linux-kernel - Re: [PATCH 9/13] BC: locked pages (charge hooks)

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Date:	Wed, 06 Sep 2006 12:45:01 +0400
From:	Pavel Emelianov <xemul@...nvz.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
CC:	Kirill Korotaev <dev@...ru>, Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Pavel Emelianov <xemul@...nvz.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	Rik van Riel <riel@...hat.com>, Andi Kleen <ak@...e.de>,
	Oleg Nesterov <oleg@...sign.ru>,
	Alexey Dobriyan <adobriyan@...l.ru>,
	Matt Helsley <matthltc@...ibm.com>,
	CKRM-Tech <ckrm-tech@...ts.sourceforge.net>,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: [PATCH 9/13] BC: locked pages (charge hooks)

Nick Piggin wrote:
> Kirill Korotaev wrote:
>
>> Introduce calls to BC core over the kernel to charge locked memory.
>>
>> Normaly new locked piece of memory may appear in insert_vm_struct,
>> but there are places (do_mmap_pgoff, dup_mmap etc) when new vma
>> is not inserted by insert_vm_struct(), but either link_vma-ed or
>> merged with some other - these places call BC code explicitly.
>>
>> Plus sys_mlock[all] itself has to be patched to charge/uncharge
>> needed amount of pages.
>
>
> I still haven't heard your good reasons why such a complex scheme is
> required when my really simple proposal of unconditionally charging
> the page to the container it was allocated by.
Charging the page to the container it was allocated in is a possible and
correct way, we agree, but how does this comment refer to locked pages
accounting?
>
> That has the benefit of not being full of user explotable holes and
> also not putting such a huge burden on mm/ and the wider kernel in
> general.
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