cpufreq: schedutil: Don't skip freq update when limits change

[linux-2.6-microblaze.git] / kernel / sched / cpufreq_schedutil.c

diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index 636ca6f..867b4bb 100644 (file)
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -40,6 +40,7 @@ struct sugov_policy {
        struct task_struct      *thread;
        bool                    work_in_progress;
 
+       bool                    limits_changed;
        bool                    need_freq_update;
 };
 
@@ -89,8 +90,11 @@ static bool sugov_should_update_freq(struct sugov_policy *sg_policy, u64 time)
            !cpufreq_this_cpu_can_update(sg_policy->policy))
                return false;
 
-       if (unlikely(sg_policy->need_freq_update))
+       if (unlikely(sg_policy->limits_changed)) {
+               sg_policy->limits_changed = false;
+               sg_policy->need_freq_update = true;
                return true;
+       }
 
        delta_ns = time - sg_policy->last_freq_update_time;
 
@@ -437,7 +441,7 @@ static inline bool sugov_cpu_is_busy(struct sugov_cpu *sg_cpu) { return false; }
 static inline void ignore_dl_rate_limit(struct sugov_cpu *sg_cpu, struct sugov_policy *sg_policy)
 {
        if (cpu_bw_dl(cpu_rq(sg_cpu->cpu)) > sg_cpu->bw_dl)
-               sg_policy->need_freq_update = true;
+               sg_policy->limits_changed = true;
 }
 
 static void sugov_update_single(struct update_util_data *hook, u64 time,
@@ -457,7 +461,8 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
        if (!sugov_should_update_freq(sg_policy, time))
                return;
 
-       busy = sugov_cpu_is_busy(sg_cpu);
+       /* Limits may have changed, don't skip frequency update */
+       busy = !sg_policy->need_freq_update && sugov_cpu_is_busy(sg_cpu);
 
        util = sugov_get_util(sg_cpu);
        max = sg_cpu->max;
@@ -831,6 +836,7 @@ static int sugov_start(struct cpufreq_policy *policy)
        sg_policy->last_freq_update_time        = 0;
        sg_policy->next_freq                    = 0;
        sg_policy->work_in_progress             = false;
+       sg_policy->limits_changed               = false;
        sg_policy->need_freq_update             = false;
        sg_policy->cached_raw_freq              = 0;
 
@@ -879,7 +885,7 @@ static void sugov_limits(struct cpufreq_policy *policy)
                mutex_unlock(&sg_policy->work_lock);
        }
 
-       sg_policy->need_freq_update = true;
+       sg_policy->limits_changed = true;
 }
 
 struct cpufreq_governor schedutil_gov = {