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Subject[PATCH 2/4] omap: cpu: Implement callbacks for cpu frequency tracking in cpuacct
Date
Implement OMAP platform specific scheduler callbacks for tracking
cpu frequencies per cpuacct cgroup.

Signed-off-by: Mike Chan <mike@android.com>
---
arch/arm/plat-omap/cpu-omap.c | 66 ++++++++++++++++++++++++++++++++++++++++-
1 files changed, 65 insertions(+), 1 deletions(-)

diff --git a/arch/arm/plat-omap/cpu-omap.c b/arch/arm/plat-omap/cpu-omap.c
index 6d3d333..d27234d 100644
--- a/arch/arm/plat-omap/cpu-omap.c
+++ b/arch/arm/plat-omap/cpu-omap.c
@@ -21,6 +21,7 @@
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
+#include <linux/cpuacct.h>

#include <mach/hardware.h>
#include <plat/clock.h>
@@ -38,6 +39,10 @@ static struct cpufreq_frequency_table *freq_table;

static struct clk *mpu_clk;

+#ifdef CONFIG_CGROUP_CPUACCT
+static int freq_index;
+#endif
+
/* TODO: Add support for SDRAM timing changes */

int omap_verify_speed(struct cpufreq_policy *policy)
@@ -96,6 +101,11 @@ static int omap_target(struct cpufreq_policy *policy,
freqs.old, freqs.new);
#endif
ret = clk_set_rate(mpu_clk, freqs.new * 1000);
+#ifdef CONFIG_CGROUP_CPUACCT
+ /* Update freq_index before cpufreq transition post notification. */
+ cpufreq_frequency_table_target(policy, freq_table, freqs.new,
+ CPUFREQ_RELATION_L, &freq_index);
+#endif
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);

return ret;
@@ -125,7 +135,14 @@ static int __init omap_cpu_init(struct cpufreq_policy *policy)
policy->cpuinfo.max_freq = clk_round_rate(mpu_clk,
VERY_HI_RATE) / 1000;
}
-
+#ifdef CONFIG_CGROUP_CPUACCT
+ /*
+ * Update freq_index, since we are using the extact frequency
+ * we can use any relation.
+ */
+ cpufreq_frequency_table_target(policy, freq_table, policy->cur,
+ CPUFREQ_RELATION_L, &freq_index);
+#endif
/* FIXME: what's the actual transition time? */
policy->cpuinfo.transition_latency = 300 * 1000;

@@ -169,3 +186,50 @@ arch_initcall(omap_cpufreq_init);
* cpufreq_frequency_table_put_attr()
*/

+#ifdef CONFIG_CGROUP_CPUACCT
+/*
+ * Omap platform calls for cpuacct frequency accounting.
+ */
+
+static void omap_cpuacct_freq_init(void **cpuacct_data)
+{
+ *cpuacct_data = kzalloc(sizeof(u64) * MAX_VDD1_OPP,
+ GFP_KERNEL);
+}
+
+/* Called with rcu_read_lock() held. */
+static void omap_cpuacct_freq_charge(void *cpuacct_data, u64 cputime, unsigned int cpu)
+{
+ u64 *cpuacct_freq = cpuacct_data;
+ if (freq_index < 0)
+ return;
+
+ cpuacct_freq[freq_index] += cputime;
+}
+
+static void omap_cpuacct_freq_show(void *cpuacct_data, struct cgroup_map_cb *cb)
+{
+ int i;
+ char buf[32];
+ u64 *cpuacct_freq = cpuacct_data;
+ for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
+ snprintf(buf, sizeof(buf), "%u", freq_table[i].frequency);
+ cb->fill(cb, buf, cpuacct_freq[i]);
+ }
+}
+
+static struct cpuacct_cpufreq_calls omap_cpuacct_cpufreq = {
+ .init = omap_cpuacct_freq_init,
+ .charge = omap_cpuacct_freq_charge,
+ .show = omap_cpuacct_freq_show,
+};
+
+static int __init omap_cpuacct_init(void)
+{
+ freq_index = -1;
+ cpuacct_register_cpufreq(&omap_cpuacct_cpufreq);
+ return 0;
+}
+
+early_initcall(omap_cpuacct_init);
+#endif
--
1.7.0.1


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