Re: [RFC PATCH] mm: Add helpers for locked_vm

[Peter Zijlstra]

On Wed, Jul 30, 2014 at 07:28:13PM +1000, Alexey Kardashevskiy wrote:
> This adds 2 helpers to change the locked_vm counter:
> - try_increase_locked_vm - may fail if new locked_vm value will be greater
> than the RLIMIT_MEMLOCK limit;
> - decrease_locked_vm.
> 
> These will be used by drivers capable of locking memory by userspace
> request. For example, VFIO can use it to check if it can lock DMA memory
> or PPC-KVM can use it to check if it can lock memory for TCE tables.

Urgh no.. have a look here:

lkml.kernel.org/r/20140526145605.016140154@xxxxxxxxxxxxx

Someone needs to go help with the IB stuff, I got properly lost in
there.

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