lkml.org 
[lkml]   [2004]   [Oct]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [Lse-tech] [RFC PATCH] scheduler: Dynamic sched_domains
Date
On Saturday 09 October 2004 03:05, Matthew Dobson wrote:
> On Fri, 2004-10-08 at 15:51, Erich Focht wrote:
> > We're building this from bottom (cpus) up and need to take care of the
> > unlinking of the global domain when inserting something. But otherwise
> > this could be sufficient.
>
> I personally like to think of it from the top down. The internal API I
> came up with looks like:
>
> create_domain(parent_domain, type);
> destroy_domain(domain);
> add_cpu_to_domain(cpu, domain);
>
> So you basically build your domain from the top down, from your 1 or
> more top-level domains, down to your lowest level domains. You then add
> cpus (1 or more per domain) to the leaf domains in the tree you built.
> Those cpus cascade up the tree, and the whole tree knows exactly which
> cpus are contained in each domain in it.
>
> I think these are the three main functions you need to construct pretty
> much any conceivable, useful sched_domains hierarchy.

I'd suggest adding:
reparent_domain(domain, new_parent_domain);

When I said that the domains tree is standing on its leaves I meant
that the core components are the CPUs. Or the Nodes, if you already
have them. Or some supernodes, if you already have them. In a "normal"
filesystem you have the root directory, create subdirectories and
create files in them. Here you already have the files but not the
structure (or the simplest possible structure).

Anyhow, the 4 command API can well be the guts of the directory
operations API which I proposed.

Regards,
Erich

-
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 14:06    [W:0.074 / U:0.272 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site