Commit bf50bab2 authored by Naoya Horiguchi's avatar Naoya Horiguchi Committed by Andi Kleen
Browse files

hugetlb: add allocate function for hugepage migration 



We can't use existing hugepage allocation functions to allocate hugepage
for page migration, because page migration can happen asynchronously with
the running processes and page migration users should call the allocation
function with physical addresses (not virtual addresses) as arguments.

ChangeLog since v3:
- unify alloc_buddy_huge_page() and alloc_buddy_huge_page_node()

ChangeLog since v2:
- remove unnecessary get/put_mems_allowed() (thanks to David Rientjes)

ChangeLog since v1:
- add comment on top of alloc_huge_page_no_vma()

Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: default avatarMel Gorman <mel@csn.ul.ie>
Signed-off-by: default avatarJun'ichi Nomura <j-nomura@ce.jp.nec.com>
Reviewed-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
parent 998b4382

include/linux/hugetlb.h

+3 −0
Original line number Diff line number Diff line
@@ -228,6 +228,8 @@ struct huge_bootmem_page { 
	struct hstate *hstate;

};



struct page *alloc_huge_page_node(struct hstate *h, int nid);



/* arch callback */

int __init alloc_bootmem_huge_page(struct hstate *h);
@@ -303,6 +305,7 @@ static inline struct hstate *page_hstate(struct page *page) 


#else

struct hstate {};

#define alloc_huge_page_node(h, nid) NULL

#define alloc_bootmem_huge_page(h) NULL

#define hstate_file(f) NULL

#define hstate_vma(v) NULL

mm/hugetlb.c

+54 −25
Original line number Diff line number Diff line
@@ -466,11 +466,23 @@ static void enqueue_huge_page(struct hstate *h, struct page *page) 
	h->free_huge_pages_node[nid]++;

}



static struct page *dequeue_huge_page_node(struct hstate *h, int nid)

{

	struct page *page;



	if (list_empty(&h->hugepage_freelists[nid]))

		return NULL;

	page = list_entry(h->hugepage_freelists[nid].next, struct page, lru);

	list_del(&page->lru);

	h->free_huge_pages--;

	h->free_huge_pages_node[nid]--;

	return page;

}



static struct page *dequeue_huge_page_vma(struct hstate *h,

				struct vm_area_struct *vma,

				unsigned long address, int avoid_reserve)

{

	int nid;

	struct page *page = NULL;

	struct mempolicy *mpol;

	nodemask_t *nodemask;
@@ -496,21 +508,15 @@ static struct page *dequeue_huge_page_vma(struct hstate *h, 


	for_each_zone_zonelist_nodemask(zone, z, zonelist,

						MAX_NR_ZONES - 1, nodemask) {

		nid = zone_to_nid(zone);

		if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask) &&

		    !list_empty(&h->hugepage_freelists[nid])) {

			page = list_entry(h->hugepage_freelists[nid].next,

					  struct page, lru);

			list_del(&page->lru);

			h->free_huge_pages--;

			h->free_huge_pages_node[nid]--;



		if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask)) {

			page = dequeue_huge_page_node(h, zone_to_nid(zone));

			if (page) {

				if (!avoid_reserve)

					decrement_hugepage_resv_vma(h, vma);



				break;

			}

		}

	}

err:

	mpol_cond_put(mpol);

	put_mems_allowed();
@@ -770,11 +776,10 @@ static int free_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed, 
	return ret;

}



static struct page *alloc_buddy_huge_page(struct hstate *h,

			struct vm_area_struct *vma, unsigned long address)

static struct page *alloc_buddy_huge_page(struct hstate *h, int nid)

{

	struct page *page;

	unsigned int nid;

	unsigned int r_nid;



	if (h->order >= MAX_ORDER)

		return NULL;
@@ -812,9 +817,14 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, 
	}

	spin_unlock(&hugetlb_lock);



	if (nid == NUMA_NO_NODE)

		page = alloc_pages(htlb_alloc_mask|__GFP_COMP|

				   __GFP_REPEAT|__GFP_NOWARN,

				   huge_page_order(h));

	else

		page = alloc_pages_exact_node(nid,

			htlb_alloc_mask|__GFP_COMP|__GFP_THISNODE|

			__GFP_REPEAT|__GFP_NOWARN, huge_page_order(h));



	if (page && arch_prepare_hugepage(page)) {

		__free_pages(page, huge_page_order(h));
@@ -829,13 +839,13 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, 
		 */

		put_page_testzero(page);

		VM_BUG_ON(page_count(page));

		nid = page_to_nid(page);

		r_nid = page_to_nid(page);

		set_compound_page_dtor(page, free_huge_page);

		/*

		 * We incremented the global counters already

		 */

		h->nr_huge_pages_node[nid]++;

		h->surplus_huge_pages_node[nid]++;

		h->nr_huge_pages_node[r_nid]++;

		h->surplus_huge_pages_node[r_nid]++;

		__count_vm_event(HTLB_BUDDY_PGALLOC);

	} else {

		h->nr_huge_pages--;
@@ -847,6 +857,25 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, 
	return page;

}



/*

 * This allocation function is useful in the context where vma is irrelevant.

 * E.g. soft-offlining uses this function because it only cares physical

 * address of error page.

 */

struct page *alloc_huge_page_node(struct hstate *h, int nid)

{

	struct page *page;



	spin_lock(&hugetlb_lock);

	page = dequeue_huge_page_node(h, nid);

	spin_unlock(&hugetlb_lock);



	if (!page)

		page = alloc_buddy_huge_page(h, nid);



	return page;

}



/*

 * Increase the hugetlb pool such that it can accomodate a reservation

 * of size 'delta'.
@@ -871,7 +900,7 @@ static int gather_surplus_pages(struct hstate *h, int delta) 
retry:

	spin_unlock(&hugetlb_lock);

	for (i = 0; i < needed; i++) {

		page = alloc_buddy_huge_page(h, NULL, 0);

		page = alloc_buddy_huge_page(h, NUMA_NO_NODE);

		if (!page) {

			/*

			 * We were not able to allocate enough pages to
@@ -1052,7 +1081,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma, 
	spin_unlock(&hugetlb_lock);



	if (!page) {

		page = alloc_buddy_huge_page(h, vma, addr);

		page = alloc_buddy_huge_page(h, NUMA_NO_NODE);

		if (!page) {

			hugetlb_put_quota(inode->i_mapping, chg);

			return ERR_PTR(-VM_FAULT_SIGBUS);

CRA Git | Maintained and supported by SUSTech CRA and CCSE