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authorArnaldo Carvalho de Melo <acme@redhat.com>2018-05-17 14:42:39 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-05-17 14:50:38 -0300
commit7014e0e3bf9b0d0b6221eb7d2f8a1f690423dd73 (patch)
tree37da2c3997d4b2c03a4e1698481e8608925b11cd /tools/lib
parent25a7d914274de38637c5199342eb90a297361386 (diff)
downloadlinux-7014e0e3bf9b0d0b6221eb7d2f8a1f690423dd73.tar.bz2
tools lib api fs tracing_path: Introduce opendir() method
That takes care of using the right call to get the tracing_path directory, the one that will end up calling tracing_path_set() to figure out where tracefs is mounted. One more step in doing just lazy reading of system structures to reduce the number of operations done unconditionaly at 'perf' start. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-42zzi0f274909bg9mxzl81bu@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/api/fs/tracing_path.c13
-rw-r--r--tools/lib/api/fs/tracing_path.h3
2 files changed, 16 insertions, 0 deletions
diff --git a/tools/lib/api/fs/tracing_path.c b/tools/lib/api/fs/tracing_path.c
index 9cd282425929..9b451af0721c 100644
--- a/tools/lib/api/fs/tracing_path.c
+++ b/tools/lib/api/fs/tracing_path.c
@@ -101,6 +101,19 @@ void put_events_file(char *file)
free(file);
}
+DIR *tracing_events__opendir(void)
+{
+ DIR *dir = NULL;
+ char *path = get_tracing_file("events");
+
+ if (path) {
+ dir = opendir(path);
+ put_events_file(path);
+ }
+
+ return dir;
+}
+
int tracing_path__strerror_open_tp(int err, char *buf, size_t size,
const char *sys, const char *name)
{
diff --git a/tools/lib/api/fs/tracing_path.h b/tools/lib/api/fs/tracing_path.h
index 3b32fb439f12..904d085b2ae7 100644
--- a/tools/lib/api/fs/tracing_path.h
+++ b/tools/lib/api/fs/tracing_path.h
@@ -3,9 +3,12 @@
#define __API_FS_TRACING_PATH_H
#include <linux/types.h>
+#include <dirent.h>
extern char tracing_events_path[];
+DIR *tracing_events__opendir(void);
+
void tracing_path_set(const char *mountpoint);
const char *tracing_path_mount(void);