perf tools: Add snapshot format file parsing

The .snapshot file indicates that the provided event value is a snapshot
value and we have to bypass the delta computation logic.

Adding support to check up this file and set event flag accordingly.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1416562275-12404-10-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 792b0ea..b18d58d 100644 (file)
--- 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 5a37348..77b43fe 100644 (file)
--- 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 f003b5a..5c9c494 100644 (file)
--- 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 c3a74e0..6b1249f 100644 (file)
--- 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);