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authorArjan van de Ven <arjan@linux.intel.com>2009-09-12 07:52:51 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-19 11:42:11 +0200
commit8755a8f27ae590dde225f9005ee18c6d9c4c6d78 (patch)
tree1a86744bf0f5ee71bc5f2d0c29f86f9721aa6f4a /tools
parent393b2ad8c757ba3ccd2a99ca5bbcd6db4d3fa53d (diff)
perf: Store trace event name/id pairs in perf.data
The trace event name<->id mapping is dynamic for each kernel compile. In order for perf.data to be useable outside the actual system, we thus need to store a table of this mapping for later use. This patch adds this table to perf.data, and provides helper functions for lookup up fields from this table. To avoid mistakes, lookup-from-table is kept completely seprate from lookup-from-local-debugfs. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20090912130405.6960d099@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/header.c59
-rw-r--r--tools/perf/util/header.h6
-rw-r--r--tools/perf/util/parse-events.c25
3 files changed, 90 insertions, 0 deletions
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index ec4d4c2f952..ef911458399 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -86,6 +86,44 @@ void perf_header__add_attr(struct perf_header *self,
self->attr[pos] = attr;
}
+struct perf_trace_event_type {
+ u64 event_id;
+ char name[64];
+};
+
+static int event_count;
+static struct perf_trace_event_type *events;
+
+void perf_header__push_event(u64 id, const char *name)
+{
+ if (strlen(name) > 64)
+ printf("Event %s will be truncated\n", name);
+
+ if (!events) {
+ events = malloc(sizeof(struct perf_trace_event_type));
+ if (!events)
+ die("nomem");
+ } else {
+ events = realloc(events, (event_count + 1) * sizeof(struct perf_trace_event_type));
+ if (!events)
+ die("nomem");
+ }
+ memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
+ events[event_count].event_id = id;
+ strncpy(events[event_count].name, name, 63);
+ event_count++;
+}
+
+char *perf_header__find_event(u64 id)
+{
+ int i;
+ for (i = 0 ; i < event_count; i++) {
+ if (events[i].event_id == id)
+ return events[i].name;
+ }
+ return NULL;
+}
+
static const char *__perf_magic = "PERFFILE";
#define PERF_MAGIC (*(u64 *)__perf_magic)
@@ -106,6 +144,7 @@ struct perf_file_header {
u64 attr_size;
struct perf_file_section attrs;
struct perf_file_section data;
+ struct perf_file_section event_types;
};
static void do_write(int fd, void *buf, size_t size)
@@ -154,6 +193,11 @@ void perf_header__write(struct perf_header *self, int fd)
do_write(fd, &f_attr, sizeof(f_attr));
}
+ self->event_offset = lseek(fd, 0, SEEK_CUR);
+ self->event_size = event_count * sizeof(struct perf_trace_event_type);
+ if (events)
+ do_write(fd, events, self->event_size);
+
self->data_offset = lseek(fd, 0, SEEK_CUR);
@@ -169,6 +213,10 @@ void perf_header__write(struct perf_header *self, int fd)
.offset = self->data_offset,
.size = self->data_size,
},
+ .event_types = {
+ .offset = self->event_offset,
+ .size = self->event_size,
+ },
};
lseek(fd, 0, SEEK_SET);
@@ -234,6 +282,17 @@ struct perf_header *perf_header__read(int fd)
lseek(fd, tmp, SEEK_SET);
}
+ if (f_header.event_types.size) {
+ lseek(fd, f_header.event_types.offset, SEEK_SET);
+ events = malloc(f_header.event_types.size);
+ if (!events)
+ die("nomem");
+ do_read(fd, events, f_header.event_types.size);
+ event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
+ }
+ self->event_offset = f_header.event_types.offset;
+ self->event_size = f_header.event_types.size;
+
self->data_offset = f_header.data.offset;
self->data_size = f_header.data.size;
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 5d0a72ecc91..7b0e84a8717 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -19,6 +19,8 @@ struct perf_header {
s64 attr_offset;
u64 data_offset;
u64 data_size;
+ u64 event_offset;
+ u64 event_size;
};
struct perf_header *perf_header__read(int fd);
@@ -27,6 +29,10 @@ void perf_header__write(struct perf_header *self, int fd);
void perf_header__add_attr(struct perf_header *self,
struct perf_header_attr *attr);
+void perf_header__push_event(u64 id, const char *name);
+char *perf_header__find_event(u64 id);
+
+
struct perf_header_attr *
perf_header_attr__new(struct perf_counter_attr *attr);
void perf_header_attr__add_id(struct perf_header_attr *self, u64 id);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index a9bdcab8c07..89172fd0038 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -6,6 +6,7 @@
#include "exec_cmd.h"
#include "string.h"
#include "cache.h"
+#include "header.h"
int nr_counters;
@@ -687,11 +688,35 @@ modifier:
return ret;
}
+static void store_event_type(const char *orgname)
+{
+ char filename[PATH_MAX], *c;
+ FILE *file;
+ int id;
+
+ sprintf(filename, "/sys/kernel/debug/tracing/events/%s/id", orgname);
+ c = strchr(filename, ':');
+ if (c)
+ *c = '/';
+
+ file = fopen(filename, "r");
+ if (!file)
+ return;
+ if (fscanf(file, "%i", &id) < 1)
+ die("cannot store event ID");
+ fclose(file);
+ perf_header__push_event(id, orgname);
+}
+
+
int parse_events(const struct option *opt __used, const char *str, int unset __used)
{
struct perf_counter_attr attr;
enum event_result ret;
+ if (strchr(str, ':'))
+ store_event_type(str);
+
for (;;) {
if (nr_counters == MAX_COUNTERS)
return -1;