Re: [PATCH 2.6.16-mm1 2/2] sched_domains: Allocate sched_groups dynamically

[Paul Jackson <pj@sgi.com>]

Suresh wrote:
> It is quite possible that the kernel you are testing doesn't have multi-core
> scheduler domain. If so, then you may not run into this issue.

Aha - we have a winner.

CONFIG_SCHED_MC was not enabled in this kernel.

Now what I see matches what it should.

    On a Hyper-Thread (but not Multi-Core) x86_64 system that I
    tested with CONFIG_SCHED_MC enabled, your patch was required to
    keep single-cpu cpu_exclusive cpusets from instantly locking
    up the system.

    On a Multi-Core (but not Hyper-Thread) IA64 Montecito system
    that did -not- have CONFIG_SCHED_MC enabled, there is no
    such problem with single-cpu cpu_exclusive cpusets in the
    first place.  It worked ok, even without the patch.

Thank-you.

-- 
                  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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