linux-kernel - Re: RT sched: cpupri_vec lock contention with def_root

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Message-ID: <49248560.1020501@novell.com>
Date:	Wed, 19 Nov 2008 16:30:08 -0500
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Dimitri Sivanich <sivanich@....com>
CC:	Max Krasnyansky <maxk@...lcomm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: RT sched: cpupri_vec lock contention with def_root_domain and
 no load balance

Dimitri Sivanich wrote:
> On Wed, Nov 19, 2008 at 03:25:15PM -0500, Gregory Haskins wrote:
>   
>> It sounds like the problem with my code is that "null sched domain"
>> translates into "default root-domain" which is understandably unexpected
>> by Dimitri (and myself).  Really I intended root-domains to become
>> associated with each exclusive/disjoint cpuset that is created.  In a
>> way, non-balanced/isolated cpus could be modeled as an exclusive cpuset
>> with one member, but that is somewhat beyond the scope of the
>>     
>
> Actually, at one time, that is how things were setup.  Setting the
> cpu_exclusive bit on a single cpu cpuset would isolate that cpu from
> load balancing.
>   
Do you know if this was pre or post the root-domain code?  Here is a
reference to the commit:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=57d885fea0da0e9541d7730a9e1dcf734981a173

A bisection that shows when this last worked for you would be very
appreciated if you have the time, Dimitri.

Regards,
-Greg



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