[v2 1/1] hugetlb_vmemmap: use folio argument for hugetlb_vmemmap_* functions

From: Usama Arif
Date: Wed Oct 11 2023 - 10:46:35 EST

Most function calls in hugetlb.c are made with folio arguments.
This brings hugetlb_vmemmap calls inline with them by using folio
instead of head struct page. Head struct page is still needed
within these functions.

The set/clear/test functions for hugepages are also changed to
folio versions.

Signed-off-by: Usama Arif <usama.arif@xxxxxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
---
mm/hugetlb.c | 14 ++++++-------
mm/hugetlb_vmemmap.c | 50 +++++++++++++++++++++++---------------------
mm/hugetlb_vmemmap.h | 8 +++----
3 files changed, 37 insertions(+), 35 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 29231f1c49a8..f5fc039c7342 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1603,10 +1603,10 @@ static void __update_and_free_hugetlb_folio(struct hstate *h,

/*
* If folio is not vmemmap optimized (!clear_dtor), then the folio
- * is no longer identified as a hugetlb page. hugetlb_vmemmap_restore
+ * is no longer identified as a hugetlb page. hugetlb_vmemmap_restore_folio
* can only be passed hugetlb pages and will BUG otherwise.
*/
- if (clear_dtor && hugetlb_vmemmap_restore(h, &folio->page)) {
+ if (clear_dtor && hugetlb_vmemmap_restore_folio(h, folio)) {
spin_lock_irq(&hugetlb_lock);
/*
* If we cannot allocate vmemmap pages, just refuse to free the
@@ -1749,7 +1749,7 @@ static void bulk_vmemmap_restore_error(struct hstate *h,
* quit processing the list to retry the bulk operation.
*/
list_for_each_entry_safe(folio, t_folio, folio_list, lru)
- if (hugetlb_vmemmap_restore(h, &folio->page)) {
+ if (hugetlb_vmemmap_restore_folio(h, folio)) {
list_del(&folio->lru);
spin_lock_irq(&hugetlb_lock);
add_hugetlb_folio(h, folio, true);
@@ -1906,7 +1906,7 @@ static void init_new_hugetlb_folio(struct hstate *h, struct folio *folio)
static void __prep_new_hugetlb_folio(struct hstate *h, struct folio *folio)
{
init_new_hugetlb_folio(h, folio);
- hugetlb_vmemmap_optimize(h, &folio->page);
+ hugetlb_vmemmap_optimize_folio(h, folio);
}

static void prep_new_hugetlb_folio(struct hstate *h, struct folio *folio, int nid)
@@ -2312,7 +2312,7 @@ int dissolve_free_huge_page(struct page *page)
* Attempt to allocate vmemmmap here so that we can take
* appropriate action on failure.
*/
- rc = hugetlb_vmemmap_restore(h, &folio->page);
+ rc = hugetlb_vmemmap_restore_folio(h, folio);
if (!rc) {
update_and_free_hugetlb_folio(h, folio, false);
} else {
@@ -3697,11 +3697,11 @@ static int demote_free_hugetlb_folio(struct hstate *h, struct folio *folio)
/*
* If vmemmap already existed for folio, the remove routine above would
* have cleared the hugetlb folio flag. Hence the folio is technically
- * no longer a hugetlb folio. hugetlb_vmemmap_restore can only be
+ * no longer a hugetlb folio. hugetlb_vmemmap_restore_folio can only be
* passed hugetlb folios and will BUG otherwise.
*/
if (folio_test_hugetlb(folio)) {
- rc = hugetlb_vmemmap_restore(h, &folio->page);
+ rc = hugetlb_vmemmap_restore_folio(h, folio);
if (rc) {
/* Allocation of vmemmmap failed, we can not demote folio */
spin_lock_irq(&hugetlb_lock);
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index d2999c303031..87818ee7f01d 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -495,14 +495,15 @@ EXPORT_SYMBOL(hugetlb_optimize_vmemmap_key);
static bool vmemmap_optimize_enabled = IS_ENABLED(CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON);
core_param(hugetlb_free_vmemmap, vmemmap_optimize_enabled, bool, 0);

-static int __hugetlb_vmemmap_restore(const struct hstate *h, struct page *head, unsigned long flags)
+static int __hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio, unsigned long flags)
{
int ret;
+ struct page *head = &folio->page;
unsigned long vmemmap_start = (unsigned long)head, vmemmap_end;
unsigned long vmemmap_reuse;

VM_WARN_ON_ONCE(!PageHuge(head));
- if (!HPageVmemmapOptimized(head))
+ if (!folio_test_hugetlb_vmemmap_optimized(folio))
return 0;

vmemmap_end = vmemmap_start + hugetlb_vmemmap_size(h);
@@ -518,7 +519,7 @@ static int __hugetlb_vmemmap_restore(const struct hstate *h, struct page *head,
*/
ret = vmemmap_remap_alloc(vmemmap_start, vmemmap_end, vmemmap_reuse, flags);
if (!ret) {
- ClearHPageVmemmapOptimized(head);
+ folio_clear_hugetlb_vmemmap_optimized(folio);
static_branch_dec(&hugetlb_optimize_vmemmap_key);
}

@@ -526,18 +527,18 @@ static int __hugetlb_vmemmap_restore(const struct hstate *h, struct page *head,
}

/**
- * hugetlb_vmemmap_restore - restore previously optimized (by
- * hugetlb_vmemmap_optimize()) vmemmap pages which
+ * hugetlb_vmemmap_restore_folio - restore previously optimized (by
+ * hugetlb_vmemmap_optimize_folio()) vmemmap pages which
* will be reallocated and remapped.
* @h: struct hstate.
- * @head: the head page whose vmemmap pages will be restored.
+ * @folio: the folio whose vmemmap pages will be restored.
*
- * Return: %0 if @head's vmemmap pages have been reallocated and remapped,
+ * Return: %0 if @folio's vmemmap pages have been reallocated and remapped,
* negative error code otherwise.
*/
-int hugetlb_vmemmap_restore(const struct hstate *h, struct page *head)
+int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio)
{
- return __hugetlb_vmemmap_restore(h, head, 0);
+ return __hugetlb_vmemmap_restore_folio(h, folio, 0);
}

/**
@@ -563,7 +564,7 @@ long hugetlb_vmemmap_restore_folios(const struct hstate *h,

list_for_each_entry_safe(folio, t_folio, folio_list, lru) {
if (folio_test_hugetlb_vmemmap_optimized(folio)) {
- ret = __hugetlb_vmemmap_restore(h, &folio->page,
+ ret = __hugetlb_vmemmap_restore_folio(h, folio,
VMEMMAP_REMAP_NO_TLB_FLUSH);
if (ret)
break;
@@ -640,12 +641,13 @@ static bool vmemmap_should_optimize(const struct hstate *h, const struct page *h
return true;
}

-static int __hugetlb_vmemmap_optimize(const struct hstate *h,
- struct page *head,
+static int __hugetlb_vmemmap_optimize_folio(const struct hstate *h,
+ struct folio *folio,
struct list_head *vmemmap_pages,
unsigned long flags)
{
int ret = 0;
+ struct page *head = &folio->page;
unsigned long vmemmap_start = (unsigned long)head, vmemmap_end;
unsigned long vmemmap_reuse;

@@ -665,7 +667,7 @@ static int __hugetlb_vmemmap_optimize(const struct hstate *h,
* If there is an error during optimization, we will immediately FLUSH
* the TLB and clear the flag below.
*/
- SetHPageVmemmapOptimized(head);
+ folio_set_hugetlb_vmemmap_optimized(folio);

vmemmap_end = vmemmap_start + hugetlb_vmemmap_size(h);
vmemmap_reuse = vmemmap_start;
@@ -681,27 +683,27 @@ static int __hugetlb_vmemmap_optimize(const struct hstate *h,
vmemmap_pages, flags);
if (ret) {
static_branch_dec(&hugetlb_optimize_vmemmap_key);
- ClearHPageVmemmapOptimized(head);
+ folio_clear_hugetlb_vmemmap_optimized(folio);
}

return ret;
}

/**
- * hugetlb_vmemmap_optimize - optimize @head page's vmemmap pages.
+ * hugetlb_vmemmap_optimize_folio - optimize @folio's vmemmap pages.
* @h: struct hstate.
- * @head: the head page whose vmemmap pages will be optimized.
+ * @folio: the folio whose vmemmap pages will be optimized.
*
- * This function only tries to optimize @head's vmemmap pages and does not
+ * This function only tries to optimize @folio's vmemmap pages and does not
* guarantee that the optimization will succeed after it returns. The caller
- * can use HPageVmemmapOptimized(@head) to detect if @head's vmemmap pages
- * have been optimized.
+ * can use folio_test_hugetlb_vmemmap_optimized(@folio) to detect if @folio's
+ * vmemmap pages have been optimized.
*/
-void hugetlb_vmemmap_optimize(const struct hstate *h, struct page *head)
+void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio)
{
LIST_HEAD(vmemmap_pages);

- __hugetlb_vmemmap_optimize(h, head, &vmemmap_pages, 0);
+ __hugetlb_vmemmap_optimize_folio(h, folio, &vmemmap_pages, 0);
free_vmemmap_page_list(&vmemmap_pages);
}

@@ -745,7 +747,7 @@ void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_l
flush_tlb_all();

list_for_each_entry(folio, folio_list, lru) {
- int ret = __hugetlb_vmemmap_optimize(h, &folio->page,
+ int ret = __hugetlb_vmemmap_optimize_folio(h, folio,
&vmemmap_pages,
VMEMMAP_REMAP_NO_TLB_FLUSH);

@@ -754,14 +756,14 @@ void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_l
* encounter an ENOMEM, free what we have and try again.
* This can occur in the case that both spliting fails
* halfway and head page allocation also failed. In this
- * case __hugetlb_vmemmap_optimize() would free memory
+ * case __hugetlb_vmemmap_optimize_folio() would free memory
* allowing more vmemmap remaps to occur.
*/
if (ret == -ENOMEM && !list_empty(&vmemmap_pages)) {
flush_tlb_all();
free_vmemmap_page_list(&vmemmap_pages);
INIT_LIST_HEAD(&vmemmap_pages);
- __hugetlb_vmemmap_optimize(h, &folio->page,
+ __hugetlb_vmemmap_optimize_folio(h, folio,
&vmemmap_pages,
VMEMMAP_REMAP_NO_TLB_FLUSH);
}
diff --git a/mm/hugetlb_vmemmap.h b/mm/hugetlb_vmemmap.h
index a0dcf49f46ba..9fd0cb270502 100644
--- a/mm/hugetlb_vmemmap.h
+++ b/mm/hugetlb_vmemmap.h
@@ -18,11 +18,11 @@
#define HUGETLB_VMEMMAP_RESERVE_PAGES (HUGETLB_VMEMMAP_RESERVE_SIZE / sizeof(struct page))

#ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
-int hugetlb_vmemmap_restore(const struct hstate *h, struct page *head);
+int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio);
long hugetlb_vmemmap_restore_folios(const struct hstate *h,
struct list_head *folio_list,
struct list_head *non_hvo_folios);
-void hugetlb_vmemmap_optimize(const struct hstate *h, struct page *head);
+void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio);
void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_list);

static inline unsigned int hugetlb_vmemmap_size(const struct hstate *h)
@@ -43,7 +43,7 @@ static inline unsigned int hugetlb_vmemmap_optimizable_size(const struct hstate
return size > 0 ? size : 0;
}
#else
-static inline int hugetlb_vmemmap_restore(const struct hstate *h, struct page *head)
+static inline int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio)
{
return 0;
}
@@ -56,7 +56,7 @@ static long hugetlb_vmemmap_restore_folios(const struct hstate *h,
return 0;
}

-static inline void hugetlb_vmemmap_optimize(const struct hstate *h, struct page *head)
+static inline void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio)
{
}

--
2.25.1