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sched: Compute runnable load avg in cpu_load and cpu_avg_load_per_task

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They are the base values in load balance, update them with rq runnable
load average, then the load balance will consider runnable load avg
naturally.

We also try to include the blocked_load_avg as cpu load in balancing,
but that cause kbuild performance drop 6% on every Intel machine, and
aim7/oltp drop on some of 4 CPU sockets machines.
Or only add blocked_load_avg into get_rq_runable_load, hackbench still
drop a little on NHM EX.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Reviewed-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1371694737-29336-7-git-send-email-alex.shi@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Alex Shi
2013-06-20 10:18:50 +08:00
committed by Ingo Molnar
parent 83dfd5235e
commit b92486cbf2
2 changed files with 18 additions and 4 deletions
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17
kernel/sched/proc.c
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@@ -501,6 +501,18 @@ static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
sched_avg_update(this_rq);
}
#ifdef CONFIG_SMP
unsigned long get_rq_runnable_load(struct rq *rq)
{
return rq->cfs.runnable_load_avg;
}
#else
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
@@ -522,7 +534,7 @@ static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
void update_idle_cpu_load(struct rq *this_rq)
{
unsigned long curr_jiffies = ACCESS_ONCE(jiffies);
unsigned long load = this_rq->load.weight;
unsigned long load = get_rq_runnable_load(this_rq);
unsigned long pending_updates;
/*
@@ -568,11 +580,12 @@ 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, this_rq->load.weight, 1);
__update_cpu_load(this_rq, load, 1);
calc_load_account_active(this_rq);
}