[RFCv2 PATCH 05/23] sched: Add energy procfs interface

[Morten Rasmussen]

From: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>

This patch makes the energy data available via procfs. The related files
are placed as sub-directory named 'energy' inside the
/proc/sys/kernel/sched_domain/cpuX/domainY/groupZ directory for those
cpu/domain/group tuples which have energy information.

The following example depicts the contents of
/proc/sys/kernel/sched_domain/cpu0/domain0/group[01] for a system which
has energy information attached to domain level 0.

âââ cpu0
â âââ domain0
â â âââ busy_factor
â â âââ busy_idx
â â âââ cache_nice_tries
â â âââ flags
â â âââ forkexec_idx
â â âââ group0
â â â âââ energy
â â â     âââ cap_states
â â â     âââ idle_states
â â â     âââ nr_cap_states
â â â     âââ nr_idle_states
â â âââ group1
â â â âââ energy
â â â     âââ cap_states
â â â     âââ idle_states
â â â     âââ nr_cap_states
â â â     âââ nr_idle_states
â â âââ idle_idx
â â âââ imbalance_pct
â â âââ max_interval
â â âââ max_newidle_lb_cost
â â âââ min_interval
â â âââ name
â â âââ newidle_idx
â â âââ wake_idx
â âââ domain1
â     âââ busy_factor
â     âââ busy_idx
â     âââ cache_nice_tries
â     âââ flags
â     âââ forkexec_idx
â     âââ idle_idx
â     âââ imbalance_pct
â     âââ max_interval
â     âââ max_newidle_lb_cost
â     âââ min_interval
â     âââ name
â     âââ newidle_idx
â     âââ wake_idx

The files 'nr_idle_states' and 'nr_cap_states' contain a scalar value
whereas 'idle_states' and 'cap_states' contain a vector of (power
consumption, wakeup energy for run->sleep->run cycle for this idle
state) respectively (compute capacity, power consumption at this compute
capacity) tuples.

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
---
 kernel/sched/core.c |   67 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 65 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ecece17..7fecc63 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4931,9 +4931,60 @@ set_table_entry(struct ctl_table *entry,
 }
 
 static struct ctl_table *
+sd_alloc_ctl_energy_table(struct sched_group_energy *sge)
+{
+	struct ctl_table *table = sd_alloc_ctl_entry(5);
+
+	if (table == NULL)
+		return NULL;
+
+	set_table_entry(&table[0], "nr_idle_states", &sge->nr_idle_states,
+			sizeof(int), 0644, proc_dointvec_minmax, false);
+	set_table_entry(&table[1], "idle_states", &sge->idle_states[0].power,
+			sge->nr_idle_states*sizeof(struct idle_state), 0644,
+			proc_doulongvec_minmax, false);
+	set_table_entry(&table[2], "nr_cap_states", &sge->nr_cap_states,
+			sizeof(int), 0644, proc_dointvec_minmax, false);
+	set_table_entry(&table[3], "cap_states", &sge->cap_states[0].cap,
+			sge->nr_cap_states*sizeof(struct capacity_state), 0644,
+			proc_doulongvec_minmax, false);
+
+	return table;
+}
+
+static struct ctl_table *
+sd_alloc_ctl_group_table(struct sched_group *sg)
+{
+	struct ctl_table *table = sd_alloc_ctl_entry(2);
+
+	if (table == NULL)
+		return NULL;
+
+	table->procname = kstrdup("energy", GFP_KERNEL);
+	table->mode = 0555;
+	table->child = sd_alloc_ctl_energy_table(sg->sge);
+
+	return table;
+}
+
+static struct ctl_table *
 sd_alloc_ctl_domain_table(struct sched_domain *sd)
 {
-	struct ctl_table *table = sd_alloc_ctl_entry(14);
+	struct ctl_table *table;
+	unsigned int nr_entries = 14;
+
+	int i = 0;
+	struct sched_group *sg = sd->groups;
+
+	if (sg->sge) {
+		int nr_sgs = 0;
+
+		do {} while (nr_sgs++, sg = sg->next, sg != sd->groups);
+
+		nr_entries += nr_sgs;
+	}
+
+	table = sd_alloc_ctl_entry(nr_entries);
 
 	if (table == NULL)
 		return NULL;
@@ -4966,7 +5017,19 @@ sd_alloc_ctl_domain_table(struct sched_domain *sd)
 		sizeof(long), 0644, proc_doulongvec_minmax, false);
 	set_table_entry(&table[12], "name", sd->name,
 		CORENAME_MAX_SIZE, 0444, proc_dostring, false);
-	/* &table[13] is terminator */
+	sg = sd->groups;
+	if (sg->sge) {
+		char buf[32];
+		struct ctl_table *entry = &table[13];
+
+		do {
+			snprintf(buf, 32, "group%d", i);
+			entry->procname = kstrdup(buf, GFP_KERNEL);
+			entry->mode = 0555;
+			entry->child = sd_alloc_ctl_group_table(sg);
+		} while (entry++, i++, sg = sg->next, sg != sd->groups);
+	}
+	/* &table[nr_entries-1] is terminator */
 
 	return table;
 }
-- 
1.7.9.5


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