linux-kernel - Re: [PATCH 3/3] tracing/function-return-tracer: add the overrun field

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Message-ID: <alpine.DEB.1.10.0811180922370.15003@gandalf.stny.rr.com>
Date:	Tue, 18 Nov 2008 09:23:25 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] tracing/function-return-tracer: add the overrun
 field


On Tue, 18 Nov 2008, Ingo Molnar wrote:
> > 
> > Ok I will try with 50. If there are still a lot and often missing 
> > traces with this depth, perhaps should we consider a hybrid solution 
> > between ret stack and trampolines? We could use the normal ret stack 
> > on struct info for most common cases and the trampoline when we are 
> > exceeding the depth....
> 
> dunno, trampolines make me feel uneasy.
> 
> Could you set it to some really large value (200) and add a "max depth 
> seen" variable perhaps, and see the maximum depth?

Don't run that on a box you care about ;-)  But hopefully the stacks will 
not collide. This should also depend on IRQSTACKS.

-- Steve

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