Messages in this thread Patch in this message | | | From | John Stultz <> | Subject | [PATCH 4/5] scheduler: cpuacct: Enable platform callbacks for cpuacct power tracking | Date | Fri, 19 Nov 2010 18:08:53 -0800 |
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From: Mike Chan <mike@android.com>
Platform must register cpu power function that return power in milliWatt seconds.
CC: Ingo Molnar <mingo@elte.hu> CC: Peter Zijlstra <peterz@infradead.org> Change-Id: I1caa0335e316c352eee3b1ddf326fcd4942bcbe8 Signed-off-by: Mike Chan <mike@android.com> Signed-off-by: John Stultz <john.stultz@linaro.org> --- Documentation/cgroups/cpuacct.txt | 3 +++ include/linux/cpuacct.h | 4 +++- kernel/sched.c | 24 ++++++++++++++++++++++-- 3 files changed, 28 insertions(+), 3 deletions(-)
diff --git a/Documentation/cgroups/cpuacct.txt b/Documentation/cgroups/cpuacct.txt index 600d2d0..84e471b 100644 --- a/Documentation/cgroups/cpuacct.txt +++ b/Documentation/cgroups/cpuacct.txt @@ -44,6 +44,9 @@ cpuacct.cpufreq file gives CPU time (in nanoseconds) spent at each CPU frequency. Platform hooks must be implemented inorder to properly track time at each CPU frequency. +cpuacct.power file gives CPU power consumed (in milliWatt seconds). Platform +must provide and implement power callback functions. + cpuacct controller uses percpu_counter interface to collect user and system times. This has two side effects: diff --git a/include/linux/cpuacct.h b/include/linux/cpuacct.h index 560df02..8f68e73 100644 --- a/include/linux/cpuacct.h +++ b/include/linux/cpuacct.h @@ -31,7 +31,9 @@ struct cpuacct_charge_calls { */ void (*init) (void **cpuacct_data); void (*charge) (void *cpuacct_data, u64 cputime, unsigned int cpu); - void (*show) (void *cpuacct_data, struct cgroup_map_cb *cb); + void (*cpufreq_show) (void *cpuacct_data, struct cgroup_map_cb *cb); + /* Returns power consumed in milliWatt seconds */ + u64 (*power_usage) (void *cpuacct_data); }; int cpuacct_charge_register(struct cpuacct_charge_calls *fn); diff --git a/kernel/sched.c b/kernel/sched.c index 35055fc..270d34a 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -9282,12 +9282,28 @@ static int cpuacct_cpufreq_show(struct cgroup *cgrp, struct cftype *cft, struct cgroup_map_cb *cb) { struct cpuacct *ca = cgroup_ca(cgrp); - if (ca->cpufreq_fn && ca->cpufreq_fn->show) - ca->cpufreq_fn->show(ca->cpuacct_data, cb); + if (ca->cpufreq_fn && ca->cpufreq_fn->cpufreq_show) + ca->cpufreq_fn->cpufreq_show(ca->cpuacct_data, cb); return 0; } +/* return total cpu power usage (milliWatt second) of a group */ +static u64 cpuacct_powerusage_read(struct cgroup *cgrp, struct cftype *cft) +{ + int i; + struct cpuacct *ca = cgroup_ca(cgrp); + u64 totalpower = 0; + + if (ca->cpufreq_fn && ca->cpufreq_fn->power_usage) + for_each_present_cpu(i) { + totalpower += ca->cpufreq_fn->power_usage( + ca->cpuacct_data); + } + + return totalpower; +} + static struct cftype files[] = { { .name = "usage", @@ -9306,6 +9322,10 @@ static struct cftype files[] = { .name = "cpufreq", .read_map = cpuacct_cpufreq_show, }, + { + .name = "power", + .read_u64 = cpuacct_powerusage_read + }, }; static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp) -- 1.7.3.2.146.gca209
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