Using tried_regions/total_bytes file, users can efficiently retrieve the
total size of memory regions having specific access pattern.  However,
DAMON sysfs interface in kernel still populates all the infomration on the
tried_regions subdirectories.  That means the kernel part overhead for the
construction of tried regions directories still exists.  To remove the
overhead, implement yet another command input for 'state' DAMON sysfs
file.  Writing the input to the file makes DAMON sysfs interface to update
only the total_bytes file.

Link: https://lkml.kernel.org/r/20230802213222.109841-3-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>