linux-kernel - Re: [RFC 00/17] Pile o' entry stack changes

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Message-ID: <87vakvpj5b.fsf@firstfloor.org>
Date:   Wed, 06 Sep 2017 15:16:48 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [RFC 00/17] Pile o' entry stack changes

Andy Lutomirski <luto@...nel.org> writes:
>
>  - Lots of people (Linus included) have asked to convert the entry
>    code to pop registers on exit instead of movqing them off the
>    stack.  This makes a bunch of progress in that direction.

You should benchmark it on Atoms. Likely it's a regression there
because they don't have the special PUSH/POP acceleration.

-Andi