Re: memcg: slab control

[Pavel Emelyanov <xemul@parallels.com>]

David Rientjes wrote:
> On Thu, 26 Nov 2009, Pavel Emelyanov wrote:
> 
>> I disagree. Bio-s are allocated in user context for all typical reads
>> (unless we requested aio) and are allocated either in pdflush context
>> or (!) in arbitrary task context for writes (e.g. via try_to_free_pages)
>> and thus such bio/buffer_head accounting will be completely random.
>>
> 
> pdflush has been removed, they should all be allocated in process context.

OK, but the try_to_free_pages() concern still stands.

>> We implement support for accounting based on a bit on a kmem_cache
>> structure and mark all kmalloc caches as not-accountable. Then we grep
>> the kernel to find all kmalloc-s and think - if a kmalloc is to be
>> accounted we turn this into kmem_cache_alloc() with dedicated
>> kmem_cache and mark it as accountable.
>>
> 
> That doesn't work with slab cache merging done in slub.

Surely we'll have to change it a bit.

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