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SubjectRe: [PATCH v4 2/4] perf stat: add event unit and scale support
On Thu, Oct 31, 2013 at 03:59:40PM +0100, Stephane Eranian wrote:
> This patch adds perf stat support fo rhandling event units and
> scales as exported by the kernel.
>
> The kernel can export PMU events actual unit and scaling factor
> via sysfs:
> $ ls -1 /sys/devices/power/events/energy-*
> /sys/devices/power/events/energy-cores
> /sys/devices/power/events/energy-cores.scale
> /sys/devices/power/events/energy-cores.unit
> /sys/devices/power/events/energy-pkg
> /sys/devices/power/events/energy-pkg.scale
> /sys/devices/power/events/energy-pkg.unit
> $ cat /sys/devices/power/events/energy-cores.scale
> 2.3e-10
> $ cat cat /sys/devices/power/events/energy-cores.unit
> Joules
>
> This patch modifies the pmu event alias code to check
> for the presence of the .unit and .scale files to load
> the corresponding values. They are then used by perf stat
> transparentely:
>

wrt our previous conversation, attached patch is what
I meant (based on your changes)

you could get rid of following functions:
pmu_event_unit
pmu_event_scale
pmu_get_event_unit_scale

and have the unit/scale processing within the alias code

the name that matters is the term name which is available
in the parse_events_add_pmu as one of the terms

jirka
---
tools/perf/util/parse-events.c | 29 ++++++++-----
tools/perf/util/pmu.c | 92 +++++++++++++++---------------------------
tools/perf/util/pmu.h | 6 +--
3 files changed, 53 insertions(+), 74 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index be7eba8..90ae328 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -269,9 +269,10 @@ const char *event_type(int type)



-static int __add_event(struct list_head *list, int *idx,
- struct perf_event_attr *attr,
- char *name, struct cpu_map *cpus)
+static struct perf_evsel *
+__add_event(struct list_head *list, int *idx,
+ struct perf_event_attr *attr,
+ char *name, struct cpu_map *cpus)
{
struct perf_evsel *evsel;

@@ -279,19 +280,19 @@ static int __add_event(struct list_head *list, int *idx,

evsel = perf_evsel__new(attr, (*idx)++);
if (!evsel)
- return -ENOMEM;
+ return NULL;

evsel->cpus = cpus;
if (name)
evsel->name = strdup(name);
list_add_tail(&evsel->node, list);
- return 0;
+ return evsel;
}

static int add_event(struct list_head *list, int *idx,
struct perf_event_attr *attr, char *name)
{
- return __add_event(list, idx, attr, name, NULL);
+ return __add_event(list, idx, attr, name, NULL) ? 0 : -ENOMEM;
}

static int parse_aliases(char *str, const char *names[][PERF_EVSEL__MAX_ALIASES], int size)
@@ -633,6 +634,9 @@ int parse_events_add_pmu(struct list_head *list, int *idx,
{
struct perf_event_attr attr;
struct perf_pmu *pmu;
+ struct perf_evsel *evsel;
+ char *unit;
+ double scale;

pmu = perf_pmu__find(name);
if (!pmu)
@@ -640,7 +644,7 @@ int parse_events_add_pmu(struct list_head *list, int *idx,

memset(&attr, 0, sizeof(attr));

- if (perf_pmu__check_alias(pmu, head_config))
+ if (perf_pmu__check_alias(pmu, head_config, &unit, &scale))
return -EINVAL;

/*
@@ -652,8 +656,14 @@ int parse_events_add_pmu(struct list_head *list, int *idx,
if (perf_pmu__config(pmu, &attr, head_config))
return -EINVAL;

- return __add_event(list, idx, &attr, pmu_event_name(head_config),
- pmu->cpus);
+ evsel = __add_event(list, idx, &attr, pmu_event_name(head_config),
+ pmu->cpus);
+ if (evsel) {
+ evsel->unit = unit;
+ evsel->scale = scale;
+ }
+
+ return evsel ? 0 : -ENOMEM;
}

int parse_events__modifier_group(struct list_head *list,
@@ -838,7 +848,6 @@ int parse_events_name(struct list_head *list, char *name)
list_for_each_entry(evsel, list, node) {
if (!evsel->name)
evsel->name = strdup(name);
- pmu_get_event_unit_scale(evsel);
}

return 0;
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index e18ef87..df68d43 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -620,16 +620,42 @@ static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
return NULL;
}

+
+static int check_unit_scale(struct perf_pmu_alias *alias,
+ char **unit, double *scale)
+{
+ /*
+ * Only one term in event definition can
+ * define unit and scale, fail if there's
+ * more than one.
+ */
+ if ((*unit && alias->unit) ||
+ (*scale && alias->scale))
+ return -EINVAL;
+
+ if (alias->unit)
+ *unit = alias->unit;
+
+ if (alias->scale)
+ *scale = alias->scale;
+
+ return 0;
+}
+
/*
* Find alias in the terms list and replace it with the terms
* defined for the alias
*/
-int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms)
+int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
+ char **unit, double *scale)
{
struct parse_events_term *term, *h;
struct perf_pmu_alias *alias;
int ret;

+ *unit = NULL;
+ *scale = 0;
+
list_for_each_entry_safe(term, h, head_terms, list) {
alias = pmu_find_alias(pmu, term);
if (!alias)
@@ -637,6 +663,11 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms)
ret = pmu_alias_terms(alias, &term->list);
if (ret)
return ret;
+
+ ret = check_unit_scale(alias, unit, scale);
+ if (ret)
+ return ret;
+
list_del(&term->list);
free(term);
}
@@ -760,62 +791,3 @@ bool pmu_have_event(const char *pname, const char *name)
}
return false;
}
-
-static const char *pmu_event_unit(struct perf_pmu *pmu, const char *name)
-{
- struct perf_pmu_alias *alias;
- char buf[1024];
- char *fname;
- const char *unit = "?";
-
- if (!name)
- return unit;
-
- list_for_each_entry(alias, &pmu->aliases, list) {
- fname = format_alias(buf, sizeof(buf), pmu, alias);
- if (!strcmp(fname, name)) {
- unit = alias->unit;
- break;
- }
- }
- return unit;
-}
-
-static double pmu_event_scale(struct perf_pmu *pmu, const char *name)
-{
- struct perf_pmu_alias *alias;
- char buf[1024];
- char *fname;
- double scale = 1.0;
-
- if (!name)
- return 1.0;
-
- list_for_each_entry(alias, &pmu->aliases, list) {
- fname = format_alias(buf, sizeof(buf), pmu, alias);
- if (!strcmp(fname, name)) {
- scale = alias->scale;
- break;
- }
- }
- return scale;
-}
-
-int pmu_get_event_unit_scale(struct perf_evsel *evsel)
-{
- __u32 type = evsel->attr.type;
- struct perf_pmu *pmu;
-
- if (!evsel->name)
- return -1;
-
- list_for_each_entry(pmu, &pmus, list) {
- if (pmu->type == type)
- goto found;
- }
- return -1;
-found:
- evsel->unit = pmu_event_unit(pmu, evsel->name);
- evsel->scale = pmu_event_scale(pmu, evsel->name);
- return 0;
-}
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 6bf23b2..9183380 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -4,7 +4,6 @@
#include <linux/bitops.h>
#include <linux/perf_event.h>
#include <stdbool.h>
-#include "util/evsel.h"

enum {
PERF_PMU_FORMAT_VALUE_CONFIG,
@@ -29,7 +28,8 @@ int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
int perf_pmu__config_terms(struct list_head *formats,
struct perf_event_attr *attr,
struct list_head *head_terms);
-int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms);
+int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
+ char **unit, double *scale);
struct list_head *perf_pmu__alias(struct perf_pmu *pmu,
struct list_head *head_terms);
int perf_pmu_wrap(void);
@@ -46,6 +46,4 @@ void print_pmu_events(const char *event_glob, bool name_only);
bool pmu_have_event(const char *pname, const char *name);

int perf_pmu__test(void);
-
-int pmu_get_event_unit_scale(struct perf_evsel *evsel);
#endif /* __PMU_H */
--
1.7.11.7


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