diff options
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/cpufreq_schedutil.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 5c41ea367422..b3a878aa593d 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -13,6 +13,8 @@ #include <linux/sched/cpufreq.h> #include <trace/events/power.h> +#define IOWAIT_BOOST_MIN (SCHED_CAPACITY_SCALE / 8) + struct sugov_tunables { struct gov_attr_set attr_set; unsigned int rate_limit_us; @@ -51,7 +53,6 @@ struct sugov_cpu { u64 last_update; unsigned long bw_dl; - unsigned long min; unsigned long max; /* The field below is for single-CPU policies only: */ @@ -291,8 +292,8 @@ static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu) * * The IO wait boost of a task is disabled after a tick since the last update * of a CPU. If a new IO wait boost is requested after more then a tick, then - * we enable the boost starting from the minimum frequency, which improves - * energy efficiency by ignoring sporadic wakeups from IO. + * we enable the boost starting from IOWAIT_BOOST_MIN, which improves energy + * efficiency by ignoring sporadic wakeups from IO. */ static bool sugov_iowait_reset(struct sugov_cpu *sg_cpu, u64 time, bool set_iowait_boost) @@ -303,7 +304,7 @@ static bool sugov_iowait_reset(struct sugov_cpu *sg_cpu, u64 time, if (delta_ns <= TICK_NSEC) return false; - sg_cpu->iowait_boost = set_iowait_boost ? sg_cpu->min : 0; + sg_cpu->iowait_boost = set_iowait_boost ? IOWAIT_BOOST_MIN : 0; sg_cpu->iowait_boost_pending = set_iowait_boost; return true; @@ -317,8 +318,9 @@ static bool sugov_iowait_reset(struct sugov_cpu *sg_cpu, u64 time, * * Each time a task wakes up after an IO operation, the CPU utilization can be * boosted to a certain utilization which doubles at each "frequent and - * successive" wakeup from IO, ranging from the utilization of the minimum - * OPP to the utilization of the maximum OPP. + * successive" wakeup from IO, ranging from IOWAIT_BOOST_MIN to the utilization + * of the maximum OPP. + * * To keep doubling, an IO boost has to be requested at least once per tick, * otherwise we restart from the utilization of the minimum OPP. */ @@ -349,7 +351,7 @@ static void sugov_iowait_boost(struct sugov_cpu *sg_cpu, u64 time, } /* First wakeup after IO: start with minimum boost */ - sg_cpu->iowait_boost = sg_cpu->min; + sg_cpu->iowait_boost = IOWAIT_BOOST_MIN; } /** @@ -389,7 +391,7 @@ static unsigned long sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time, * No boost pending; reduce the boost value. */ sg_cpu->iowait_boost >>= 1; - if (sg_cpu->iowait_boost < sg_cpu->min) { + if (sg_cpu->iowait_boost < IOWAIT_BOOST_MIN) { sg_cpu->iowait_boost = 0; return util; } @@ -826,9 +828,6 @@ static int sugov_start(struct cpufreq_policy *policy) memset(sg_cpu, 0, sizeof(*sg_cpu)); sg_cpu->cpu = cpu; sg_cpu->sg_policy = sg_policy; - sg_cpu->min = - (SCHED_CAPACITY_SCALE * policy->cpuinfo.min_freq) / - policy->cpuinfo.max_freq; } for_each_cpu(cpu, policy->cpus) { |