lkml.org 
[lkml]   [2007]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu access overhead
From
From: Christoph Lameter <clameter@sgi.com>
Date: Thu, 1 Nov 2007 06:01:14 -0700 (PDT)

> On Thu, 1 Nov 2007, David Miller wrote:
>
> > IA64 seems to use it universally for every __get_cpu_var()
> > access, so maybe it works out somehow :-)))
>
> IA64 does not do that. It addds the local cpu offset
>
> #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var,
> __ia64_per_cpu_var(local_per_cpu_offset)))
> #define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var,
> __ia64_per_cpu_var(local_per_cpu_offset)))

Oh I see, it's the offset itself which is accessed at the fixed
virtual address slot.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-11-01 22:29    [W:0.049 / U:0.708 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site