Re: [RFC PATCH 1/2] x86/ibpb: Skip IBPB when we switch back to same user process
From: Andi Kleen
Date: Thu Jan 25 2018 - 16:58:03 EST
Andy Lutomirski <luto@xxxxxxxxxx> writes:
>
> That being said, just stashing last_user_mm without any refcounting
> should be fine.
If last_user_mm is freed and reallocated by a different process,
then that would miss the IPBP incorrectly.
-Andi