Messages in this thread | | | Date | Tue, 28 Feb 2006 01:34:07 -0500 | From | Chuck Ebbert <> | Subject | Re: [Patch 4/4] Tell GCC 4.1 to move unlikely() code to a separate section |
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In-Reply-To: <200602271639.34776.ak@suse.de>
On Mon, 27 Feb 2006 16:39:34, Andi Kleen wrote: > On Monday 27 February 2006 16:31, Arjan van de Ven wrote: > > This patch is more controversial I assume; it offers the option > > to use the gcc 4.1 option to move unlikely() code to a separate section. > > On the con side, this means that longer byte sequences are needed to jump > > to this code, on the Pro side it means that the unlikely() code isn't sharing > > icache cachelines and tlbs anymore. > > I don't think this will do anything because the default Makefile > still has > > CFLAGS += -fno-reorder-blocks
This also won't work for functions that specify an explicit section name, e.g. __sched, __kprobes etc. -- at least that's what the gcc 4.0.2 docs say.
-- Chuck "Equations are the Devil's sentences." --Stephen Colbert
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