Commit 3a9180b0 authored by Ma Wupeng's avatar Ma Wupeng Committed by Wupeng Ma
Browse files

mm/mempolicy: Add and export get_vma_policy_node 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I9UDJX



--------------------------------

Function get_vma_policy_node is used to return a suitable nid for order-0
page allocation.

Signed-off-by: default avatarMa Wupeng <mawupeng1@huawei.com>
parent 39a8198a

include/linux/mempolicy.h

+4 −0
Original line number Diff line number Diff line
@@ -161,6 +161,10 @@ extern nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy); 


extern unsigned int mempolicy_slab_node(void);



int get_vma_policy_node(struct vm_area_struct *vma, unsigned long addr,

			gfp_t gfp_flags, struct mempolicy **mpol,

			nodemask_t **nodemask);



extern enum zone_type policy_zone;



static inline void check_highest_zone(enum zone_type k)

mm/mempolicy.c

+23 −0
Original line number Diff line number Diff line
@@ -2198,6 +2198,29 @@ static inline unsigned interleave_nid(struct mempolicy *pol, 
		return interleave_nodes(pol);

}



/* get policy node for order-0 page */

int get_vma_policy_node(struct vm_area_struct *vma, unsigned long addr,

			gfp_t gfp_flags, struct mempolicy **mpol,

			nodemask_t **nodemask)

{

	int nid, mode;



	*mpol = get_vma_policy(vma, addr);

	*nodemask = NULL;

	mode = (*mpol)->mode;



	if (unlikely(mode == MPOL_INTERLEAVE)) {

		nid = interleave_nid(*mpol, vma, addr, PAGE_SHIFT);

	} else {

		nid = policy_node(gfp_flags, *mpol, numa_node_id());

		if ((*mpol)->mode == MPOL_BIND || mode == MPOL_PREFERRED_MANY)

			*nodemask = &(*mpol)->v.nodes;

	}



	return nid;

}

EXPORT_SYMBOL_GPL(get_vma_policy_node);



#ifdef CONFIG_HUGETLBFS

/*

 * huge_node(@vma, @addr, @gfp_flags, @mpol)