lkml.org 
[lkml]   [2006]   [Jan]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
DateFri, 27 Jan 2006 19:14:00 -0800
FromPaul Jackson <>
SubjectRe: 2.6.16 - sys_sched_getaffinity & hotplug
Jack wrote:
> Should the following change be made to sched_getaffinity().
>
> Index: linux/kernel/sched.c
> ===================================================================
> --- linux.orig/kernel/sched.c 2006-01-25 08:50:21.401747695 -0600
> +++ linux/kernel/sched.c 2006-01-27 16:57:24.504871895 -0600
> @@ -4031,7 +4031,7 @@ long sched_getaffinity(pid_t pid, cpumas
> goto out_unlock;
>
> retval = 0;
> - cpus_and(*mask, p->cpus_allowed, cpu_possible_map);
> + cpus_and(*mask, p->cpus_allowed, cpu_online_map);

Adding Robert Love to the cc list, as he is Mr. sched_getaffinity,
I believe.

I ended up doing a similar change, to the cpus (and mems) masks
in the root (all encompassing) cpuset. These now show the values
of cpu_online_map and node_online_map, not *_MASK_ALL.

My hunches are:
* This change to cpu_online_map is a good one.
* The man page sentence "Usually, all bits in the mask are set."
might have meant something when it was written, but it is not
now clear what.

--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.925.600.0401
-
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: 2006-01-28 04:20    [from the cache]
©2003-2010