linux-kernel - Re: Cache Allocation Technology Design

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Message-ID: <alpine.DEB.2.10.1410291036070.26215@vshiva-Udesk>
Date:	Wed, 29 Oct 2014 10:41:47 -0700 (PDT)
From:	Vikas Shivappa <vikas.shivappa@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	"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>,
	Tejun Heo <tj@...nel.org>,
	"Shivappa, Vikas" <vikas.shivappa@...el.com>
Subject: Re: Cache Allocation Technology Design



On Wed, 29 Oct 2014, Peter Zijlstra wrote:

> On Wed, Oct 29, 2014 at 04:32:04PM +0000, Auld, Will wrote:
>> I maybe repeating what Peter has just said but for elements in the
>> hierarchy where the mask is the same as its parents mask there is no
>> need for a separate CLOS even in the case where there are tasks in the
>> group. So we can inherit the CLOS of the parent until which time both
>> the mask is different than the parent and there are tasks in the
>> group.
>
> I did not state that explicitly, but I did think about that. We could
> still wait to allocate a CLOS until at least one such group acquires a
> task.
>

Was wondering if it is a requirement of the 'full hierarchy' for the 
child to inherit the cbm of parent ? .
Alternately we can allocate the CLOSid when a cgroup 
is created and have an empty cbm - but dont let the tasks to be added 
unless the user assigns a cbm. Cpuset does something similar where 
its necessary to set the cpu mask(empty by default) of a cgroup before adding 
tasks.
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