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Message-ID: <1344568144.6935.97.camel@gandalf.stny.rr.com>
Subject: Re: [RFC][PATCH] tracepoints: Move the work out of line from
 hotpath sections
From: Steven Rostedt <rostedt@goodmis.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: David Daney <ddaney.cavm@gmail.com>,
        "H. Peter Anvin" <hpa@linux.intel.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Avi Kivity <avi@redhat.com>, Christoph Hellwig <hch@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>
Date: Thu, 09 Aug 2012 23:09:04 -0400
In-Reply-To: <20120810020523.GA18832@Krystal>
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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