lkml.org 
[lkml]   [2002]   [Mar]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] syscall interface for cpu affinity
From
Date
Robert Love <rml@tech9.net> writes:

> On Sun, 2002-03-10 at 15:29, Andreas Jaeger wrote:
>
>> Please add the procinterface also! I've found it today (for 2.4.18)
>> and it's much easier to use with existing programs.
>
> I agree and I really like the proc-interface. There is something uber
> cool about:
>
> cat 1 > /proc/pid/affinity

I agree.

> I have a patch for 2.5.6 for proc-based affinity interface here:
>
> http://www.kernel.org/pub/linux/kernel/people/rml/cpu-affinity/v2.5/cpu-affinity-proc-rml-2.5.6-1.patch
>
> I suspect, however, that despite both patches being small we really only
> want to pick and standardize on one. The syscall interface has two main
> things going for it against a proc-based implementation: it is faster
> and /proc may not be mounted. The masses have spoken on this issue.
>
> Note you can use the syscall interface with existing programs, too.
> Just write a program to take in a pid and mask and call
> sched_set_affinity.

What I need at the moment is a wrapper - and you can do it two ways:

$ run_with_affinity 1 program arguments...
$ (cat 1 > /proc/self/affinity; program arguments...)

The second one is much easier coded ;-)

>> Please add it for all archs - this is not only interesting for x86,
>
> I'll send Linus the patch for other arches if/when he accepts this patch
> - I have no problem with that.

Thanks,
Andreas
--
Andreas Jaeger
SuSE Labs aj@suse.de
private aj@arthur.inka.de
http://www.suse.de/~aj
-
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: 2005-03-22 13:24    [W:0.121 / U:0.128 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site