linux-kernel - Re: [PATCH 12/15] sched: Allow NODE domain to be parent of MC instead of CPU domain

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 25 Aug 2009 10:55:31 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/15] sched: Allow NODE domain to be parent of MC
	instead of CPU domain

On Mon, Aug 24, 2009 at 05:32:40PM +0200, Peter Zijlstra wrote:
> On Thu, 2009-08-20 at 15:42 +0200, Andreas Herrmann wrote:
> > The level of NODE domain's child domain is provided in s_data.numa_child_level.
> > Then several adaptions are required when creating the domain hierarchy.
> > In case NODE domain is parent of MC domain we have to:
> > - limit NODE domains' span in sched_domain_node_span() to not exceed
> >   corresponding topology_core_cpumask.
> > - fix CPU domain span to cover entire cpu_map
> > - fix CPU domain sched groups to cover entire physical groups instead of
> >   covering a node (a node sched_group might be a proper subset of a CPU
> >   sched_group).
> > - use correct child domain in init_numa_sched_groups_power() when
> >   calculating sched_group.__cpu_power in NODE domain
> > - calculate group_power of NODE domain after its child domain
> > 
> > Note: As I have no idea when the ALLNODES domain is required
> >       I assumed that an ALLNODES domain exists only if NODE domain
> >       is parent of CPU domain.
> 
> I think its only used when the regular node level is too large, then we
> split it into smaller bits. SGI folks who run crazy large machines use
> this.

Ok.

> /me mumbels about renaming the domain level, CPU is the physical socket
> level, right? stupid names.
> 
> Patch sounds funky though, numa_child_level should be effident from the
> tree build.

In the current code the numa_child_level must be known before/while
the tree is built. Of course once the tree is ready, the child domain
is known (apart from degeneration).

Andreas

-- 
Operating | Advanced Micro Devices GmbH
  System  | Karl-Hammerschmidt-Str. 34, 85609 Dornach b. München, Germany
 Research | Geschäftsführer: Thomas M. McCoy, Giuliano Meroni
  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@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/