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Date: Mon, 26 May 2014 18:19:36 -0400
From: Nicolas Pitre <nicolas.pitre@...aro.org>
To: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Morten Rasmussen <morten.rasmussen@....com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org
Subject: [PATCH v2 3/6] sched/fair.c: disambiguate existing/remaining
"capacity" usage
We have "power" (which should actually become "capacity") and "capacity"
which is a scaled down "capacity factor" in terms of unitary tasks.
Let's use "capacity_factor" to make room for proper usage of "capacity"
later.
Signed-off-by: Nicolas Pitre <nico@...aro.org>
---
kernel/sched/fair.c | 42 +++++++++++++++++++++---------------------
1 file changed, 21 insertions(+), 21 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8f9ac4826c..87a39559cc 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5532,7 +5532,7 @@ struct sg_lb_stats {
unsigned long load_per_task;
unsigned long group_power;
unsigned int sum_nr_running; /* Nr tasks running in the group */
- unsigned int group_capacity;
+ unsigned int group_capacity_factor;
unsigned int idle_cpus;
unsigned int group_weight;
int group_imb; /* Is there an imbalance in the group ? */
@@ -5827,15 +5827,15 @@ static inline int sg_imbalanced(struct sched_group *group)
}
/*
- * Compute the group capacity.
+ * Compute the group capacity factor.
*
* Avoid the issue where N*frac(smt_power) >= 1 creates 'phantom' cores by
* first dividing out the smt factor and computing the actual number of cores
* and limit power unit capacity with that.
*/
-static inline int sg_capacity(struct lb_env *env, struct sched_group *group)
+static inline int sg_capacity_factor(struct lb_env *env, struct sched_group *group)
{
- unsigned int capacity, smt, cpus;
+ unsigned int capacity_factor, smt, cpus;
unsigned int power, power_orig;
power = group->sgp->power;
@@ -5844,13 +5844,13 @@ static inline int sg_capacity(struct lb_env *env, struct sched_group *group)
/* smt := ceil(cpus / power), assumes: 1 < smt_power < 2 */
smt = DIV_ROUND_UP(SCHED_POWER_SCALE * cpus, power_orig);
- capacity = cpus / smt; /* cores */
+ capacity_factor = cpus / smt; /* cores */
- capacity = min_t(unsigned, capacity, DIV_ROUND_CLOSEST(power, SCHED_POWER_SCALE));
- if (!capacity)
- capacity = fix_small_capacity(env->sd, group);
+ capacity_factor = min_t(unsigned, capacity_factor, DIV_ROUND_CLOSEST(power, SCHED_POWER_SCALE));
+ if (!capacity_factor)
+ capacity_factor = fix_small_capacity(env->sd, group);
- return capacity;
+ return capacity_factor;
}
/**
@@ -5900,9 +5900,9 @@ static inline void update_sg_lb_stats(struct lb_env *env,
sgs->group_weight = group->group_weight;
sgs->group_imb = sg_imbalanced(group);
- sgs->group_capacity = sg_capacity(env, group);
+ sgs->group_capacity_factor = sg_capacity_factor(env, group);
- if (sgs->group_capacity > sgs->sum_nr_running)
+ if (sgs->group_capacity_factor > sgs->sum_nr_running)
sgs->group_has_free_capacity = 1;
}
@@ -5927,7 +5927,7 @@ static bool update_sd_pick_busiest(struct lb_env *env,
if (sgs->avg_load <= sds->busiest_stat.avg_load)
return false;
- if (sgs->sum_nr_running > sgs->group_capacity)
+ if (sgs->sum_nr_running > sgs->group_capacity_factor)
return true;
if (sgs->group_imb)
@@ -6018,17 +6018,17 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd
/*
* In case the child domain prefers tasks go to siblings
- * first, lower the sg capacity to one so that we'll try
+ * first, lower the sg capacity factor to one so that we'll try
* and move all the excess tasks away. We lower the capacity
* of a group only if the local group has the capacity to fit
- * these excess tasks, i.e. nr_running < group_capacity. The
+ * these excess tasks, i.e. nr_running < group_capacity_factor. The
* extra check prevents the case where you always pull from the
* heaviest group when it is already under-utilized (possible
* with a large weight task outweighs the tasks on the system).
*/
if (prefer_sibling && sds->local &&
sds->local_stat.group_has_free_capacity)
- sgs->group_capacity = min(sgs->group_capacity, 1U);
+ sgs->group_capacity_factor = min(sgs->group_capacity_factor, 1U);
if (update_sd_pick_busiest(env, sds, sg, sgs)) {
sds->busiest = sg;
@@ -6202,7 +6202,7 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s
* have to drop below capacity to reach cpu-load equilibrium.
*/
load_above_capacity =
- (busiest->sum_nr_running - busiest->group_capacity);
+ (busiest->sum_nr_running - busiest->group_capacity_factor);
load_above_capacity *= (SCHED_LOAD_SCALE * SCHED_POWER_SCALE);
load_above_capacity /= busiest->group_power;
@@ -6346,7 +6346,7 @@ static struct rq *find_busiest_queue(struct lb_env *env,
int i;
for_each_cpu_and(i, sched_group_cpus(group), env->cpus) {
- unsigned long power, capacity, wl;
+ unsigned long power, capacity_factor, wl;
enum fbq_type rt;
rq = cpu_rq(i);
@@ -6375,9 +6375,9 @@ static struct rq *find_busiest_queue(struct lb_env *env,
continue;
power = power_of(i);
- capacity = DIV_ROUND_CLOSEST(power, SCHED_POWER_SCALE);
- if (!capacity)
- capacity = fix_small_capacity(env->sd, group);
+ capacity_factor = DIV_ROUND_CLOSEST(power, SCHED_POWER_SCALE);
+ if (!capacity_factor)
+ capacity_factor = fix_small_capacity(env->sd, group);
wl = weighted_cpuload(i);
@@ -6385,7 +6385,7 @@ static struct rq *find_busiest_queue(struct lb_env *env,
* When comparing with imbalance, use weighted_cpuload()
* which is not scaled with the cpu power.
*/
- if (capacity && rq->nr_running == 1 && wl > env->imbalance)
+ if (capacity_factor && rq->nr_running == 1 && wl > env->imbalance)
continue;
/*
--
1.8.4.108.g55ea5f6
--
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