linux/tools/perf/util/thread.c
Frederic Weisbecker 3178f58b98 perf tools: Do proper comm override error handling
The comm overriding API ignores memory allocation failures by silently
keeping the previous and out of date comm.

As a result, the user may get buggy events without ever being notified
about the problem and its source.

Lets start to fix this by propagating the error from the API. Not all
callers may be doing proper error handling on comm set yet but this is
the first step toward it.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1389713836-13375-2-git-send-email-fweisbec@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-01-16 16:44:39 -03:00

145 lines
2.9 KiB
C

#include "../perf.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "session.h"
#include "thread.h"
#include "util.h"
#include "debug.h"
#include "comm.h"
struct thread *thread__new(pid_t pid, pid_t tid)
{
char *comm_str;
struct comm *comm;
struct thread *thread = zalloc(sizeof(*thread));
if (thread != NULL) {
map_groups__init(&thread->mg);
thread->pid_ = pid;
thread->tid = tid;
thread->ppid = -1;
INIT_LIST_HEAD(&thread->comm_list);
comm_str = malloc(32);
if (!comm_str)
goto err_thread;
snprintf(comm_str, 32, ":%d", tid);
comm = comm__new(comm_str, 0);
free(comm_str);
if (!comm)
goto err_thread;
list_add(&comm->list, &thread->comm_list);
}
return thread;
err_thread:
free(thread);
return NULL;
}
void thread__delete(struct thread *thread)
{
struct comm *comm, *tmp;
map_groups__exit(&thread->mg);
list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
list_del(&comm->list);
comm__free(comm);
}
free(thread);
}
struct comm *thread__comm(const struct thread *thread)
{
if (list_empty(&thread->comm_list))
return NULL;
return list_first_entry(&thread->comm_list, struct comm, list);
}
/* CHECKME: time should always be 0 if event aren't ordered */
int thread__set_comm(struct thread *thread, const char *str, u64 timestamp)
{
struct comm *new, *curr = thread__comm(thread);
int err;
/* Override latest entry if it had no specific time coverage */
if (!curr->start) {
err = comm__override(curr, str, timestamp);
if (err)
return err;
} else {
new = comm__new(str, timestamp);
if (!new)
return -ENOMEM;
list_add(&new->list, &thread->comm_list);
}
thread->comm_set = true;
return 0;
}
const char *thread__comm_str(const struct thread *thread)
{
const struct comm *comm = thread__comm(thread);
if (!comm)
return NULL;
return comm__str(comm);
}
/* CHECKME: it should probably better return the max comm len from its comm list */
int thread__comm_len(struct thread *thread)
{
if (!thread->comm_len) {
const char *comm = thread__comm_str(thread);
if (!comm)
return 0;
thread->comm_len = strlen(comm);
}
return thread->comm_len;
}
size_t thread__fprintf(struct thread *thread, FILE *fp)
{
return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
map_groups__fprintf(&thread->mg, verbose, fp);
}
void thread__insert_map(struct thread *thread, struct map *map)
{
map_groups__fixup_overlappings(&thread->mg, map, verbose, stderr);
map_groups__insert(&thread->mg, map);
}
int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
{
int i, err;
if (parent->comm_set) {
const char *comm = thread__comm_str(parent);
if (!comm)
return -ENOMEM;
err = thread__set_comm(thread, comm, timestamp);
if (err)
return err;
thread->comm_set = true;
}
for (i = 0; i < MAP__NR_TYPES; ++i)
if (map_groups__clone(&thread->mg, &parent->mg, i) < 0)
return -ENOMEM;
thread->ppid = parent->tid;
return 0;
}