forked from luck/tmp_suning_uos_patched
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>
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25a7d91427
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@ -101,6 +101,19 @@ void put_events_file(char *file)
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free(file);
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}
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DIR *tracing_events__opendir(void)
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{
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DIR *dir = NULL;
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char *path = get_tracing_file("events");
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if (path) {
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dir = opendir(path);
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put_events_file(path);
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}
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return dir;
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}
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int tracing_path__strerror_open_tp(int err, char *buf, size_t size,
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const char *sys, const char *name)
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{
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@ -3,9 +3,12 @@
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#define __API_FS_TRACING_PATH_H
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#include <linux/types.h>
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#include <dirent.h>
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extern char tracing_events_path[];
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DIR *tracing_events__opendir(void);
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void tracing_path_set(const char *mountpoint);
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const char *tracing_path_mount(void);
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@ -1323,7 +1323,7 @@ static int count_tracepoints(void)
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DIR *events_dir;
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int cnt = 0;
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events_dir = opendir(tracing_events_path);
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events_dir = tracing_events__opendir();
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TEST_ASSERT_VAL("Can't open events dir", events_dir);
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@ -191,7 +191,7 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
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char evt_path[MAXPATHLEN];
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char *dir_path;
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sys_dir = opendir(tracing_events_path);
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sys_dir = tracing_events__opendir();
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if (!sys_dir)
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return NULL;
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@ -578,7 +578,7 @@ static int add_tracepoint_multi_sys(struct list_head *list, int *idx,
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DIR *events_dir;
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int ret = 0;
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events_dir = opendir(tracing_events_path);
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events_dir = tracing_events__opendir();
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if (!events_dir) {
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tracepoint_error(err, errno, sys_name, evt_name);
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return -1;
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@ -2106,7 +2106,7 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
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bool evt_num_known = false;
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restart:
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sys_dir = opendir(tracing_events_path);
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sys_dir = tracing_events__opendir();
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if (!sys_dir)
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return;
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@ -2200,7 +2200,7 @@ int is_valid_tracepoint(const char *event_string)
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char evt_path[MAXPATHLEN];
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char *dir_path;
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sys_dir = opendir(tracing_events_path);
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sys_dir = tracing_events__opendir();
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if (!sys_dir)
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return 0;
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