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sched: Add sched_avg::utilization_avg_contrib

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Add new statistics which reflect the average time a task is running on the CPU
and the sum of these running time of the tasks on a runqueue. The latter is
named utilization_load_avg.

This patch is based on the usage metric that was proposed in the 1st
versions of the per-entity load tracking patchset by Paul Turner
<pjt@google.com> but that has be removed afterwards. This version differs from
the original one in the sense that it's not linked to task_group.

The rq's utilization_load_avg will be used to check if a rq is overloaded or
not instead of trying to compute how many tasks a group of CPUs can handle.

Rename runnable_avg_period into avg_period as it is now used with both
runnable_avg_sum and running_avg_sum.

Add some descriptions of the variables to explain their differences.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Paul Turner <pjt@google.com>
Cc: Ben Segall <bsegall@google.com>
Cc: Ben Segall <bsegall@google.com>
Cc: Morten.Rasmussen@arm.com
Cc: Paul Turner <pjt@google.com>
Cc: dietmar.eggemann@arm.com
Cc: efault@gmx.de
Cc: kamalesh@linux.vnet.ibm.com
Cc: linaro-kernel@lists.linaro.org
Cc: nicolas.pitre@linaro.org
Cc: preeti@linux.vnet.ibm.com
Cc: riel@redhat.com
Link: http://lkml.kernel.org/r/1425052454-25797-2-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Vincent Guittot
2015-02-27 16:54:04 +01:00
committed by Ingo Molnar
parent b6366f048e
commit 36ee28e45d
4 changed files with 89 additions and 24 deletions
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21
include/linux/sched.h
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@@ -1115,15 +1115,28 @@ struct load_weight {
};
struct sched_avg {
u64 last_runnable_update;
s64 decay_count;
/*
* utilization_avg_contrib describes the amount of time that a
* sched_entity is running on a CPU. It is based on running_avg_sum
* and is scaled in the range [0..SCHED_LOAD_SCALE].
* load_avg_contrib described the amount of time that a sched_entity
* is runnable on a rq. It is based on both runnable_avg_sum and the
* weight of the task.
*/
unsigned long load_avg_contrib, utilization_avg_contrib;
/*
* These sums represent an infinite geometric series and so are bound
* above by 1024/(1-y). Thus we only need a u32 to store them for all
* choices of y < 1-2^(-32)*1024.
* running_avg_sum reflects the time that the sched_entity is
* effectively running on the CPU.
* runnable_avg_sum represents the amount of time a sched_entity is on
* a runqueue which includes the running time that is monitored by
* running_avg_sum.
*/
u32 runnable_avg_sum, runnable_avg_period;
u64 last_runnable_update;
s64 decay_count;
unsigned long load_avg_contrib;
u32 runnable_avg_sum, avg_period, running_avg_sum;
};
#ifdef CONFIG_SCHEDSTATS