PD#SWPL-72350
Problem:
add a tool to list how many memory cache files used in file
cache.
console:/ # cat /proc/filecache
Solution:
porting file cache from 5.4.
Verify:
local.
Signed-off-by: Jianxiong Pan <jianxiong.pan@amlogic.com>
Change-Id: I92420acab7333b75bbb5bca1075d3e401b027fb2