perf tools: Add per-pkg format file parsing

The .per-pkg file indicates that all but one value per socket should be
discarded. Adding support to check up this file and set event flag
accordingly.

This patch is part of Matt's original patch:

http://marc.info/?l=linux-kernel&m=141527675002139&w=2 only the file
parsing part, the rest is solved differently.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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: Jiri Olsa <jolsa@kernel.org>
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/1416562275-12404-9-git-send-email-jolsa@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 31 insertions, 0 deletions

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 5c93bed8e8d9..792b0ea8a8b8 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -91,6 +91,7 @@ struct perf_evsel {
         bool                    immediate;
         bool                    system_wide;
         bool                    tracking;
+        bool                    per_pkg;
         /* parse modifier helper */
         int                     exclude_GH;
         int                     nr_members;
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index c659a3ca1283..5a373483f0e4 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -681,6 +681,7 @@ int parse_events_add_pmu(struct list_head *list, int *idx,
         if (evsel) {
                 evsel->unit = info.unit;
                 evsel->scale = info.scale;
+                evsel->per_pkg = info.per_pkg;
         }
 
         return evsel ? 0 : -ENOMEM;
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 881b75490533..f003b5a9e059 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -163,6 +163,24 @@ error:
         return -1;
 }
 
+static int
+perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name)
+{
+        char path[PATH_MAX];
+        int fd;
+
+        snprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name);
+
+        fd = open(path, O_RDONLY);
+        if (fd == -1)
+                return -1;
+
+        close(fd);
+
+        alias->per_pkg = true;
+        return 0;
+}
+
 static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
 {
         struct perf_pmu_alias *alias;
@@ -181,6 +199,7 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
         INIT_LIST_HEAD(&alias->terms);
         alias->scale = 1.0;
         alias->unit[0] = '\0';
+        alias->per_pkg = false;
 
         ret = parse_events_terms(&alias->terms, buf);
         if (ret) {
@@ -194,6 +213,7 @@ 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);
 
         list_add_tail(&alias->list, list);
 
@@ -209,6 +229,8 @@ static inline bool pmu_alias_info_file(char *name)
                 return true;
         if (len > 6 && !strcmp(name + len - 6, ".scale"))
                 return true;
+        if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
+                return true;
 
         return false;
 }
@@ -649,6 +671,8 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
         struct perf_pmu_alias *alias;
         int ret;
 
+        info->per_pkg = false;
+
         /*
          * Mark unit and scale as not set
          * (different from default values, see below)
@@ -668,6 +692,9 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
                 if (ret)
                         return ret;
 
+                if (alias->per_pkg)
+                        info->per_pkg = true;
+
                 list_del(&term->list);
                 free(term);
         }
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 8092de78e818..c3a74e0e17a2 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -29,6 +29,7 @@ struct perf_pmu {
 struct perf_pmu_info {
         const char *unit;
         double scale;
+        bool per_pkg;
 };
 
 #define UNIT_MAX_LEN    31 /* max length for event unit name */
@@ -39,6 +40,7 @@ struct perf_pmu_alias {
         struct list_head list;  /* ELEM */
         char unit[UNIT_MAX_LEN+1];
         double scale;
+        bool per_pkg;
 };
 
 struct perf_pmu *perf_pmu__find(const char *name);