Messages in this thread Patch in this message | | | From | Robert Richter <> | Subject | [PATCH 1/4] perf tool: Parse general/raw events from sysfs | Date | Thu, 15 Dec 2011 18:23:41 +0100 |
| |
From: Lin Ming <ming.m.lin@intel.com>
PMU can export general events to sysfs, for example,
/sys/bus/event_source/devices/uncore/events └── cycle
Then specify the event as <pmu>:<event>,
$ sudo perf stat -a -C 0 -e uncore:cycle ^C Performance counter stats for 'CPU 0':
56,547,314 uncore:cycle
Raw event can be specified as <pmu>:rXXXX
$ sudo perf stat -a -C 0 -e uncore:r0101 ^C Performance counter stats for 'CPU 0':
8,504 uncore:r0101
Signed-off-by: Lin Ming <ming.m.lin@intel.com> --- tools/perf/util/parse-events.c | 84 +++++++++++++++++++++++++++++++++++++++- 1 files changed, 82 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 586ab3f..4ce9404 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -685,7 +685,7 @@ parse_symbolic_event(const char **strp, struct perf_event_attr *attr) } static enum event_result -parse_raw_event(const char **strp, struct perf_event_attr *attr) +parse_raw_config(const char **strp, struct perf_event_attr *attr) { const char *str = *strp; u64 config; @@ -700,7 +700,6 @@ parse_raw_event(const char **strp, struct perf_event_attr *attr) return EVT_FAILED; *strp = end; - attr->type = PERF_TYPE_RAW; attr->config = config; return EVT_HANDLED; } @@ -708,6 +707,83 @@ parse_raw_event(const char **strp, struct perf_event_attr *attr) } static enum event_result +parse_raw_event(const char **strp, struct perf_event_attr *attr) +{ + if (parse_raw_config(strp, attr) != EVT_HANDLED) + return EVT_FAILED; + + attr->type = PERF_TYPE_RAW; + return EVT_HANDLED; +} + +#define EVENT_SOURCE_DIR "/sys/bus/event_source/devices" + +static u64 read_sysfs_entry(const char *path) +{ + char buf[19]; + int fd; + + fd = open(path, O_RDONLY); + if (fd < 0) + return -1; + + if (read(fd, buf, sizeof(buf)) < 0) { + close(fd); + return -1; + } + + close(fd); + return atoll(buf); +} + +static u64 get_pmu_type(const char *pmu_name) +{ + char evt_path[MAXPATHLEN]; + + snprintf(evt_path, MAXPATHLEN, "%s/%s/type", EVENT_SOURCE_DIR, + pmu_name); + + return read_sysfs_entry(evt_path); +} + +static u64 get_pmu_event_config(const char *pmu_name, const char *evt_name) +{ + char evt_path[MAXPATHLEN]; + + snprintf(evt_path, MAXPATHLEN, "%s/%s/events/%s", EVENT_SOURCE_DIR, + pmu_name, evt_name); + + return read_sysfs_entry(evt_path); +} + +static enum event_result +parse_sysfs_event(const char **strp, struct perf_event_attr *attr) +{ + char *pmu_name, *evt_name; + u64 type, config; + + pmu_name = strchr(*strp, ':'); + if (!pmu_name) + return EVT_FAILED; + pmu_name = strndup(*strp, pmu_name - *strp); + type = get_pmu_type(pmu_name); + if ((int)type < 0) + return EVT_FAILED; + attr->type = type; + + evt_name = strchr(*strp, ':') + 1; + config = get_pmu_event_config(pmu_name, evt_name); + *strp += strlen(pmu_name) + 1; /* + 1 for the ':' */ + + if ((int)config < 0) + return parse_raw_config(strp, attr); + + attr->config = config; + *strp += strlen(evt_name); + return EVT_HANDLED; +} + +static enum event_result parse_numeric_event(const char **strp, struct perf_event_attr *attr) { const char *str = *strp; @@ -788,6 +864,10 @@ parse_event_symbols(struct perf_evlist *evlist, const char **str, { enum event_result ret; + ret = parse_sysfs_event(str, attr); + if (ret != EVT_FAILED) + goto modifier; + ret = parse_tracepoint_event(evlist, str, attr); if (ret != EVT_FAILED) goto modifier; -- 1.7.7
-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |