Messages in this thread Patch in this message | | | From | Valentin Schneider <> | Subject | [PATCH v3 7/9] sched/fair: Dissociate wakeup decisions from SD flag value | Date | Wed, 15 Apr 2020 22:05:10 +0100 |
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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 b0bf98e6798b..f20e5cd6515c 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6642,7 +6642,7 @@ 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()) { @@ -6679,9 +6679,8 @@ 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
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