[Devel] Re: [ckrm-tech] [PATCH 9/13] BC: locked pages (charge hooks)

[Kirill Korotaev]

Nick,

> 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.
Nick can you elaborate what your proposal is?
Probably I missed it somewhere...

> 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.
I guess you will have to account locked pages still and
thus complexity won't be reduced much in this regard...

Thanks,
Kirill