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Date: Fri, 14 Nov 2014 21:15:03 +0000
From: Matt Fleming <matt@...sole-pimps.org>
To: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Andi Kleen <andi@...stfloor.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
"H. Peter Anvin" <hpa@...or.com>,
Kanaka Juvva <kanaka.d.juvva@...el.com>,
Jiri Olsa <jolsa@...nel.org>
Subject: [PATCH 02/11] perf tools: Implement snapshot event file logic
From: Jiri Olsa <jolsa@...nel.org>
Adding support to parse and read the snapshot file,
and using this information to omit the compute_delta
function logic.
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
tools/perf/util/evsel.c | 6 ++++--
tools/perf/util/evsel.h | 1 +
tools/perf/util/parse-events.c | 1 +
tools/perf/util/pmu.c | 47 ++++++++++++++++++++++++++++++++----------
tools/perf/util/pmu.h | 2 ++
5 files changed, 44 insertions(+), 13 deletions(-)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 4aced93672a8..a7a26b46e21c 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -900,7 +900,8 @@ int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
return -errno;
- compute_deltas(evsel, cpu, &count);
+ if (!evsel->snapshot)
+ compute_deltas(evsel, cpu, &count);
if (scale) {
if (count.run == 0)
@@ -947,7 +948,8 @@ int __perf_evsel__read(struct perf_evsel *evsel,
}
}
- compute_deltas(evsel, -1, aggr);
+ if (!evsel->snapshot)
+ compute_deltas(evsel, -1, aggr);
evsel->counts->scaled = 0;
if (scale) {
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 13ca8a7693e4..d9fa85e203f8 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -73,6 +73,7 @@ struct perf_evsel {
char *name;
double scale;
const char *unit;
+ bool snapshot;
struct event_format *tp_format;
union {
void *priv;
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 5a373483f0e4..77b43fe43d55 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -682,6 +682,7 @@ int parse_events_add_pmu(struct list_head *list, int *idx,
evsel->unit = info.unit;
evsel->scale = info.scale;
evsel->per_pkg = info.per_pkg;
+ evsel->snapshot = info.snapshot;
}
return evsel ? 0 : -ENOMEM;
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index f003b5a9e059..5c9c4947cfb4 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -181,6 +181,23 @@ perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name)
return 0;
}
+static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
+ char *dir, char *name)
+{
+ char path[PATH_MAX];
+ int fd;
+
+ snprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1)
+ return -1;
+
+ alias->snapshot = true;
+ close(fd);
+ return 0;
+}
+
static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
{
struct perf_pmu_alias *alias;
@@ -214,6 +231,7 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
perf_pmu__parse_unit(alias, dir, name);
perf_pmu__parse_scale(alias, dir, name);
perf_pmu__parse_per_pkg(alias, dir, name);
+ perf_pmu__parse_snapshot(alias, dir, name);
list_add_tail(&alias->list, list);
@@ -231,6 +249,8 @@ static inline bool pmu_alias_info_file(char *name)
return true;
if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
return true;
+ if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
+ return true;
return false;
}
@@ -639,23 +659,27 @@ static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
}
-static int check_unit_scale(struct perf_pmu_alias *alias,
- const char **unit, double *scale)
+static int check_info_data(struct perf_pmu_alias *alias,
+ struct perf_pmu_info *info)
{
/*
* Only one term in event definition can
- * define unit and scale, fail if there's
- * more than one.
+ * define unit, scale and snapshot, fail
+ * if there's more than one.
*/
- if ((*unit && alias->unit) ||
- (*scale && alias->scale))
+ if ((info->unit && alias->unit) ||
+ (info->scale && alias->scale) ||
+ (info->snapshot && alias->snapshot))
return -EINVAL;
if (alias->unit)
- *unit = alias->unit;
+ info->unit = alias->unit;
if (alias->scale)
- *scale = alias->scale;
+ info->scale = alias->scale;
+
+ if (alias->snapshot)
+ info->snapshot = alias->snapshot;
return 0;
}
@@ -677,8 +701,9 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
* Mark unit and scale as not set
* (different from default values, see below)
*/
- info->unit = NULL;
- info->scale = 0.0;
+ info->unit = NULL;
+ info->scale = 0.0;
+ info->snapshot = false;
list_for_each_entry_safe(term, h, head_terms, list) {
alias = pmu_find_alias(pmu, term);
@@ -688,7 +713,7 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
if (ret)
return ret;
- ret = check_unit_scale(alias, &info->unit, &info->scale);
+ ret = check_info_data(alias, info);
if (ret)
return ret;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index c3a74e0e17a2..6b1249fbdb5f 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -30,6 +30,7 @@ struct perf_pmu_info {
const char *unit;
double scale;
bool per_pkg;
+ bool snapshot;
};
#define UNIT_MAX_LEN 31 /* max length for event unit name */
@@ -41,6 +42,7 @@ struct perf_pmu_alias {
char unit[UNIT_MAX_LEN+1];
double scale;
bool per_pkg;
+ bool snapshot;
};
struct perf_pmu *perf_pmu__find(const char *name);
--
1.9.3
--
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