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Re: [PATCH] cpuset and sched domains: sched_load_balance flag

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From: Paul Jackson <pj@...>
To: Nick Piggin <nickpiggin@...>
Cc: <akpm@...>, <menage@...>, <linux-kernel@...>, <dino@...>, <cpw@...>, <mingo@...>
Subject: Re: [PATCH] cpuset and sched domains: sched_load_balance flag
Date: Monday, October 1, 2007 - 2:15 pm

Nick wrote:

Hmmm ... this could be the key to this discussion.

Nick - can two sched domains overlap?  And if they do, what does that
mean on any user or application behaviour.

From the cpuset side - this patch handles overlap by joining the 'cpus'
into one sched domain.  If two cpusets with overlapping 'cpus' are both
marked 'sched_load_balance', then this patch forms a single, combined
sched domain.

As best as I can tell, you and I are actually in agreement in the
case that there is no overlap.  If the several cpusets which have
'sched_load_balance' enabled have mutually disjoint 'cpus' (no
overlap), then my patch forms exactly one sched domain for each such
cpuset, having the same 'cpus'.

The issue is the overlapping cases - are overlapping sched domains
allowed, and if so, how do they affect user space?

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401
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Messages in current thread:
[PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Sun Sep 30, 6:44 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Randy Dunlap, (Tue Oct 2, 4:22 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Tue Oct 2, 4:57 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Ingo Molnar, (Sun Sep 30, 1:33 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Sat Sep 29, 3:21 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Sun Sep 30, 2:07 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Sat Sep 29, 11:34 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Mon Oct 1, 2:15 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Tue Oct 2, 9:35 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Wed Oct 3, 3:25 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Tue Oct 2, 12:14 pm)
[patch] sched: fix sched-domains partitioning by cpusets, Ingo Molnar, (Wed Oct 3, 2:22 am)
Re: [patch] sched: fix sched-domains partitioning by cpusets, Paul Jackson, (Wed Oct 3, 2:56 am)
Re: [patch] sched: fix sched-domains partitioning by cpusets, Nick Piggin, (Tue Oct 2, 11:46 am)
Re: [patch] sched: fix sched-domains partitioning by cpusets, Paul Jackson, (Wed Oct 3, 5:21 am)
Re: [patch] sched: fix sched-domains partitioning by cpusets, Nick Piggin, (Tue Oct 2, 1:23 pm)
Re: [patch] sched: fix sched-domains partitioning by cpusets, Paul Jackson, (Wed Oct 3, 6:08 am)
Re: [patch] sched: fix sched-domains partitioning by cpusets, Ingo Molnar, (Wed Oct 3, 5:35 am)
Re: [patch] sched: fix sched-domains partitioning by cpusets, Paul Jackson, (Wed Oct 3, 5:39 am)
Re: [patch] sched: fix sched-domains partitioning by cpusets, Nick Piggin, (Tue Oct 2, 1:29 pm)
Re: [patch] sched: fix sched-domains partitioning by cpusets, Ingo Molnar, (Wed Oct 3, 3:20 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Sun Sep 30, 11:42 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Tue Oct 2, 9:05 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Wed Oct 3, 2:58 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Tue Oct 2, 12:09 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Wed Oct 3, 5:55 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Tue Oct 2, 1:56 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Wed Oct 3, 8:17 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Tue Oct 2, 4:31 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Wed Oct 3, 1:44 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Wed Oct 3, 7:38 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Tue Oct 2, 3:25 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Wed Oct 3, 8:14 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Tue Oct 2, 3:53 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Wed Oct 3, 8:41 am)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Nick Piggin, (Tue Oct 2, 4:30 pm)
Re: [PATCH] cpuset and sched domains: sched_load_balance flag, Paul Jackson, (Wed Oct 3, 1:46 pm)
[PATCH] cpuset decrustify update and validate masks, Paul Jackson, (Sun Sep 30, 6:44 am)