linux-kernel - Re: [PATCH] x86,switch_mm: skip atomic operations for init

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Date:   Sat, 02 Jun 2018 05:39:36 +0200
From:   Mike Galbraith <efault@....de>
To:     Andy Lutomirski <luto@...nel.org>, riel@...riel.com
Cc:     LKML <linux-kernel@...r.kernel.org>, songliubraving@...com,
        kernel-team <kernel-team@...com>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, X86 ML <x86@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] x86,switch_mm: skip atomic operations for init_mm

On Fri, 2018-06-01 at 13:03 -0700, Andy Lutomirski wrote:
> 
> Mike, you never did say: do you have PCID on your CPU?

Yes.

>   Also, what is
> your workload doing to cause so many switches back and forth between
> init_mm and a task.

pipe-test measures pipe round trip, does nearly nothing but schedule.  

	-Mike