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tools lib api fs tracing_path: Introduce opendir() method

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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-05-17 14:42:39 -03:00
parent 25a7d91427
commit 7014e0e3bf
4 changed files with 21 additions and 5 deletions
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13
tools/lib/api/fs/tracing_path.c
View file

@ -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)
{