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sched/fair: Have SD_SERIALIZE affect newidle balancing 

Also serialize the possiblty much more frequent newidle balancing for
the 'expensive' domains that have SD_BALANCE set.

Initial benchmarking by K Prateek and Tim showed no negative effect.

Split out from the larger patch moving sched_balance_running around
for ease of bisect and such.

Suggested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Seconded-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/df068896-82f9-458d-8fff-5a2f654e8ffd@amd.com
Link: https://patch.msgid.link/6fed119b723c71552943bfe5798c93851b30a361.1762800251.git.tim.c.chen@linux.intel.com

# Conflicts:
#	kernel/sched/fair.c
This commit is contained in:
Peter Zijlstra 2025-11-17 17:13:09 +01:00
parent 3324b2180c
commit 522fb20fbd
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/fair.c
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@ -11732,7 +11732,7 @@ static int sched_balance_rq(int this_cpu, struct rq *this_rq,
goto out_balanced;
}
if (!need_unlock && (sd->flags & SD_SERIALIZE) && idle != CPU_NEWLY_IDLE) {
if (!need_unlock && (sd->flags & SD_SERIALIZE)) {
int zero = 0;
if (!atomic_try_cmpxchg_acquire(&sched_balance_running, &zero, 1))
goto out_balanced;