linux-kernel - Re: [RFC][PATCH] tracepoints: Move the work out of line from hotpath sections

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Date:	Thu, 09 Aug 2012 23:09:04 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	David Daney <ddaney.cavm@...il.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Avi Kivity <avi@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH] tracepoints: Move the work out of line from
 hotpath sections

On Thu, 2012-08-09 at 22:05 -0400, Mathieu Desnoyers wrote:

> In your example, is the attribute attached to the if() or the following
> basic block ? Attaching it to the basic block allows a nice level of
> genericity:

Yes, I meant the block, not the if().

Heck, any block could be done this way, even just a block insertion...

void foo(int bar) {
	[...]

	__attribute__((section("mysection")) {
		/* code here is in 'mysection' */
	}
	[...]
}

All gcc would have to do is place a hard jump to the code in the
section, and have the section jump back.

-- Steve


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