linux-kernel - Re: Cache Allocation Technology Design

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Message-ID: <20141030124440.GB29540@htj.dyndns.org>
Date:	Thu, 30 Oct 2014 08:44:40 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Vikas Shivappa <vikas.shivappa@...el.com>,
	"Auld, Will" <will.auld@...el.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Fleming, Matt" <matt.fleming@...el.com>
Subject: Re: Cache Allocation Technology Design

On Thu, Oct 30, 2014 at 08:14:24AM +0100, Peter Zijlstra wrote:
> On Thu, Oct 30, 2014 at 08:07:25AM +0100, Peter Zijlstra wrote:
> > > and always allow execution of member tasks.
> 
> This too btw is not strictly speaking possible for all controllers. Most
> all sched controllers live by the grace of forcing tasks not to run at
> times (eg. the bandwidth controls), falsifying the 'always'.

Oh sure, the a task just has to run in a foreseeable future, or
rather, a task must not be blocked indefinitely requiring userland
intervention to become executable again.

Thanks.

-- 
tejun
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