Just upgraded to MIUI 9 then you must be missing the feature where you launch the ‘Recent Apps’ and clear the cache and you see the amount of free RAM. If you are missing this feature then you will be happy to know that there is an easy way to bring this feature back. Just follow the DIY guide below.
1. Open Settings on your Redmi phone
2. Click Home Screen and Recents Option from Settings Options
3. Enable the option ” Show Memory Status” in the bottom menu
After enabling this option you must be able to see the status of remaining and in use ram again.