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Date: Wed, 25 Mar 2009 19:35:13 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       Tim Bird <tim.bird@am.sony.com>, Steven Rostedt <srostedt@redhat.com>
Subject: Re: [PATCH 2/5][RFC] tracing: move function profiler data out of
	function struct
Message-ID: <20090325183513.GE28366@elte.hu>
References: <20090325035646.662994901@goodmis.org> <20090325040832.443420395@goodmis.org> <20090325100746.GI2341@elte.hu> <alpine.DEB.2.00.0903251142470.5675@gandalf.stny.rr.com> <20090325174446.GE14250@elte.hu> <alpine.DEB.2.00.0903251354020.5675@gandalf.stny.rr.com> <20090325180203.GB25518@elte.hu> <alpine.DEB.2.00.0903251411260.5675@gandalf.stny.rr.com>
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* Steven Rostedt <rostedt@goodmis.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