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authorJiri Olsa <jolsa@kernel.org>2016-02-24 09:46:42 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-02-24 10:10:59 -0300
commit54fbad54ebcde9db9c7459e9e379f2350c25e1f1 (patch)
treedc1ea35ca55cd0dfd2220aa0e061cc5ee1731304 /tools
parentc2b8d8c55c0235e21c563283f634bcfd2ba7bc1e (diff)
downloadlinux-54fbad54ebcde9db9c7459e9e379f2350c25e1f1.tar.gz
perf mem record: Check for memory events support
Check if current kernel support available memory events and display the status within -e list option: $ perf mem record -e list ldlat-loads : available ldlat-stores : available Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1456303616-26926-2-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-mem.c20
-rw-r--r--tools/perf/util/mem-events.c35
-rw-r--r--tools/perf/util/mem-events.h3
3 files changed, 51 insertions, 7 deletions
diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index b3f8a89ede40..f1fa7b8d1f69 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -40,10 +40,11 @@ static int parse_record_events(const struct option *opt,
for (j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
struct perf_mem_event *e = &perf_mem_events[j];
- fprintf(stderr, "%-20s%s",
- e->tag, verbose ? "" : "\n");
- if (verbose)
- fprintf(stderr, " [%s]\n", e->name);
+ fprintf(stderr, "%-13s%-*s%s\n",
+ e->tag,
+ verbose ? 25 : 0,
+ verbose ? e->name : "",
+ e->supported ? ": available" : "");
}
exit(0);
}
@@ -92,6 +93,12 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
if (!perf_mem_events[j].record)
continue;
+ if (!perf_mem_events[j].supported) {
+ pr_err("failed: event '%s' not supported\n",
+ perf_mem_events[j].name);
+ return -1;
+ }
+
rec_argv[i++] = "-e";
rec_argv[i++] = perf_mem_events[j].name;
};
@@ -355,6 +362,11 @@ int cmd_mem(int argc, const char **argv, const char *prefix __maybe_unused)
NULL
};
+ if (perf_mem_events__init()) {
+ pr_err("failed: memory events not supported\n");
+ return -1;
+ }
+
argc = parse_options_subcommand(argc, argv, mem_options, mem_subcommands,
mem_usage, PARSE_OPT_STOP_AT_NON_OPTION);
diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index b1507c04b257..e21853fe1312 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -2,15 +2,20 @@
#include <stdlib.h>
#include <string.h>
#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <api/fs/fs.h>
#include "mem-events.h"
#include "debug.h"
-#define E(t, n) { .tag = t, .name = n }
+#define E(t, n, s) { .tag = t, .name = n, .sysfs_name = s }
struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX] = {
- E("ldlat-loads", "cpu/mem-loads,ldlat=30/P"),
- E("ldlat-stores", "cpu/mem-stores/P"),
+ E("ldlat-loads", "cpu/mem-loads,ldlat=30/P", "mem-loads"),
+ E("ldlat-stores", "cpu/mem-stores/P", "mem-stores"),
};
+#undef E
#undef E
@@ -49,3 +54,27 @@ int perf_mem_events__parse(const char *str)
pr_err("failed: event '%s' not found, use '-e list' to get list of available events\n", str);
return -1;
}
+
+int perf_mem_events__init(void)
+{
+ const char *mnt = sysfs__mount();
+ bool found = false;
+ int j;
+
+ if (!mnt)
+ return -ENOENT;
+
+ for (j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
+ char path[PATH_MAX];
+ struct perf_mem_event *e = &perf_mem_events[j];
+ struct stat st;
+
+ scnprintf(path, PATH_MAX, "%s/devices/cpu/events/%s",
+ mnt, e->sysfs_name);
+
+ if (!stat(path, &st))
+ e->supported = found = true;
+ }
+
+ return found ? 0 : -ENOENT;
+}
diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
index 2995bae6ac33..75c1660bda62 100644
--- a/tools/perf/util/mem-events.h
+++ b/tools/perf/util/mem-events.h
@@ -5,8 +5,10 @@
struct perf_mem_event {
bool record;
+ bool supported;
const char *tag;
const char *name;
+ const char *sysfs_name;
};
enum {
@@ -18,5 +20,6 @@ enum {
extern struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX];
int perf_mem_events__parse(const char *str);
+int perf_mem_events__init(void);
#endif /* __PERF_MEM_EVENTS_H */