linux-kernel - RE: [PATCH v4 0/4] x86/bus_lock: Enable bus lock detection

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Date:   Wed, 2 Dec 2020 20:36:11 +0000
From:   "Yu, Fenghua" <fenghua.yu@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Luck, Tony" <tony.luck@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Li, Xiaoyao" <xiaoyao.li@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>
CC:     linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: RE: [PATCH v4 0/4] x86/bus_lock: Enable bus lock detection

Hi, Dear maintainers,

> A bus lock [1] is acquired through either split locked access to writeback (WB)
> memory or any locked access to non-WB memory. This is typically >1000
> cycles slower than an atomic operation within a cache line. It also disrupts
> performance on other cores.

...

> Change Log:
> v4:
> - Fix a ratelimit wording issue in the doc (Randy).
> - Patch 4 is acked by Randy (Randy).

Friendly reminder about this series...

Thank you very much in advance for your time!

-Fenghua