linux-kernel - Re: Proper kernel irq time accounting -v3

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Message-ID: <8762xnwtjn.fsf@basil.nowhere.org>
Date:	Thu, 30 Sep 2010 09:59:40 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Venkatesh Pallipadi <venki@...gle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Paul Turner <pjt@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: Proper kernel irq time accounting -v3

Venkatesh Pallipadi <venki@...gle.com> writes:
>
> Solution to (1) involves adding extra timing on irq entry/exit to
> get the fine granularity info and then exporting it to user.

This means RDTSC right?

I am a bit concerned about overhead on systems with high TSC overhead.
Is there a way to turn this off at runtime for those?

-Andi

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