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From: Balbir Singh <bsingharora@gmail.com>
To: Oliver O'Halloran <oohall@gmail.com>, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 5/5] powerpc/smp: Add Power9 scheduler topology
Date: Thu, 2 Mar 2017 21:25:59 +1100	[thread overview]
Message-ID: <3ef222c7-15f7-e981-394d-61cf4b26a1cc@gmail.com> (raw)
In-Reply-To: <20170302004920.21948-5-oohall@gmail.com>



On 02/03/17 11:49, Oliver O'Halloran wrote:
> In previous generations of Power processors each core had a private L2
> cache. The Power9 processor has a slightly different architecture where
> the L2 cache is shared among pairs of cores rather than being completely
> private.
> 
> Making the scheduler aware of this cache sharing allows the scheduler to
> make more intelligent migration decisions. When one core in the pair is
> overloaded tasks can be migrated to its paired core to improve throughput
> without cache-refilling penality typically associated with task
> migration.

Could you please describe the changes to sched_domains w.r.t before and
after for P9.

I think most of the changes make sense, but some data to back them up
including any results you have to show that these patches help would be
nice

Balbir Singh.

  reply	other threads:[~2017-03-02 10:26 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-02  0:49 [PATCH 1/5] powerpc/smp: use cpu_to_chip_id() to find siblings Oliver O'Halloran
2017-03-02  0:49 ` [PATCH 2/5] powerpc/smp: add set_cpus_related() Oliver O'Halloran
2017-03-15 11:18   ` Michael Ellerman
2017-03-23  1:27     ` Oliver O'Halloran
2017-03-28  1:15       ` Michael Ellerman
2017-03-02  0:49 ` [PATCH 3/5] powerpc/smp: Add update_cpu_masks() Oliver O'Halloran
2017-03-15 11:18   ` Michael Ellerman
2017-03-02  0:49 ` [PATCH 4/5] powerpc/smp: add cpu_cache_mask Oliver O'Halloran
2017-03-15 11:26   ` Michael Ellerman
2017-03-23  3:33     ` Oliver O'Halloran
2017-03-28  1:05       ` Michael Ellerman
2017-03-02  0:49 ` [PATCH 5/5] powerpc/smp: Add Power9 scheduler topology Oliver O'Halloran
2017-03-02 10:25   ` Balbir Singh [this message]
2017-03-15 11:33     ` Michael Ellerman
2017-03-15 11:30   ` Michael Ellerman
2017-03-02  3:44 ` [PATCH 1/5] powerpc/smp: use cpu_to_chip_id() to find siblings Balbir Singh
2017-03-15 11:18 ` Michael Ellerman
2017-03-23  1:09   ` Oliver O'Halloran
2017-03-28  3:03     ` Michael Ellerman
2017-03-28  3:23       ` Oliver O'Halloran

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