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

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Date:   Mon, 25 Jan 2021 19:27:14 +0000
From:   Fenghua Yu <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>,
        Tony Luck <tony.luck@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        Ravi V Shankar <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 X86 Maintainers,

>On Mon, Jan 04, 2021 at 07:42:28PM +0000, Fenghua Yu wrote:
> 
> On Tue, Nov 24, 2020 at 08:52:41PM +0000, Fenghua Yu wrote:
> > 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.
 
Just a friendly reminder. Any comment on this series? There hasn't been
any comment since it was posted.

This series can be applied cleanly to v5.11-rc5 and pass all of our
tests. If you want me to repost this series, I can do that too.

Thanks!

-Fenghua