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

From	Linus Torvalds <torvalds@linux-foundation.org>
Newsgroups	linux.kernel
Subject	Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression
Date	2015-09-08 19:50 +0200
Message-ID	<q6vbQ-2PL-25@gated-at.bofh.it> (permalink)
References	(6 earlier) <q516c-61Z-29@gated-at.bofh.it> <q5Sat-5Rx-7@gated-at.bofh.it> <q5Yzg-6qO-1@gated-at.bofh.it> <q6bwt-863-15@gated-at.bofh.it> <q6o0H-15W-71@gated-at.bofh.it>
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On Tue, Sep 8, 2015 at 3:05 AM, Peter Zijlstra <peterz@infradead.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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Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-07 22:50 +0200
  Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Davidlohr Bueso <dave@stgolabs.net> - 2015-09-08 08:40 +0200
  Re: [4.2, Regression] Queued spinlocks cause major XFS performance  regression Peter Zijlstra <peterz@infradead.org> - 2015-09-08 12:10 +0200
    Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-08 19:50 +0200

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