linux-kernel - Re: [PATCH 0/2] x86/entry: Trade cycles

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Date:   Tue, 21 Nov 2023 16:26:24 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: Re: [PATCH 0/2] x86/entry: Trade cycles

On Mon, Nov 20 2023 at 15:33, Peter Zijlstra wrote:
> Two little patches that trade a little performance. First patch optimizes
> (although I couldn't get definite numbers showing it makes a difference) the
> return to user path by avoiding some PTI specifics in the generic path.
>
> Second patch then steals some of the won cycles by making a debug check
> unconditional.
>
> This came forth from a discussion with amluto who lamented we only had the
> debug check conditional on DEBUG_ENTRY.

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>