linux-kernel - Re: Warning from ring buffer code (Was: Re: linux-next: tip tree build warning)

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Message-Id: <1252952621.31964.0.camel@twins>
Date:	Mon, 14 Sep 2009 20:23:41 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <srostedt@...hat.com>
Cc:	Christopher Li <sparse@...isli.org>,
	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-sparse@...r.kernel.org,
	Josh Triplett <josh@...edesktop.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: Warning from ring buffer code (Was: Re: linux-next: tip tree 
 build warning)

On Mon, 2009-09-14 at 14:17 -0400, Steven Rostedt wrote:
> Frederic, how big can one of those events get. The ring buffer (and
> TRACE_EVENT) allow up to almost a page size, which is very hefty for the
> stack. This code needs to either be rewritten or we need to set a limit
> to the size of a profile entry.

Yeah, that needs to get a re-write.. I've complained about this when it
went in.
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