt_balance(env, sgs, group))
sgs->group_smt_balance = 1;
}
sgs->group_type = group_classify(env->sd->imbalance_pct, group, sgs);