The cpu_load is the copy of rq->cfs.runnable_load_avg. And it updated on time. So we can use the latter directly. Thus saved 2 rq variables: cpu_load and nr_load_updates. Then don't need __update_cpu_load(), just keep sched_avg_update(). Thus removed get_rq_runnable_load() which used for update_cpu_load only.
Signed-off-by: Alex Shi alex.shi@linaro.org --- kernel/sched/core.c | 2 -- kernel/sched/debug.c | 2 -- kernel/sched/proc.c | 55 +++++++++++++--------------------------------------- kernel/sched/sched.h | 2 -- 4 files changed, 13 insertions(+), 48 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index c156c9b..11968df 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6855,8 +6855,6 @@ void __init sched_init(void) #ifdef CONFIG_RT_GROUP_SCHED init_tg_rt_entry(&root_task_group, &rq->rt, NULL, i, NULL); #endif - - rq->cpu_load = 0; rq->last_load_update_tick = jiffies;
#ifdef CONFIG_SMP diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index a24d549..83737ce 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -298,12 +298,10 @@ do { \ SEQ_printf(m, " .%-30s: %lu\n", "load", rq->load.weight); P(nr_switches); - P(nr_load_updates); P(nr_uninterruptible); PN(next_balance); SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr))); PN(clock); - P(cpu_load); #undef P #undef PN
diff --git a/kernel/sched/proc.c b/kernel/sched/proc.c index 383c4ba..dd3c2d9 100644 --- a/kernel/sched/proc.c +++ b/kernel/sched/proc.c @@ -8,12 +8,19 @@
#include "sched.h"
+#ifdef CONFIG_SMP unsigned long this_cpu_load(void) { - struct rq *this = this_rq(); - return this->cpu_load; + struct rq *rq = this_rq(); + return rq->cfs.runnable_load_avg; } - +#else +unsigned long this_cpu_load(void) +{ + struct rq *rq = this_rq(); + return rq->load.weight; +} +#endif
/* * Global load-average calculations @@ -398,34 +405,6 @@ static void calc_load_account_active(struct rq *this_rq) * End of global load-average stuff */
- -/* - * Update rq->cpu_load statistics. This function is usually called every - * scheduler tick (TICK_NSEC). With tickless idle this will not be called - * every tick. We fix it up based on jiffies. - */ -static void __update_cpu_load(struct rq *this_rq, unsigned long this_load) -{ - this_rq->nr_load_updates++; - - /* Update our load: */ - this_rq->cpu_load = this_load; /* Fasttrack for idx 0 */ - - sched_avg_update(this_rq); -} - -#ifdef CONFIG_SMP -static inline unsigned long get_rq_runnable_load(struct rq *rq) -{ - return rq->cfs.runnable_load_avg; -} -#else -static inline unsigned long get_rq_runnable_load(struct rq *rq) -{ - return rq->load.weight; -} -#endif - #ifdef CONFIG_NO_HZ_COMMON /* * There is no sane way to deal with nohz on smp when using jiffies because the @@ -447,17 +426,15 @@ static inline unsigned long get_rq_runnable_load(struct rq *rq) void update_idle_cpu_load(struct rq *this_rq) { unsigned long curr_jiffies = ACCESS_ONCE(jiffies); - unsigned long load = get_rq_runnable_load(this_rq);
/* * bail if there's load or we're actually up-to-date. */ - if (load || curr_jiffies == this_rq->last_load_update_tick) + if (curr_jiffies == this_rq->last_load_update_tick) return;
this_rq->last_load_update_tick = curr_jiffies; - - __update_cpu_load(this_rq, load); + sched_avg_update(this_rq); }
/* @@ -466,7 +443,6 @@ void update_idle_cpu_load(struct rq *this_rq) void update_cpu_load_nohz(void) { struct rq *this_rq = this_rq(); - update_idle_cpu_load(this_rq); } #endif /* CONFIG_NO_HZ */ @@ -476,12 +452,7 @@ void update_cpu_load_nohz(void) */ void update_cpu_load_active(struct rq *this_rq) { - unsigned long load = get_rq_runnable_load(this_rq); - /* - * See the mess around update_idle_cpu_load() / update_cpu_load_nohz(). - */ this_rq->last_load_update_tick = jiffies; - __update_cpu_load(this_rq, load); - + sched_avg_update(this_rq); calc_load_account_active(this_rq); } diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 30efb79..0213f52 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -516,7 +516,6 @@ struct rq { unsigned int nr_numa_running; unsigned int nr_preferred_running; #endif - unsigned long cpu_load; unsigned long last_load_update_tick; #ifdef CONFIG_NO_HZ_COMMON u64 nohz_stamp; @@ -529,7 +528,6 @@ struct rq {
/* capture load from *all* tasks on this cpu: */ struct load_weight load; - unsigned long nr_load_updates; u64 nr_switches;
struct cfs_rq cfs;