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From: Peter Zijlstra <peterz@infradead.org>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>,
	Matt Fleming <matt@codeblueprint.co.uk>,
	mingo@kernel.org, linux-kernel@vger.kernel.org, clm@fb.com,
	mgalbraith@suse.de, tglx@linutronix.de, fweisbec@gmail.com,
	anton@samba.org, oliver <oohall@gmail.com>,
	"Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with sched_domain_shared
Date: Tue, 17 May 2016 13:15:38 +0200	[thread overview]
Message-ID: <20160517111538.GX3193@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160517105204.GA9986@linux.vnet.ibm.com>

On Tue, May 17, 2016 at 04:22:04PM +0530, Srikar Dronamraju wrote:
> > 
> > Maybe even something like so; which would make Power <= 6 use the
> > default topology and result in a shared LLC between the on package cores
> > etc..
> > 
> > Power7 is then special for not having a shared L3 but having the
> > asymmetric SMT thing and Power8 again gains the shared L3 while
> > retaining the asymmetric SMT stuff.
> 
> 
> Asymmetric SMT is only for Power 7. Its not enabled for Power 8.
> On Power8, if there are only 2 active threads assume thread 0 and thread
> 4 running in smt 8 mode, it would internally run as if running in smt 2
> mode without any scheduler tweaks. (This is unlike power 7).

Ah, good to know. In that case, you can use the generic topology for
everything except power7. IOW, just make that existing
set_sched_topology() call depend on CPU_FTRS_POWER7 or so (if that is
the correct magic incantation).

  reply	other threads:[~2016-05-17 11:15 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-09 10:48 [RFC][PATCH 0/7] sched: select_idle_siblings rewrite Peter Zijlstra
2016-05-09 10:48 ` [RFC][PATCH 1/7] sched: Remove unused @cpu argument from destroy_sched_domain*() Peter Zijlstra
2016-05-09 10:48 ` [RFC][PATCH 2/7] sched: Restructure destroy_sched_domain() Peter Zijlstra
2016-05-09 14:46   ` Peter Zijlstra
2016-05-09 10:48 ` [RFC][PATCH 3/7] sched: Introduce struct sched_domain_shared Peter Zijlstra
2016-05-09 10:48 ` [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with sched_domain_shared Peter Zijlstra
2016-05-11 11:55   ` Matt Fleming
2016-05-11 12:33     ` Peter Zijlstra
2016-05-11 18:11       ` Peter Zijlstra
2016-05-11 18:24       ` Peter Zijlstra
2016-05-12  2:05         ` Michael Neuling
2016-05-12  5:07           ` Peter Zijlstra
2016-05-12 11:07             ` Michael Neuling
2016-05-12 11:33               ` Peter Zijlstra
2016-05-13  0:12                 ` Michael Neuling
2016-05-16 14:00                   ` Peter Zijlstra
2016-05-17 10:20                     ` Peter Zijlstra
2016-05-17 10:52                       ` Srikar Dronamraju
2016-05-17 11:15                         ` Peter Zijlstra [this message]
2016-05-11 17:37     ` Peter Zijlstra
2016-05-11 18:04       ` Matt Fleming
2016-05-16 15:31   ` Dietmar Eggemann
2016-05-16 17:02     ` Peter Zijlstra
2016-05-16 17:26       ` Dietmar Eggemann
2016-05-09 10:48 ` [RFC][PATCH 5/7] sched: Rewrite select_idle_siblings() Peter Zijlstra
2016-05-10 21:05   ` Yuyang Du
2016-05-11  7:00     ` Peter Zijlstra
2016-05-10 23:42       ` Yuyang Du
2016-05-11  7:43         ` Mike Galbraith
2016-05-09 10:48 ` [RFC][PATCH 6/7] sched: Optimize SCHED_SMT Peter Zijlstra
2016-05-09 10:48 ` [RFC][PATCH 7/7] sched: debug muck -- not for merging Peter Zijlstra
2016-05-10  0:50 ` [RFC][PATCH 0/7] sched: select_idle_siblings rewrite Chris Mason
2016-05-11 14:19 ` Chris Mason
2016-05-18  5:51 ` [RFC][PATCH 8/7] sched/fair: Use utilization distance to filter affine sync wakeups Mike Galbraith
2016-05-19 21:43   ` Rik van Riel
2016-05-20  2:52     ` Mike Galbraith
2016-05-25 14:51 ` [RFC][PATCH 0/7] sched: select_idle_siblings rewrite Chris Mason
2016-05-25 16:24   ` Peter Zijlstra
2016-05-25 17:11     ` Chris Mason

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