linux-kernel - Re: [PATCH] tracing/filters: add run-time field descriptions to TRACE_EVENT

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Message-ID: <20090402015830.GB12489@elte.hu>
Date:	Thu, 2 Apr 2009 03:58:30 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Tom Zanussi <tzanussi@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing/filters: add run-time field descriptions to
	TRACE_EVENT_FORMAT events


* Steven Rostedt <rostedt@...dmis.org> wrote:

> Now what I could do, is to add a cmpxchg. If there's no data after 
> the data that we want to discard, then we discard it. Note, this 
> can only happen before the commit is made.
> 
> I'll see if I can implement that.

Great!

I dont think the IRQ race is a common one even with a lot of IRQs, 
so as long as the common case is fine and we let a few holes slip 
through it should be fine.

[ If the IRQ race window is wide then that's a sign of us having too 
  much tracing overhead ;-) ]

	Ingo
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