linux-kernel - Re: [PATCH 6/13] BC: kmemsize accounting (core)

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Date:	Mon, 13 Nov 2006 15:13:41 +0300
From:	Pavel Emelianov <xemul@...nvz.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
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>, xemul@...nvz.org,
	devel@...nvz.org, oleg@...sign.ru, hch@...radead.org,
	matthltc@...ibm.com, ckrm-tech@...ts.sourceforge.net
Subject: Re: [PATCH 6/13] BC: kmemsize accounting (core)

Pekka Enberg wrote:
> Hi,
> 
> On 11/9/06, Kirill Korotaev <dev@...ru> wrote:
>> +#ifdef CONFIG_BEANCOUNTERS
>> +#define BC_EXTRASIZE   sizeof(struct beancounter *)
>> +static inline size_t slab_mgmt_size_noalign(int flags, size_t nr_objs)
>> +{
>> +       size_t size;
>> +
>> +       size = slab_mgmt_size_raw(nr_objs);
>> +       if (flags & SLAB_BC)
>> +               size = ALIGN(size, BC_EXTRASIZE) + nr_objs *
>> BC_EXTRASIZE;
>> +       return size;
> 
> Why do we want to track each allocated _object_ in the slab? Isn't
> tracking pages enough?

No. One page may contain objects allocated in different beancounters.
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