linux-kernel - Re: [RFC][PATCH] tracing/module: Move tracepoint out of module.h

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Message-ID: <87lionjr41.fsf@rustcorp.com.au>
Date:	Wed, 01 Feb 2012 11:40:22 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Li Zefan <lizf@...fujitsu.com>
Subject: Re: [RFC][PATCH] tracing/module: Move tracepoint out of module.h

On Tue, 31 Jan 2012 13:20:16 +0100, Ingo Molnar <mingo@...e.hu> wrote:
> > Wow, we're really bikeshedding this!
> 
> Hey, I don't think this is bikesheddig: we are shedding 
> *kilobytes* of code from pretty hot codepaths, that kind of 
> topic does deserve some detailed attention :-)

I agree, but we put the bloat in without this much discussion :)

I get the impression last I looked that most get/put aren't actually hot
paths (though it was designed to allow that, such as an inc per packet).
Which is an even better reason to out-of-line it...

> > Doesn't save me much here, though.  What are your stats?
> 
> I suspect it depends on inlining options in the .config plus on 
> event tracing?
...
> Most distro kernels do tracepoints so I guess that's where the 
> size delta comes from :-) In any case:
> 

Yeah, I'm rebuilding an Ubuntu config kernel before and after to get
some more accurate stats on the final result for the commit message.

> Acked-by: Ingo Molnar <mingo@...e.hu>

Thanks,
Rusty.
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