linux-kernel - Re: [ckrm-tech] [PATCH 5/13] BC: user interface (syscalls)

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Date:	Wed, 06 Sep 2006 12:29:35 +0400
From:	Pavel Emelianov <xemul@...nvz.org>
To:	balbir@...ibm.com
CC:	Kirill Korotaev <dev@...ru>, Andrew Morton <akpm@...l.org>,
	Rik van Riel <riel@...hat.com>,
	CKRM-Tech <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>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Hugh Dickins <hugh@...itas.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Alexey Dobriyan <adobriyan@...l.ru>,
	Oleg Nesterov <oleg@...sign.ru>, devel@...nvz.org,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [ckrm-tech] [PATCH 5/13] BC: user interface (syscalls)

Balbir Singh wrote:
>> +
>> +asmlinkage long sys_set_bcid(bcid_t id)
>> +{
>> +    int error;
>> +    struct beancounter *bc;
>> +    struct task_beancounter *task_bc;
>> +
>> +    task_bc = &current->task_bc;
>
> I was playing around with the bc patches and found that to make
> use of bc's, I had to actually call set_bcid() and then exec() a
> task/shell so that the id would stick around. Would you consider
That sounds very strange as sys_set_bcid() actually changes current's
exec_bc.
One note is about mm's bc - mm obtains new bc only after fork or exec -
that's
true. But kmemsize starts charging right after the sys_set_bcid.
> changing sys_set_bcid to sys_set_task_bcid() or adding a new
> system call sys_set_task_bcid()? We could pass the pid that we
> intend to associate with the new id. This also means we'll need
> locking around to protect task->task_bc.

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