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

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Message-ID: <20150904155448.GS18673@twins.programming.kicks-ass.net>
Date:	Fri, 4 Sep 2015 17:54:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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 Fri, Sep 04, 2015 at 05:30:35PM +0200, Peter Zijlstra wrote:
> Should I place the virt_spin_lock() thing under CONFIG_PARAVIRT (maybe
> even _SPINLOCKS) such that only paravirt enabled kernels when ran on a
> hypervisor that does not support paravirt patching (HyperV, VMware,
> etc..) revert to the test-and-set?

Ah, CONFIG_HYPERVISOR_GUEST seems fitting, that's a prerequisite for all
the PARAVIRT options too.

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