linux-kernel - Re: [RFC PATCH 1/3] Unified trace buffer

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Message-ID: <alpine.LFD.1.10.0809251631460.3265@nehalem.linux-foundation.org>
Date:	Thu, 25 Sep 2008 16:33:48 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Steven Rostedt <rostedt@...dmis.org>,
	Martin Bligh <mbligh@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Martin Bligh <mbligh@...igh.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	prasad@...ux.vnet.ibm.com,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	David Wilder <dwilder@...ibm.com>, hch@....de,
	Tom Zanussi <zanussi@...cast.net>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [RFC PATCH 1/3] Unified trace buffer



On Fri, 26 Sep 2008, Ingo Molnar wrote:
> 
> i do not understand this argument of yours. (really)
> 
> 1) is your point that we might lock up?

Have you at all followed the discussion about the people who asked for 
cross-CPU ordering? They wanted not timestamps at all, but global atomic 
counter updates. Which is very reasonable, if timestamps don't work (and 
jiffies certainly doesn't, especially in a NOHZ environment).

IOW, my whole argument is that what tracers want is _not_ the same thing 
as what "sched_clock()" wants.

		Linus
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