perf data: Add perf_data_file__switch() helper
perf_data_file__switch() closes current output file, renames it, then open a new one to continue recording. It will be used by 'perf record' to split output into multiple perf.data files. Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1460535673-159866-3-git-send-email-wangnan0@huawei.com Signed-off-by: He Kuang <hekuang@huawei.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>hifive-unleashed-5.1
parent
b26dc73018
commit
040f9915e9
|
@ -136,3 +136,44 @@ ssize_t perf_data_file__write(struct perf_data_file *file,
|
||||||
{
|
{
|
||||||
return writen(file->fd, buf, size);
|
return writen(file->fd, buf, size);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
int perf_data_file__switch(struct perf_data_file *file,
|
||||||
|
const char *postfix,
|
||||||
|
size_t pos, bool at_exit)
|
||||||
|
{
|
||||||
|
char *new_filepath;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
if (check_pipe(file))
|
||||||
|
return -EINVAL;
|
||||||
|
if (perf_data_file__is_read(file))
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
if (asprintf(&new_filepath, "%s.%s", file->path, postfix) < 0)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Only fire a warning, don't return error, continue fill
|
||||||
|
* original file.
|
||||||
|
*/
|
||||||
|
if (rename(file->path, new_filepath))
|
||||||
|
pr_warning("Failed to rename %s to %s\n", file->path, new_filepath);
|
||||||
|
|
||||||
|
if (!at_exit) {
|
||||||
|
close(file->fd);
|
||||||
|
ret = perf_data_file__open(file);
|
||||||
|
if (ret < 0)
|
||||||
|
goto out;
|
||||||
|
|
||||||
|
if (lseek(file->fd, pos, SEEK_SET) == (off_t)-1) {
|
||||||
|
ret = -errno;
|
||||||
|
pr_debug("Failed to lseek to %zu: %s",
|
||||||
|
pos, strerror(errno));
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
ret = file->fd;
|
||||||
|
out:
|
||||||
|
free(new_filepath);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
|
@ -46,5 +46,14 @@ int perf_data_file__open(struct perf_data_file *file);
|
||||||
void perf_data_file__close(struct perf_data_file *file);
|
void perf_data_file__close(struct perf_data_file *file);
|
||||||
ssize_t perf_data_file__write(struct perf_data_file *file,
|
ssize_t perf_data_file__write(struct perf_data_file *file,
|
||||||
void *buf, size_t size);
|
void *buf, size_t size);
|
||||||
|
/*
|
||||||
|
* If at_exit is set, only rename current perf.data to
|
||||||
|
* perf.data.<postfix>, continue write on original file.
|
||||||
|
* Set at_exit when flushing the last output.
|
||||||
|
*
|
||||||
|
* Return value is fd of new output.
|
||||||
|
*/
|
||||||
|
int perf_data_file__switch(struct perf_data_file *file,
|
||||||
|
const char *postfix,
|
||||||
|
size_t pos, bool at_exit);
|
||||||
#endif /* __PERF_DATA_H */
|
#endif /* __PERF_DATA_H */
|
||||||
|
|
Loading…
Reference in New Issue