linux-kernel - Re: [PATCH] perf: implement recording/reporting per-cpu samples

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Message-ID: <1272919356.1642.154.camel@laptop>
Date:	Mon, 03 May 2010 22:42:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arun Sharma <aruns@...gle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, fweisbec@...il.com
Subject: Re: [PATCH] perf: implement recording/reporting per-cpu samples

On Mon, 2010-05-03 at 13:38 -0700, Arun Sharma wrote:
> Enable PERF_SAMPLE_CPU by default. Implement --sort cpu.

Why? The downside is that you unconditionally grow each sample and thus
increase the overhead for something that doesn't make sense for the
normal (task-inherit) case.



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