linux-kernel - Re: [PATCH v2] perf/x86/intel: Add support for MISPREDICT bit on Knights Landing cpus

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Message-ID: <20180730164839.GP2494@hirez.programming.kicks-ass.net>
Date:   Mon, 30 Jul 2018 18:48:40 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jacek Tomaka <jacekt@....com>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jacek Tomaka <jacek.tomaka@...zta.fm>
Subject: Re: [PATCH v2] perf/x86/intel: Add support for MISPREDICT bit on
 Knights Landing cpus


A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?On Tue, Jul 31, 2018 at 12:34:02AM +0800, Jacek Tomaka wrote:

> Ah, right:
> /*
>  * Due to lack of segmentation in Linux the effective address (offset)
>  * is the same as the linear address, allowing us to merge the LIP and EIP
>  * LBR formats.
>  */
>
> Yeah, LBR_FORMAT_EIP_FLAGS is ok as well. Would it be preffered?

Yeah, think so, that keeps the lookup table const.