linux-kernel - Re: [PATCH V5 4/6] perf, x86: handle multiple records in PEBS buffer

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Message-ID: <20150330215327.GJ2366@two.firstfloor.org>
Date:	Mon, 30 Mar 2015 23:53:27 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Liang, Kan" <kan.liang@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"acme@...radead.org" <acme@...radead.org>,
	"eranian@...gle.com" <eranian@...gle.com>
Subject: Re: [PATCH V5 4/6] perf, x86: handle multiple records in PEBS buffer

> I just said I want a
> coherent story about what and why we're doing this.

What:
is clear, isn't it? Use this capability which has been long designed
into PEBS, but not used by perf.

Why:
The goal is to go to higher sampling rates with comparable or less overhead.
Higher sampling rates improve analysis of anything that is not
mostly doing the same thing over and over.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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