[PATCH 1/6 mm] swapoff: scan ptes preemptibly

[Balbir Singh]

Hugh Dickins wrote:
> Provided that CONFIG_HIGHPTE is not set, unuse_pte_range can reduce latency
> in swapoff by scanning the page table preemptibly: so long as unuse_pte is
> careful to recheck that entry under pte lock.
> 
> (To tell the truth, this patch was not inspired by any cries for lower
> latency here: rather, this restructuring permits a future memory controller
> patch to allocate with GFP_KERNEL in unuse_pte, where before it could not.
> But it would be wrong to tuck this change away inside a memcgroup patch.)
> 
> Signed-off-by: Hugh Dickins <hugh at veritas.com>
> ---

Looks good to me

Acked-by: Balbir Singh <balbir at linux.vnet.ibm.com> and earlier
Tested-by: Balbir Singh <balbir at linux.vnet.ibm.com>

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL