Added F2FS_IOSTAT config option to support getting IO statistics through
sysfs and printing out periodic IO statistics tracepoint events and
moved I/O statistics related codes into separate files for better
maintenance.
Signed-off-by: NDaeho Jeong <daehojeong@google.com>
Reviewed-by: NChao Yu <chao@kernel.org>
[Jaegeuk Kim: set default=y]
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>