Commit 040f9915 authored by Wang Nan's avatar Wang Nan Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarWang 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: default avatarHe Kuang <hekuang@huawei.com>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent b26dc730

tools/perf/util/data.c

+41 −0
Original line number Diff line number Diff line
@@ -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;

}

tools/perf/util/data.h

+10 −1
Original line number Diff line number Diff line
@@ -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 */

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