[PATCH v2 7/9] sched/fair: Dissociate wakeup decisions from SD flag value

From: Valentin Schneider <valentin.schneider@arm.com>
To: linux-kernel@vger.kernel.org
Cc: mingo@kernel.org, peterz@infradead.org,
	vincent.guittot@linaro.org, dietmar.eggemann@arm.com
Subject: [PATCH v2 7/9] sched/fair: Dissociate wakeup decisions from SD flag value
Date: Wed, 11 Mar 2020 18:15:59 +0000	[thread overview]
Message-ID: <20200311181601.18314-8-valentin.schneider@arm.com> (raw)
In-Reply-To: <20200311181601.18314-1-valentin.schneider@arm.com>

The CFS wakeup code will only ever go through EAS / its fast path on
"regular" wakeups (i.e. not on forks or execs). These are currently gated
by a check against 'sd_flag', which would be SD_BALANCE_WAKE at wakeup.

However, we now have a flag that explicitly tells us whether a wakeup is a
"regular" one, so hinge those conditions on that flag instead.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
---
 kernel/sched/fair.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 920c4e2ce0d1..f98dac0c7f82 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6606,7 +6606,7 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int wake_flags)
 		sd_flag = SD_BALANCE_EXEC;
 	}
 
-	if (sd_flag & SD_BALANCE_WAKE) {
+	if (wake_flags & WF_TTWU) {
 		record_wakee(p);
 
 		if (sched_energy_enabled()) {
@@ -6643,9 +6643,8 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int wake_flags)
 	if (unlikely(sd)) {
 		/* Slow path */
 		new_cpu = find_idlest_cpu(sd, p, cpu, prev_cpu, sd_flag);
-	} else if (sd_flag & SD_BALANCE_WAKE) { /* XXX always ? */
+	} else if (wake_flags & WF_TTWU) { /* XXX always ? */
 		/* Fast path */
-
 		new_cpu = select_idle_sibling(p, prev_cpu, new_cpu);
 
 		if (want_affine)
-- 
2.24.0

