jolsa at redhat
Jul 3, 2012, 3:00 PM
Post #1 of 10
(104 views)
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[PATCH 04/10] perf, x86: Making hardware events translations available in sysfs
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Making hardware events translations available through the sysfs.
Adding 'events' group attribute under the sysfs x86 PMU record
with attribute/file for each hardware event:
# ls /sys/devices/cpu/events/
branch_instructions
branch_misses
bus_cycles
cache_misses
cache_references
cycles
instructions
ref_cycles
stalled_cycles_backend
stalled_cycles_frontend
The file - hw event ID mappings is:
file hw event ID
---------------------------------------------------------------
cycles PERF_COUNT_HW_CPU_CYCLES
instructions PERF_COUNT_HW_INSTRUCTIONS
cache_references PERF_COUNT_HW_CACHE_REFERENCES
cache_misses PERF_COUNT_HW_CACHE_MISSES
branch_instructions PERF_COUNT_HW_BRANCH_INSTRUCTIONS
branch_misses PERF_COUNT_HW_BRANCH_MISSES
bus_cycles PERF_COUNT_HW_BUS_CYCLES
stalled_cycles_frontend PERF_COUNT_HW_STALLED_CYCLES_FRONTEND
stalled_cycles_backend PERF_COUNT_HW_STALLED_CYCLES_BACKEND
ref_cycles PERF_COUNT_HW_REF_CPU_CYCLES
Each file in 'events' directory contains term translation for the
symbolic hw event for the currently running cpu model.
# cat /sys/devices/cpu/events/instructions
config=0xc0
Signed-off-by: Jiri Olsa <jolsa [at] redhat>
---
arch/x86/kernel/cpu/perf_event.c | 44 ++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 41db515..e7aab56 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1666,9 +1666,53 @@ static struct attribute_group x86_pmu_attr_group = {
.attrs = x86_pmu_attrs,
};
+#define PMU_EVENTS_ATTR_CONFIG(_name, _id) \
+static ssize_t \
+_name##_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char *page) \
+{ \
+ u64 val = x86_pmu.event_map(_id); \
+ BUILD_BUG_ON(_id >= PERF_COUNT_HW_MAX); \
+ return sprintf(page, "config=0x%llx\n", val); \
+} \
+ \
+static struct device_attribute event_attr_##_name = __ATTR_RO(_name)
+
+PMU_EVENTS_ATTR_CONFIG(cycles, PERF_COUNT_HW_CPU_CYCLES);
+PMU_EVENTS_ATTR_CONFIG(instructions, PERF_COUNT_HW_INSTRUCTIONS);
+PMU_EVENTS_ATTR_CONFIG(cache_references, PERF_COUNT_HW_CACHE_REFERENCES);
+PMU_EVENTS_ATTR_CONFIG(cache_misses, PERF_COUNT_HW_CACHE_MISSES);
+PMU_EVENTS_ATTR_CONFIG(branch_instructions, PERF_COUNT_HW_BRANCH_INSTRUCTIONS);
+PMU_EVENTS_ATTR_CONFIG(branch_misses, PERF_COUNT_HW_BRANCH_MISSES);
+PMU_EVENTS_ATTR_CONFIG(bus_cycles, PERF_COUNT_HW_BUS_CYCLES);
+PMU_EVENTS_ATTR_CONFIG(stalled_cycles_frontend, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND);
+PMU_EVENTS_ATTR_CONFIG(stalled_cycles_backend, PERF_COUNT_HW_STALLED_CYCLES_BACKEND);
+PMU_EVENTS_ATTR_CONFIG(ref_cycles, PERF_COUNT_HW_REF_CPU_CYCLES);
+
+static struct attribute *events_attr[] = {
+ &event_attr_cycles.attr,
+ &event_attr_instructions.attr,
+ &event_attr_cache_references.attr,
+ &event_attr_cache_misses.attr,
+ &event_attr_branch_instructions.attr,
+ &event_attr_branch_misses.attr,
+ &event_attr_bus_cycles.attr,
+ &event_attr_stalled_cycles_frontend.attr,
+ &event_attr_stalled_cycles_backend.attr,
+ &event_attr_ref_cycles.attr,
+ NULL,
+};
+
+static struct attribute_group x86_pmu_events_group = {
+ .name = "events",
+ .attrs = events_attr,
+};
+
static const struct attribute_group *x86_pmu_attr_groups[] = {
&x86_pmu_attr_group,
&x86_pmu_format_group,
+ &x86_pmu_events_group,
NULL,
};
--
1.7.10.4
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