linux-kernel - Re: [ckrm-tech] [RFC][PATCH 3/7] UBC: ub context and inheritance

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Message-Id: <1156193301.6479.14.camel@linuxchandra>
Date:	Mon, 21 Aug 2006 13:48:21 -0700
From:	Chandra Seetharaman <sekharan@...ibm.com>
To:	Kirill Korotaev <dev@...ru>
Cc:	Rik van Riel <riel@...hat.com>, ckrm-tech@...ts.sourceforge.net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	hugh@...itas.com, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [ckrm-tech] [RFC][PATCH 3/7] UBC: ub context and inheritance

On Mon, 2006-08-21 at 14:32 +0400, Kirill Korotaev wrote:
> Chandra Seetharaman wrote:
> > On Wed, 2006-08-16 at 19:38 +0400, Kirill Korotaev wrote:
> > 
> >>Contains code responsible for setting UB on task,
> >>it's inheriting and setting host context in interrupts.
> >>
> >>Task references three beancounters:
> >>  1. exec_ub  current context. all resources are
> >>              charged to this beancounter.
> >>  2. task_ub  beancounter to which task_struct is
> >>              charged itself.
> > 
> > 
> > I do not see why task_ub is needed ? i do not see it being used
> > anywhere.
> it is used to charge task itself. will be heavily used in next patch set
> adding "numproc" UBC parameter.

Well, from your other responses it sounded like you are including
code/data structure/functionality only when they are used. So, I wasn't
clear if this is missed out on cleanup or really part of UBC.

Besides, if this is needed only for a specific controller, shouldn't the
controller worry about maintaining it ?

> 
> >>  3. fork_sub beancounter which is inherited by
> >>              task's children on fork
> > 
> > 
> >>From other emails it looks like renaming fork/exec to be real/effective
> > will be easier to understand.
> there is no "real". exec_ub is effective indeed,
> but fork_sub is the one to inherit on fork().

IMO, fork_cb/exec_cb doesn't convey the real meaning of the usage.
> 
> Kirill
> 
> 
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-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@...ibm.com   |      .......you may get it.
----------------------------------------------------------------------


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