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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>
This commit is contained in:
Wang Nan 2016-04-13 08:21:05 +00:00 committed by Arnaldo Carvalho de Melo
parent b26dc73018
commit 040f9915e9
2 changed files with 51 additions and 1 deletions
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41
tools/perf/util/data.c
View File

@ -136,3 +136,44 @@ ssize_t perf_data_file__write(struct perf_data_file *file,
{
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;
}

11
tools/perf/util/data.h
View File

@ -46,5 +46,14 @@ int perf_data_file__open(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,
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 */