[Devel] Re: [PATCH 6/13] BC: kmemsize accounting (core)

[Pavel Emelianov]

Pekka Enberg wrote:
> Hi,
> 
> On 11/9/06, Kirill Korotaev <dev at sw.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.