perf tools: Reconstruct event with modifiers from perf_event_attr
The modifiers:
k kernel space
u user space
h hypervisor
G guest
H host
p, pp, ppp precision level (PEBS)
that can be suffixed to an event were lost when tools used event_name()
to reconstruct them from the perf_event_attr entries in a perf.data
file.
Fix it by following the defaults used for these modifiers in the current
codebase, so:
$ perf record -e instructions:u usleep 1 2> /dev/null
$ perf evlist
instructions:u
$ perf record -e cycles:k usleep 1 2> /dev/null
$ perf evlist
cycles:k
$ perf record -e cycles:kh usleep 1 2> /dev/null
$ perf evlist
cycles:kh
$ perf record -e cache-misses:G usleep 1 2> /dev/null
$ perf evlist
cache-misses:G
$ perf record -e cycles:ppk usleep 1 2> /dev/null
$ perf evlist
cycles:kpp
$
Also works with 'top', 'report', etc.
More work needed to cover tracepoints and software events while not
dragging lots of baggage to the python binding, this is a minimal fix
for v3.5.
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-4hl5glle0hxlklw4usva1mkt@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 57e4ce5..91d1913 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -15,6 +15,7 @@
#include "cpumap.h"
#include "thread_map.h"
#include "target.h"
+#include "../../include/linux/perf_event.h"
#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
#define GROUP_FD(group_fd, cpu) (*(int *)xyarray__entry(group_fd, cpu, 0))
@@ -64,6 +65,95 @@
return evsel;
}
+static const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
+ "cycles",
+ "instructions",
+ "cache-references",
+ "cache-misses",
+ "branches",
+ "branch-misses",
+ "bus-cycles",
+ "stalled-cycles-frontend",
+ "stalled-cycles-backend",
+ "ref-cycles",
+};
+
+const char *__perf_evsel__hw_name(u64 config)
+{
+ if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
+ return perf_evsel__hw_names[config];
+
+ return "unknown-hardware";
+}
+
+static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
+{
+ int colon = 0;
+ struct perf_event_attr *attr = &evsel->attr;
+ int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(attr->config));
+ bool exclude_guest_default = false;
+
+#define MOD_PRINT(context, mod) do { \
+ if (!attr->exclude_##context) { \
+ if (!colon) colon = r++; \
+ r += scnprintf(bf + r, size - r, "%c", mod); \
+ } } while(0)
+
+ if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
+ MOD_PRINT(kernel, 'k');
+ MOD_PRINT(user, 'u');
+ MOD_PRINT(hv, 'h');
+ exclude_guest_default = true;
+ }
+
+ if (attr->precise_ip) {
+ if (!colon)
+ colon = r++;
+ r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
+ exclude_guest_default = true;
+ }
+
+ if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
+ MOD_PRINT(host, 'H');
+ MOD_PRINT(guest, 'G');
+ }
+#undef MOD_PRINT
+ if (colon)
+ bf[colon] = ':';
+ return r;
+}
+
+int perf_evsel__name(struct perf_evsel *evsel, char *bf, size_t size)
+{
+ int ret;
+
+ switch (evsel->attr.type) {
+ case PERF_TYPE_RAW:
+ ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
+ break;
+
+ case PERF_TYPE_HARDWARE:
+ ret = perf_evsel__hw_name(evsel, bf, size);
+ break;
+ default:
+ /*
+ * FIXME
+ *
+ * This is the minimal perf_evsel__name so that we can
+ * reconstruct event names taking into account event modifiers.
+ *
+ * The old event_name uses it now for raw anr hw events, so that
+ * we don't drag all the parsing stuff into the python binding.
+ *
+ * On the next devel cycle the rest of the event naming will be
+ * brought here.
+ */
+ return 0;
+ }
+
+ return ret;
+}
+
void perf_evsel__config(struct perf_evsel *evsel, struct perf_record_opts *opts,
struct perf_evsel *first)
{