[PATCH v4 03/11] mm/hugetlb: unify migration callbacks
From: js1304
Date: Tue Jul 07 2020 - 03:45:23 EST
From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
There is no difference between two migration callback functions,
alloc_huge_page_node() and alloc_huge_page_nodemask(), except
__GFP_THISNODE handling. It's redundant to have two almost similar
functions in order to handle this flag. So, this patch tries to
remove one by introducing a new argument, gfp_mask, to
alloc_huge_page_nodemask().
After introducing gfp_mask argument, it's caller's job to provide correct
gfp_mask. So, every callsites for alloc_huge_page_nodemask() are changed
to provide gfp_mask.
Note that it's safe to remove a node id check in alloc_huge_page_node()
since there is no caller passing NUMA_NO_NODE as a node id.
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
---
include/linux/hugetlb.h | 26 ++++++++++++++++++--------
mm/hugetlb.c | 35 ++---------------------------------
mm/mempolicy.c | 10 ++++++----
mm/migrate.c | 11 +++++++----
4 files changed, 33 insertions(+), 49 deletions(-)
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 50650d0..bb93e95 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -10,6 +10,7 @@
#include <linux/list.h>
#include <linux/kref.h>
#include <linux/pgtable.h>
+#include <linux/gfp.h>
struct ctl_table;
struct user_struct;
@@ -504,9 +505,8 @@ struct huge_bootmem_page {
struct page *alloc_huge_page(struct vm_area_struct *vma,
unsigned long addr, int avoid_reserve);
-struct page *alloc_huge_page_node(struct hstate *h, int nid);
struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
- nodemask_t *nmask);
+ nodemask_t *nmask, gfp_t gfp_mask);
struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
unsigned long address);
struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
@@ -692,6 +692,15 @@ static inline bool hugepage_movable_supported(struct hstate *h)
return true;
}
+/* Movability of hugepages depends on migration support. */
+static inline gfp_t htlb_alloc_mask(struct hstate *h)
+{
+ if (hugepage_movable_supported(h))
+ return GFP_HIGHUSER_MOVABLE;
+ else
+ return GFP_HIGHUSER;
+}
+
static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
struct mm_struct *mm, pte_t *pte)
{
@@ -759,13 +768,9 @@ static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
return NULL;
}
-static inline struct page *alloc_huge_page_node(struct hstate *h, int nid)
-{
- return NULL;
-}
-
static inline struct page *
-alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask)
+alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
+ nodemask_t *nmask, gfp_t gfp_mask)
{
return NULL;
}
@@ -878,6 +883,11 @@ static inline bool hugepage_movable_supported(struct hstate *h)
return false;
}
+static inline gfp_t htlb_alloc_mask(struct hstate *h)
+{
+ return 0;
+}
+
static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
struct mm_struct *mm, pte_t *pte)
{
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 7e5ba5c0..3245aa0 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1089,15 +1089,6 @@ static struct page *dequeue_huge_page_nodemask(struct hstate *h, gfp_t gfp_mask,
return NULL;
}
-/* Movability of hugepages depends on migration support. */
-static inline gfp_t htlb_alloc_mask(struct hstate *h)
-{
- if (hugepage_movable_supported(h))
- return GFP_HIGHUSER_MOVABLE;
- else
- return GFP_HIGHUSER;
-}
-
static struct page *dequeue_huge_page_vma(struct hstate *h,
struct vm_area_struct *vma,
unsigned long address, int avoid_reserve,
@@ -1979,31 +1970,9 @@ struct page *alloc_buddy_huge_page_with_mpol(struct hstate *h,
}
/* page migration callback function */
-struct page *alloc_huge_page_node(struct hstate *h, int nid)
-{
- gfp_t gfp_mask = htlb_alloc_mask(h);
- struct page *page = NULL;
-
- if (nid != NUMA_NO_NODE)
- gfp_mask |= __GFP_THISNODE;
-
- spin_lock(&hugetlb_lock);
- if (h->free_huge_pages - h->resv_huge_pages > 0)
- page = dequeue_huge_page_nodemask(h, gfp_mask, nid, NULL);
- spin_unlock(&hugetlb_lock);
-
- if (!page)
- page = alloc_migrate_huge_page(h, gfp_mask, nid, NULL);
-
- return page;
-}
-
-/* page migration callback function */
struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
- nodemask_t *nmask)
+ nodemask_t *nmask, gfp_t gfp_mask)
{
- gfp_t gfp_mask = htlb_alloc_mask(h);
-
spin_lock(&hugetlb_lock);
if (h->free_huge_pages - h->resv_huge_pages > 0) {
struct page *page;
@@ -2031,7 +2000,7 @@ struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
gfp_mask = htlb_alloc_mask(h);
node = huge_node(vma, address, gfp_mask, &mpol, &nodemask);
- page = alloc_huge_page_nodemask(h, node, nodemask);
+ page = alloc_huge_page_nodemask(h, node, nodemask, gfp_mask);
mpol_cond_put(mpol);
return page;
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index dabcee8..9034a53 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1068,10 +1068,12 @@ static int migrate_page_add(struct page *page, struct list_head *pagelist,
/* page allocation callback for NUMA node migration */
struct page *alloc_new_node_page(struct page *page, unsigned long node)
{
- if (PageHuge(page))
- return alloc_huge_page_node(page_hstate(compound_head(page)),
- node);
- else if (PageTransHuge(page)) {
+ if (PageHuge(page)) {
+ struct hstate *h = page_hstate(compound_head(page));
+ gfp_t gfp_mask = htlb_alloc_mask(h) | __GFP_THISNODE;
+
+ return alloc_huge_page_nodemask(h, node, NULL, gfp_mask);
+ } else if (PageTransHuge(page)) {
struct page *thp;
thp = alloc_pages_node(node,
diff --git a/mm/migrate.c b/mm/migrate.c
index 7370a66..3b3d918 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1538,10 +1538,13 @@ struct page *new_page_nodemask(struct page *page,
unsigned int order = 0;
struct page *new_page = NULL;
- if (PageHuge(page))
- return alloc_huge_page_nodemask(
- page_hstate(compound_head(page)),
- preferred_nid, nodemask);
+ if (PageHuge(page)) {
+ struct hstate *h = page_hstate(compound_head(page));
+
+ gfp_mask = htlb_alloc_mask(h);
+ return alloc_huge_page_nodemask(h, preferred_nid,
+ nodemask, gfp_mask);
+ }
if (PageTransHuge(page)) {
gfp_mask |= GFP_TRANSHUGE;
--
2.7.4