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

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Message-ID: <44FDA024.7030700@in.ibm.com>
Date:	Tue, 05 Sep 2006 21:34:52 +0530
From:	Balbir Singh <balbir@...ibm.com>
To:	Kirill Korotaev <dev@...ru>
Cc:	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)

> +
> +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
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.


-- 

	Balbir Singh,
	Linux Technology Center,
	IBM Software Labs
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