linux-kernel - Re: [PATCH] perf, x86: Enable PEBS mode automatically for mem-{loads,stores} v3

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Message-ID: <20130723083834.GS27075@twins.programming.kicks-ass.net>
Date:	Tue, 23 Jul 2013 10:38:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>, eranian@...gle.com
Subject: Re: [PATCH] perf, x86: Enable PEBS mode automatically for
 mem-{loads,stores} v3

On Thu, Jul 18, 2013 at 04:03:39PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> [The patch to enable this in the user tools has been sent separately]
> 
> With the earlier patches to automatically try cpu// and add
> a precise sys attribute, we can now enable PEBS for the mem-loads,
> mem-stores events everywhere.
> 
> This allows to use
> 
> perf record -e mem-loads ...
> 
> instead of
> 
> perf record -e cpu/mem-loads/p ...
> 
> Always use precise=2 even though it is costly pre-Haswell

This Changelog fails to give a reason _why_ we'd want to do this.
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