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Date: Thu, 17 Nov 2022 13:15:01 -0800
From: Sidhartha Kumar <sidhartha.kumar@...cle.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: akpm@...ux-foundation.org, songmuchun@...edance.com,
mike.kravetz@...cle.com, willy@...radead.org,
almasrymina@...gle.com, linmiaohe@...wei.com, hughd@...gle.com,
Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH mm-unstable v3 10/10] mm/hugetlb: change hugetlb allocation functions to return a folio
Many hugetlb allocation helper functions have now been converting to
folios, update their higher level callers to be compatible with folios.
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
---
mm/hugetlb.c | 98 ++++++++++++++++++++++++----------------------------
1 file changed, 46 insertions(+), 52 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 6ecf9874c521..aa0a388bded4 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1378,7 +1378,7 @@ static void free_gigantic_folio(struct folio *folio, unsigned int order)
}
#ifdef CONFIG_CONTIG_ALLOC
-static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
+static struct folio *alloc_gigantic_folio(struct hstate *h, gfp_t gfp_mask,
int nid, nodemask_t *nodemask)
{
unsigned long nr_pages = pages_per_huge_page(h);
@@ -1394,7 +1394,7 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
page = cma_alloc(hugetlb_cma[nid], nr_pages,
huge_page_order(h), true);
if (page)
- return page;
+ return page_folio(page);
}
if (!(gfp_mask & __GFP_THISNODE)) {
@@ -1405,17 +1405,16 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
page = cma_alloc(hugetlb_cma[node], nr_pages,
huge_page_order(h), true);
if (page)
- return page;
+ return page_folio(page);
}
}
}
#endif
-
- return alloc_contig_pages(nr_pages, gfp_mask, nid, nodemask);
+ return page_folio(alloc_contig_pages(nr_pages, gfp_mask, nid, nodemask));
}
#else /* !CONFIG_CONTIG_ALLOC */
-static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
+static struct folio *alloc_gigantic_folio(struct hstate *h, gfp_t gfp_mask,
int nid, nodemask_t *nodemask)
{
return NULL;
@@ -1423,7 +1422,7 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
#endif /* CONFIG_CONTIG_ALLOC */
#else /* !CONFIG_ARCH_HAS_GIGANTIC_PAGE */
-static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
+static struct folio *alloc_gigantic_folio(struct hstate *h, gfp_t gfp_mask,
int nid, nodemask_t *nodemask)
{
return NULL;
@@ -1948,7 +1947,7 @@ pgoff_t hugetlb_basepage_index(struct page *page)
return (index << compound_order(page_head)) + compound_idx;
}
-static struct page *alloc_buddy_huge_page(struct hstate *h,
+static struct folio *alloc_buddy_hugetlb_folio(struct hstate *h,
gfp_t gfp_mask, int nid, nodemask_t *nmask,
nodemask_t *node_alloc_noretry)
{
@@ -2007,7 +2006,7 @@ static struct page *alloc_buddy_huge_page(struct hstate *h,
if (node_alloc_noretry && !page && alloc_try_hard)
node_set(nid, *node_alloc_noretry);
- return page;
+ return page_folio(page);
}
/*
@@ -2017,23 +2016,21 @@ static struct page *alloc_buddy_huge_page(struct hstate *h,
* Note that returned page is 'frozen': ref count of head page and all tail
* pages is zero.
*/
-static struct page *alloc_fresh_huge_page(struct hstate *h,
+static struct folio *alloc_fresh_hugetlb_folio(struct hstate *h,
gfp_t gfp_mask, int nid, nodemask_t *nmask,
nodemask_t *node_alloc_noretry)
{
- struct page *page;
struct folio *folio;
bool retry = false;
retry:
if (hstate_is_gigantic(h))
- page = alloc_gigantic_page(h, gfp_mask, nid, nmask);
+ folio = alloc_gigantic_folio(h, gfp_mask, nid, nmask);
else
- page = alloc_buddy_huge_page(h, gfp_mask,
+ folio = alloc_buddy_hugetlb_folio(h, gfp_mask,
nid, nmask, node_alloc_noretry);
- if (!page)
+ if (!folio)
return NULL;
- folio = page_folio(page);
if (hstate_is_gigantic(h)) {
if (!prep_compound_gigantic_folio(folio, huge_page_order(h))) {
/*
@@ -2050,7 +2047,7 @@ static struct page *alloc_fresh_huge_page(struct hstate *h,
}
prep_new_hugetlb_folio(h, folio, folio_nid(folio));
- return page;
+ return folio;
}
/*
@@ -2060,21 +2057,21 @@ static struct page *alloc_fresh_huge_page(struct hstate *h,
static int alloc_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed,
nodemask_t *node_alloc_noretry)
{
- struct page *page;
+ struct folio *folio;
int nr_nodes, node;
gfp_t gfp_mask = htlb_alloc_mask(h) | __GFP_THISNODE;
for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) {
- page = alloc_fresh_huge_page(h, gfp_mask, node, nodes_allowed,
- node_alloc_noretry);
- if (page)
+ folio = alloc_fresh_hugetlb_folio(h, gfp_mask, node,
+ nodes_allowed, node_alloc_noretry);
+ if (folio)
break;
}
- if (!page)
+ if (!folio)
return 0;
- free_huge_page(page); /* free it into the hugepage allocator */
+ free_huge_page(&folio->page); /* free it into the hugepage allocator */
return 1;
}
@@ -2235,7 +2232,7 @@ int dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn)
static struct page *alloc_surplus_huge_page(struct hstate *h, gfp_t gfp_mask,
int nid, nodemask_t *nmask)
{
- struct page *page = NULL;
+ struct folio *folio = NULL;
if (hstate_is_gigantic(h))
return NULL;
@@ -2245,8 +2242,8 @@ static struct page *alloc_surplus_huge_page(struct hstate *h, gfp_t gfp_mask,
goto out_unlock;
spin_unlock_irq(&hugetlb_lock);
- page = alloc_fresh_huge_page(h, gfp_mask, nid, nmask, NULL);
- if (!page)
+ folio = alloc_fresh_hugetlb_folio(h, gfp_mask, nid, nmask, NULL);
+ if (!folio)
return NULL;
spin_lock_irq(&hugetlb_lock);
@@ -2258,43 +2255,42 @@ static struct page *alloc_surplus_huge_page(struct hstate *h, gfp_t gfp_mask,
* codeflow
*/
if (h->surplus_huge_pages >= h->nr_overcommit_huge_pages) {
- SetHPageTemporary(page);
+ folio_set_hugetlb_temporary(folio);
spin_unlock_irq(&hugetlb_lock);
- free_huge_page(page);
+ free_huge_page(&folio->page);
return NULL;
}
h->surplus_huge_pages++;
- h->surplus_huge_pages_node[page_to_nid(page)]++;
+ h->surplus_huge_pages_node[folio_nid(folio)]++;
out_unlock:
spin_unlock_irq(&hugetlb_lock);
- return page;
+ return &folio->page;
}
static struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
int nid, nodemask_t *nmask)
{
- struct page *page;
+ struct folio *folio;
if (hstate_is_gigantic(h))
return NULL;
- page = alloc_fresh_huge_page(h, gfp_mask, nid, nmask, NULL);
- if (!page)
+ folio = alloc_fresh_hugetlb_folio(h, gfp_mask, nid, nmask, NULL);
+ if (!folio)
return NULL;
/* fresh huge pages are frozen */
- set_page_refcounted(page);
-
+ folio_ref_unfreeze(folio, 1);
/*
* We do not account these pages as surplus because they are only
* temporary and will be released properly on the last reference
*/
- SetHPageTemporary(page);
+ folio_set_hugetlb_temporary(folio);
- return page;
+ return &folio->page;
}
/*
@@ -2743,19 +2739,18 @@ void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
}
/*
- * alloc_and_dissolve_huge_page - Allocate a new page and dissolve the old one
+ * alloc_and_dissolve_hugetlb_folio - Allocate a new folio and dissolve
+ * the old one
* @h: struct hstate old page belongs to
* @old_page: Old page to dissolve
* @list: List to isolate the page in case we need to
* Returns 0 on success, otherwise negated error.
*/
-static int alloc_and_dissolve_huge_page(struct hstate *h, struct page *old_page,
- struct list_head *list)
+static int alloc_and_dissolve_hugetlb_folio(struct hstate *h,
+ struct folio *old_folio, struct list_head *list)
{
gfp_t gfp_mask = htlb_alloc_mask(h) | __GFP_THISNODE;
- struct folio *old_folio = page_folio(old_page);
int nid = folio_nid(old_folio);
- struct page *new_page;
struct folio *new_folio;
int ret = 0;
@@ -2766,26 +2761,25 @@ static int alloc_and_dissolve_huge_page(struct hstate *h, struct page *old_page,
* the pool. This simplifies and let us do most of the processing
* under the lock.
*/
- new_page = alloc_buddy_huge_page(h, gfp_mask, nid, NULL, NULL);
- if (!new_page)
+ new_folio = alloc_buddy_hugetlb_folio(h, gfp_mask, nid, NULL, NULL);
+ if (!new_folio)
return -ENOMEM;
- new_folio = page_folio(new_page);
__prep_new_hugetlb_folio(h, new_folio);
retry:
spin_lock_irq(&hugetlb_lock);
if (!folio_test_hugetlb(old_folio)) {
/*
- * Freed from under us. Drop new_page too.
+ * Freed from under us. Drop new_folio too.
*/
goto free_new;
} else if (folio_ref_count(old_folio)) {
/*
- * Someone has grabbed the page, try to isolate it here.
+ * Someone has grabbed the folio, try to isolate it here.
* Fail with -EBUSY if not possible.
*/
spin_unlock_irq(&hugetlb_lock);
- ret = isolate_hugetlb(old_page, list);
+ ret = isolate_hugetlb(&old_folio->page, list);
spin_lock_irq(&hugetlb_lock);
goto free_new;
} else if (!folio_test_hugetlb_freed(old_folio)) {
@@ -2863,7 +2857,7 @@ int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list)
if (folio_ref_count(folio) && !isolate_hugetlb(&folio->page, list))
ret = 0;
else if (!folio_ref_count(folio))
- ret = alloc_and_dissolve_huge_page(h, &folio->page, list);
+ ret = alloc_and_dissolve_hugetlb_folio(h, folio, list);
return ret;
}
@@ -3081,14 +3075,14 @@ static void __init hugetlb_hstate_alloc_pages_onenode(struct hstate *h, int nid)
if (!alloc_bootmem_huge_page(h, nid))
break;
} else {
- struct page *page;
+ struct folio *folio;
gfp_t gfp_mask = htlb_alloc_mask(h) | __GFP_THISNODE;
- page = alloc_fresh_huge_page(h, gfp_mask, nid,
+ folio = alloc_fresh_hugetlb_folio(h, gfp_mask, nid,
&node_states[N_MEMORY], NULL);
- if (!page)
+ if (!folio)
break;
- free_huge_page(page); /* free it into the hugepage allocator */
+ free_huge_page(&folio->page); /* free it into the hugepage allocator */
}
cond_resched();
}
--
2.38.1
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