linux-kernel - Re: [RFC] gcc feature request: Moving blocks into sections

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Message-ID: <20130807050601.GA5385@domone.kolej.mff.cuni.cz>
Date:	Wed, 7 Aug 2013 07:06:01 +0200
From:	Ondřej Bílka <neleai@...nam.cz>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, gcc <gcc@....gnu.org>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Daney <ddaney.cavm@...il.com>,
	Behan Webster <behanw@...verseincode.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections

On Tue, Aug 06, 2013 at 08:56:00PM -0400, Steven Rostedt wrote:
> On Tue, 2013-08-06 at 20:45 -0400, Steven Rostedt wrote:
> 
> > [    3.387362] short jumps: 106
> > [    3.390277]  long jumps: 330
> > 
> > Thus, approximately 25%. Not bad.
> 
> Also, where these happen to be is probably even more important than how
> many. If all the short jumps happen in slow paths, it's rather
> pointless. But they seem to be in some rather hot paths. I had it print
> out where it placed the short jumps too:
> 
 
> The kmem_cache_* and the try_to_wake_up* are the hot paths that caught
> my eye.
> 
> But still, is this worth it?
>
Add short_counter,long_counter and before increment counter before each
jump. That way we will know how many short/long jumps were taken. 
> -- Steve
> 

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