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sched/fair: ignore backup CPU when not valid

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The find_best_target can sometimes not return a valid backup CPU, either
because it cannot find one or just becasue it returns prev_cpu as a backup.
In these cases we should skip the energy_diff evaluation for the backup CPU.

Change-Id: I3787dbdfe74122348dd7a7485b88c4679051bd32
Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
(cherry picked from commit d9bcf5b88594a0225b51878236e49305f272eadc)
[trivial cherry-pick issue]
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
This commit is contained in:
Patrick Bellasi
2017-09-07 12:27:56 +01:00
committed by Todd Kjos
parent 6abf18bda9
commit 78ff98b3aa
1 changed files with 3 additions and 1 deletions
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4
kernel/sched/fair.c
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@@ -7071,7 +7071,9 @@ static int select_energy_cpu_brute(struct task_struct *p, int prev_cpu, int sync
/* No energy saving for target_cpu, try backup */
target_cpu = tmp_backup;
eenv.dst_cpu = target_cpu;
if (tmp_backup < 0 || energy_diff(&eenv) >= 0) {
if (tmp_backup < 0 ||
tmp_backup == prev_cpu ||
energy_diff(&eenv) >= 0) {
schedstat_inc(p->se.statistics.nr_wakeups_secb_no_nrg_sav);
schedstat_inc(this_rq()->eas_stats.secb_no_nrg_sav);
target_cpu = prev_cpu;