diff options
| author | Qais Yousef | 2021-12-16 22:53:20 +0000 |
|---|---|---|
| committer | Peter Zijlstra | 2022-01-27 12:57:19 +0100 |
| commit | d37aee9018e68b0d356195caefbb651910e0bbfa (patch) | |
| tree | cd2c674175ed844cb277502a19c363d392e1161a | |
| parent | 7a17e1db1265471f7718af100cfc5e41280d53a7 (diff) | |
sched/uclamp: Fix iowait boost escaping uclamp restriction
iowait_boost signal is applied independently of util and doesn't take
into account uclamp settings of the rq. An io heavy task that is capped
by uclamp_max could still request higher frequency because
sugov_iowait_apply() doesn't clamp the boost via uclamp_rq_util_with()
like effective_cpu_util() does.
Make sure that iowait_boost honours uclamp requests by calling
uclamp_rq_util_with() when applying the boost.
Fixes: 982d9cdc22c9 ("sched/cpufreq, sched/uclamp: Add clamps for FAIR and RT tasks")
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20211216225320.2957053-3-qais.yousef@arm.com
| -rw-r--r-- | kernel/sched/cpufreq_schedutil.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 62d98b09aaa5..6d65ab6e484e 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -289,6 +289,7 @@ static void sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time) * into the same scale so we can compare. */ boost = (sg_cpu->iowait_boost * sg_cpu->max) >> SCHED_CAPACITY_SHIFT; + boost = uclamp_rq_util_with(cpu_rq(sg_cpu->cpu), boost, NULL); if (sg_cpu->util < boost) sg_cpu->util = boost; } |