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From: Lin Ming on 22 Jul 2010 07:20
Software events are exported under /sys/kernel/events/, for example

/sys/kernel/events/
|-- alignment-faults
| |-- config
| `-- type
|-- context-switches
| |-- config
| `-- type
|-- cpu-clock
| |-- config
| `-- type
|-- cpu-migrations
| |-- config
| `-- type
|-- emulation-faults
| |-- config
| `-- type
|-- major-faults
| |-- config
| `-- type
|-- minor-faults
| |-- config
| `-- type
|-- page-faults
| |-- config
| `-- type
.....
---
kernel/perf_event.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 61 insertions(+), 0 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 1f51ab9..21c359d 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4383,6 +4383,22 @@ static int perf_swevent_init(struct perf_event *event)
return 0;
}

+struct kobject *sys_kernel_events_kobj;
+static char *perf_sw_event_name(int id);
+
+static void perf_swevent_export(void)
+{
+ int i;
+
+ if (!sys_kernel_events_kobj)
+ return;
+
+ for (i = PERF_COUNT_SW_PAGE_FAULTS; i < PERF_COUNT_SW_MAX; i++) {
+ perf_sys_add_event(sys_kernel_events_kobj, perf_sw_event_name(i),
+ i, PERF_TYPE_SOFTWARE);
+ }
+}
+
static struct pmu perf_swevent = {
.event_init = perf_swevent_init,
.add = perf_swevent_add,
@@ -4390,6 +4406,7 @@ static struct pmu perf_swevent = {
.start = perf_swevent_start,
.stop = perf_swevent_stop,
.read = perf_swevent_read,
+ .export_events = perf_swevent_export,
};

#ifdef CONFIG_EVENT_TRACING
@@ -4662,6 +4679,16 @@ static int cpu_clock_event_init(struct perf_event *event)
return 0;
}

+static void cpu_clock_event_export(void)
+{
+ if (!sys_kernel_events_kobj)
+ return;
+
+ perf_sys_add_event(sys_kernel_events_kobj,
+ perf_sw_event_name(PERF_COUNT_SW_CPU_CLOCK),
+ PERF_COUNT_SW_CPU_CLOCK, PERF_TYPE_SOFTWARE);
+}
+
static struct pmu perf_cpu_clock = {
.event_init = cpu_clock_event_init,
.add = cpu_clock_event_add,
@@ -4669,6 +4696,7 @@ static struct pmu perf_cpu_clock = {
.start = cpu_clock_event_start,
.stop = cpu_clock_event_stop,
.read = cpu_clock_event_read,
+ .export_events = cpu_clock_event_export,
};

/*
@@ -4737,6 +4765,16 @@ static int task_clock_event_init(struct perf_event *event)
return 0;
}

+static void task_clock_event_export(void)
+{
+ if (!sys_kernel_events_kobj)
+ return;
+
+ perf_sys_add_event(sys_kernel_events_kobj,
+ perf_sw_event_name(PERF_COUNT_SW_TASK_CLOCK),
+ PERF_COUNT_SW_TASK_CLOCK, PERF_TYPE_SOFTWARE);
+}
+
static struct pmu perf_task_clock = {
.event_init = task_clock_event_init,
.add = task_clock_event_add,
@@ -4744,6 +4782,7 @@ static struct pmu perf_task_clock = {
.start = task_clock_event_start,
.stop = task_clock_event_stop,
.read = task_clock_event_read,
+ .export_events = task_clock_event_export,
};

static LIST_HEAD(pmus);
@@ -5887,6 +5926,8 @@ static int __init perf_event_sysfs_init(void)
struct pmu *pmu = NULL;
int idx;

+ sys_kernel_events_kobj = perf_sys_create_events_dir(kernel_kobj);
+
idx = srcu_read_lock(&pmus_srcu);
list_for_each_entry_rcu(pmu, &pmus, entry) {
if (pmu->export_events)
@@ -6033,6 +6074,18 @@ static char *hw_cache_result[] = {
"misses",
};

+static char *sw_event_names[] = {
+ "cpu-clock",
+ "task-clock",
+ "page-faults",
+ "minor-faults",
+ "major-faults",
+ "context-switches",
+ "cpu-migrations",
+ "alignment-faults",
+ "emulation-faults",
+};
+
char *perf_hw_event_name(int id)
{
if (id >= ARRAY_SIZE(hw_event_names))
@@ -6051,3 +6104,11 @@ char *perf_hw_cache_event_name(u8 cache_type, u8 cache_op, u8 cache_result)

return name;
}
+
+static char *perf_sw_event_name(int id)
+{
+ if (id >= ARRAY_SIZE(sw_event_names))
+ return NULL;
+
+ return sw_event_names[id];
+}



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