[lkml]   [2006]   [Feb]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [Patch 4/4] Tell GCC 4.1 to move unlikely() code to a separate section
In-Reply-To: <>

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.

"Equations are the Devil's sentences." --Stephen Colbert

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-02-28 07:40    [from the cache]
©2003-2011 Jasper Spaans