linux-kernel - Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support

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Message-ID: <20140409174024.GB22728@two.firstfloor.org>
Date:	Wed, 9 Apr 2014 19:40:24 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...capital.net>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support


BTW the whole discussion is rather pointless.

We have to profile the software as it is, not as we wish it to be.

That means: small functions, often no frame pointer, all kinds of crappy
code and missing information.

And then doing it all with as little overhead as possible.

I think on these metrics callstack LBR is attractive for many
(but not all) cases.

-Andi

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