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

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Message-ID: <1375891895.6848.9.camel@gandalf.local.home>
Date:	Wed, 07 Aug 2013 12:11:35 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Ondřej Bílka <neleai@...nam.cz>,
	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 Wed, 2013-08-07 at 12:03 -0400, Mathieu Desnoyers wrote:

> You might want to try creating a global array of counters (accessible
> both from C for printout and assembly for update).
> 
> Index the array from assembly using:   (2f - 1f)
> 
> 1:
>         jmp ...;
> 2:
> 
> And put an atomic increment of the counter. This increment instruction
> should be located prior to the jmp for obvious reasons.
> 
> You'll end up with the sums you're looking for at indexes 2 and 5 of the
> array.

After I post the patches, feel free to knock yourself out.

-- Steve


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