Re: [PATCH 04/23] sched: Change NODE sched_domain group creation

[Andreas Herrmann]

On Thu, Apr 07, 2011 at 08:09:45AM -0400, Peter Zijlstra wrote:
> The NODE sched_domain is 'special' in that it allocates sched_groups
> per CPU, instead of sharing the sched_groups between all CPUs.
> 
> While this might have some benefits on large NUMA and avoid remote
> memory accesses when iterating the sched_groups, this does break
> current code that assumes sched_groups are shared between all
> sched_domains (since the dynamic cpu_power patches).
> 
> So refactor the NODE groups to behave like all other groups.
> 
> (The ALLNODES domain again shared its groups across the CPUs for some
> reason).
> 
> If someone does measure a performance decrease due to this change we

[...]

Will do some performance sniff tests to check this.


Andreas

-- 
Operating | Advanced Micro Devices GmbH
  System  | Einsteinring 24, 85609 Dornach b. München, Germany
 Research | Geschäftsführer: Alberto Bozzo, Andrew Bowd
  Center  | Sitz: Dornach, Gemeinde Aschheim, Landkreis München
  (OSRC)  | Registergericht München, HRB Nr. 43632


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/