linux-kernel - Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression

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Message-ID: <CA+55aFxqRarc2qCTmOk_tQbnmOzdp7Lpwkm5EJ5kxpxD66Y9+A@mail.gmail.com>
Date:	Tue, 8 Sep 2015 10:45:06 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Davidlohr Bueso <dave@...olabs.net>,
	Dave Chinner <david@...morbit.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Waiman Long <Waiman.Long@...com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression

On Tue, Sep 8, 2015 at 3:05 AM, Peter Zijlstra <peterz@...radead.org> wrote:
>
> Ah, so I think the confusion is in what we consider paravirt to mean. My
> definition of paravirt is that its a form of virtualization where the
> guest and host communicate over a software channel.

Like an architected bit in cpuid that the host sets if it wants the
guest to change its behavior?

             Linus
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