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perf thrad_map: Add comm string into array

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Adding support to hold comm name together with pids in 'struct
thread_map'. It will be useful for --per-thread option to display task
pid together with task name.

Adding thread_map__read_comms function that reads/set
comm string for the 'struct thread_map'.

Getting the task name from /proc/$pid/comm.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.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/1435310967-14570-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2015-06-26 11:29:07 +02:00 committed by Arnaldo Carvalho de Melo
parent 62eea46438
commit 792402fd5c
3 changed files with 68 additions and 0 deletions
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1
tools/perf/util/python-ext-sources
View File

@ -20,3 +20,4 @@ util/stat.c
util/strlist.c
util/trace-event.c
../../lib/rbtree.c
util/string.c

59
tools/perf/util/thread_map.c
View File

@ -8,9 +8,11 @@
#include <unistd.h>
#include "strlist.h"
#include <string.h>
#include <api/fs/fs.h>
#include "asm/bug.h"
#include "thread_map.h"
#include "util.h"
#include "debug.h"
/* Skip "." and ".." directories */
static int filter(const struct dirent *dir)
@ -319,8 +321,12 @@ struct thread_map *thread_map__new_str(const char *pid, const char *tid,
static void thread_map__delete(struct thread_map *threads)
{
if (threads) {
int i;
WARN_ONCE(atomic_read(&threads->refcnt) != 0,
"thread map refcnt unbalanced\n");
for (i = 0; i < threads->nr; i++)
free(thread_map__comm(threads, i));
free(threads);
}
}
@ -348,3 +354,56 @@ size_t thread_map__fprintf(struct thread_map *threads, FILE *fp)
return printed + fprintf(fp, "\n");
}
static int get_comm(char **comm, pid_t pid)
{
char *path;
size_t size;
int err;
if (asprintf(&path, "%s/%d/comm", procfs__mountpoint(), pid) == -1)
return -ENOMEM;
err = filename__read_str(path, comm, &size);
if (!err) {
/*
* We're reading 16 bytes, while filename__read_str
* allocates data per BUFSIZ bytes, so we can safely
* mark the end of the string.
*/
(*comm)[size] = 0;
rtrim(*comm);
}
free(path);
return err;
}
static void comm_init(struct thread_map *map, int i)
{
pid_t pid = thread_map__pid(map, i);
char *comm = NULL;
/* dummy pid comm initialization */
if (pid == -1) {
map->map[i].comm = strdup("dummy");
return;
}
/*
* The comm name is like extra bonus ;-),
* so just warn if we fail for any reason.
*/
if (get_comm(&comm, pid))
pr_warning("Couldn't resolve comm name for pid %d\n", pid);
map->map[i].comm = comm;
}
void thread_map__read_comms(struct thread_map *threads)
{
int i;
for (i = 0; i < threads->nr; ++i)
comm_init(threads, i);
}

8
tools/perf/util/thread_map.h
View File

@ -7,6 +7,7 @@
struct thread_map_data {
pid_t pid;
char *comm;
};
struct thread_map {
@ -44,4 +45,11 @@ thread_map__set_pid(struct thread_map *map, int thread, pid_t pid)
{
map->map[thread].pid = pid;
}
static inline char *thread_map__comm(struct thread_map *map, int thread)
{
return map->map[thread].comm;
}
void thread_map__read_comms(struct thread_map *threads);
#endif /* __PERF_THREAD_MAP_H */