linux-kernel - Re: Implement PEBS virtualization for Silvermont

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Message-ID: <20140530073934.GC20167@laptop.programming.kicks-ass.net>
Date:	Fri, 30 May 2014 09:39:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	gleb@...nel.org, pbonzini@...hat.com, eranian@...gle.com,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Implement PEBS virtualization for Silvermont

On Thu, May 29, 2014 at 06:12:03PM -0700, Andi Kleen wrote:
> PEBS is very useful (e.g. enabling the more cycles:pp event or
> memory profiling) Unfortunately it didn't work in virtualization,
> which is becoming more and more common.
> 
> This patch kit implements simple PEBS virtualization for KVM on Silvermont
> CPUs. Silvermont does not have the leak problems that prevented successfull
> PEBS virtualization earlier.

Silvermont is such an underpowered thing, who in his right mind would
run anything virt on it to further reduce performance?
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