linux-kernel - Re: [RFC] sched: CPU topology try

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140106162145.GL31570@twins.programming.kicks-ass.net>
Date:	Mon, 6 Jan 2014 17:21:45 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, pjt@...gle.com,
	Morten.Rasmussen@....com, cmetcalf@...era.com, tony.luck@...el.com,
	alex.shi@...aro.org, preeti@...ux.vnet.ibm.com,
	linaro-kernel@...ts.linaro.org, rjw@...k.pl,
	paulmck@...ux.vnet.ibm.com, corbet@....net, tglx@...utronix.de,
	len.brown@...el.com, arjan@...ux.intel.com,
	amit.kucheria@...aro.org, james.hogan@...tec.com,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
	Dietmar.Eggemann@....com
Subject: Re: [RFC] sched: CPU topology try

On Wed, Dec 18, 2013 at 02:13:51PM +0100, Vincent Guittot wrote:
> This patch applies on top of the two patches [1][2] that have been proposed by
> Peter for creating a new way to initialize sched_domain. It includes some minor
> compilation fixes and a trial of using this new method on ARM platform.
> [1] https://lkml.org/lkml/2013/11/5/239
> [2] https://lkml.org/lkml/2013/11/5/449
> 
> Based on the results of this tests, my feeling about this new way to init the
> sched_domain is a bit mitigated.

Yay :-)

> We can add more levels that will describe other dependency/independency like
> the frequency scaling dependency and as a result the final sched_domain
> topology will have additional levels (if they have not been removed during
> the degenerate sequence)

Yeah, this 'creative' use of degenerate domains is pretty neat ;-)

> My concern is about the configuration of the table that is used to create the
> sched_domain. Some levels are "duplicated" with different flags configuration
> which make the table not easily readable and we must also take care of the
> order  because parents have to gather all cpus of its childs. So we must
> choose which capabilities will be a subset of the other one. The order is
> almost straight forward when we describe 1 or 2 kind of capabilities
> (package ressource sharing and power sharing) but it can become complex if we
> want to add more.

I think I see what you're saying, although I hope that won't actually
happen in real hardware -- that said, people do tend to do crazy with
these ARM chips :/

We should also try and be conservative in the topology flags we want to
add, which should further reduce the amount of pain here.

For now I do think this is a viable approach.. Yes its a bit cumbersome
for these asymmetric systems but it does give us enough to start
playing.

I yet have to read Morton's emails on the P and C states, will try to
have a look at those tomorrow with a hopefully fresher brain -- somehow
its the end of the day already..
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/