linux-kernel - Re: [PATCH 2/5][RFC] tracing: move function profiler data out of function struct

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Message-ID: <20090325183513.GE28366@elte.hu>
Date:	Wed, 25 Mar 2009 19:35:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tim Bird <tim.bird@...sony.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 2/5][RFC] tracing: move function profiler data out of
	function struct


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

> struct ftrace_profile {
> 	struct hlist_node	*node;
> 	unsigned long		ip;
> 	unsigned long		hit;
> 	unsigned long long	calltime;
> };
> 
> on x86_64 that is 40 bytes. (node is 16, ip is 8, hit is 8, calltime is 8)

node is a pointer so it's 8 bytes - so the whole thing is 32 bytes. 
Acceptable IMO - and could be compressed further if needed.

	Ingo
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