diff options
author | Arjan van de Ven <arjan@linux.intel.com> | 2009-09-12 07:52:51 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-09-19 11:42:11 +0200 |
commit | 8755a8f27ae590dde225f9005ee18c6d9c4c6d78 (patch) | |
tree | 1a86744bf0f5ee71bc5f2d0c29f86f9721aa6f4a /tools/perf/util/parse-events.c | |
parent | perf: Add a timestamp to fork events (diff) | |
download | linux-8755a8f27ae590dde225f9005ee18c6d9c4c6d78.tar.xz linux-8755a8f27ae590dde225f9005ee18c6d9c4c6d78.zip |
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 '')
-rw-r--r-- | tools/perf/util/parse-events.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index a9bdcab8c070..89172fd0038b 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; |