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mm/migrate: Convert remove_migration_ptes() to folios 

Convert the implementation and all callers.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-01-28 23:32:59 -05:00
parent 0d2514859c
commit 4eecb8b916
4 changed files with 54 additions and 42 deletions
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2
include/linux/rmap.h
View File

@ -261,7 +261,7 @@ unsigned long page_address_in_vma(struct page *, struct vm_area_struct *);
*/
int folio_mkclean(struct folio *);
void remove_migration_ptes(struct page *old, struct page *new, bool locked);
void remove_migration_ptes(struct folio *src, struct folio *dst, bool locked);
/*
* Called by memory-failure.c to kill processes.

24
mm/huge_memory.c
View File

@ -2270,18 +2270,19 @@ static void unmap_page(struct page *page)
VM_WARN_ON_ONCE_PAGE(page_mapped(page), page);
}
static void remap_page(struct page *page, unsigned int nr)
static void remap_page(struct folio *folio, unsigned long nr)
{
int i;
int i = 0;
/* If unmap_page() uses try_to_migrate() on file, remove this check */
if (!PageAnon(page))
if (!folio_test_anon(folio))
return;
if (PageTransHuge(page)) {
remove_migration_ptes(page, page, true);
} else {
for (i = 0; i < nr; i++)
remove_migration_ptes(page + i, page + i, true);
for (;;) {
remove_migration_ptes(folio, folio, true);
i += folio_nr_pages(folio);
if (i >= nr)
break;
folio = folio_next(folio);
}
}
@ -2441,7 +2442,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
}
local_irq_enable();
remap_page(head, nr);
remap_page(folio, nr);
if (PageSwapCache(head)) {
swp_entry_t entry = { .val = page_private(head) };
@ -2550,7 +2551,8 @@ bool can_split_huge_page(struct page *page, int *pextra_pins)
*/
int split_huge_page_to_list(struct page *page, struct list_head *list)
{
struct page *head = compound_head(page);
struct folio *folio = page_folio(page);
struct page *head = &folio->page;
struct deferred_split *ds_queue = get_deferred_split_queue(head);
XA_STATE(xas, &head->mapping->i_pages, head->index);
struct anon_vma *anon_vma = NULL;
@ -2667,7 +2669,7 @@ fail:
if (mapping)
xas_unlock(&xas);
local_irq_enable();
remap_page(head, thp_nr_pages(head));
remap_page(folio, folio_nr_pages(folio));
ret = -EBUSY;
}

55
mm/migrate.c
View File

@ -174,30 +174,32 @@ void putback_movable_pages(struct list_head *l)
static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
unsigned long addr, void *old)
{
DEFINE_PAGE_VMA_WALK(pvmw, (struct page *)old, vma, addr,
PVMW_SYNC | PVMW_MIGRATION);
struct page *new;
pte_t pte;
swp_entry_t entry;
struct folio *folio = page_folio(page);
DEFINE_FOLIO_VMA_WALK(pvmw, old, vma, addr, PVMW_SYNC | PVMW_MIGRATION);
VM_BUG_ON_PAGE(PageTail(page), page);
while (page_vma_mapped_walk(&pvmw)) {
if (PageKsm(page))
new = page;
else
new = page - pvmw.pgoff +
linear_page_index(vma, pvmw.address);
pte_t pte;
swp_entry_t entry;
struct page *new;
unsigned long idx = 0;
/* pgoff is invalid for ksm pages, but they are never large */
if (folio_test_large(folio) && !folio_test_hugetlb(folio))
idx = linear_page_index(vma, pvmw.address) - pvmw.pgoff;
new = folio_page(folio, idx);
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
/* PMD-mapped THP migration entry */
if (!pvmw.pte) {
VM_BUG_ON_PAGE(PageHuge(page) || !PageTransCompound(page), page);
VM_BUG_ON_FOLIO(folio_test_hugetlb(folio) ||
!folio_test_pmd_mappable(folio), folio);
remove_migration_pmd(&pvmw, new);
continue;
}
#endif
get_page(new);
folio_get(folio);
pte = pte_mkold(mk_pte(new, READ_ONCE(vma->vm_page_prot)));
if (pte_swp_soft_dirty(*pvmw.pte))
pte = pte_mksoft_dirty(pte);
@ -226,12 +228,12 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
}
#ifdef CONFIG_HUGETLB_PAGE
if (PageHuge(new)) {
if (folio_test_hugetlb(folio)) {
unsigned int shift = huge_page_shift(hstate_vma(vma));
pte = pte_mkhuge(pte);
pte = arch_make_huge_pte(pte, shift, vma->vm_flags);
if (PageAnon(new))
if (folio_test_anon(folio))
hugepage_add_anon_rmap(new, vma, pvmw.address);
else
page_dup_rmap(new, true);
@ -239,7 +241,7 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
} else
#endif
{
if (PageAnon(new))
if (folio_test_anon(folio))
page_add_anon_rmap(new, vma, pvmw.address, false);
else
page_add_file_rmap(new, vma, false);
@ -259,17 +261,17 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
* Get rid of all migration entries and replace them by
* references to the indicated page.
*/
void remove_migration_ptes(struct page *old, struct page *new, bool locked)
void remove_migration_ptes(struct folio *src, struct folio *dst, bool locked)
{
struct rmap_walk_control rwc = {
.rmap_one = remove_migration_pte,
.arg = old,
.arg = src,
};
if (locked)
rmap_walk_locked(new, &rwc);
rmap_walk_locked(&dst->page, &rwc);
else
rmap_walk(new, &rwc);
rmap_walk(&dst->page, &rwc);
}
/*
@ -756,6 +758,7 @@ int buffer_migrate_page_norefs(struct address_space *mapping,
*/
static int writeout(struct address_space *mapping, struct page *page)
{
struct folio *folio = page_folio(page);
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE,
.nr_to_write = 1,
@ -781,7 +784,7 @@ static int writeout(struct address_space *mapping, struct page *page)
* At this point we know that the migration attempt cannot
* be successful.
*/
remove_migration_ptes(page, page, false);
remove_migration_ptes(folio, folio, false);
rc = mapping->a_ops->writepage(page, &wbc);
@ -913,6 +916,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
int force, enum migrate_mode mode)
{
struct folio *folio = page_folio(page);
struct folio *dst = page_folio(newpage);
int rc = -EAGAIN;
bool page_was_mapped = false;
struct anon_vma *anon_vma = NULL;
@ -1039,8 +1043,8 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
}
if (page_was_mapped)
remove_migration_ptes(page,
rc == MIGRATEPAGE_SUCCESS ? newpage : page, false);
remove_migration_ptes(folio,
rc == MIGRATEPAGE_SUCCESS ? dst : folio, false);
out_unlock_both:
unlock_page(newpage);
@ -1166,7 +1170,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
enum migrate_mode mode, int reason,
struct list_head *ret)
{
struct folio *src = page_folio(hpage);
struct folio *dst, *src = page_folio(hpage);
int rc = -EAGAIN;
int page_was_mapped = 0;
struct page *new_hpage;
@ -1194,6 +1198,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
new_hpage = get_new_page(hpage, private);
if (!new_hpage)
return -ENOMEM;
dst = page_folio(new_hpage);
if (!trylock_page(hpage)) {
if (!force)
@ -1254,8 +1259,8 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
rc = move_to_new_page(new_hpage, hpage, mode);
if (page_was_mapped)
remove_migration_ptes(hpage,
rc == MIGRATEPAGE_SUCCESS ? new_hpage : hpage, false);
remove_migration_ptes(src,
rc == MIGRATEPAGE_SUCCESS ? dst : src, false);
unlock_put_anon:
unlock_page(new_hpage);

15
mm/migrate_device.c
View File

@ -376,15 +376,17 @@ static void migrate_vma_unmap(struct migrate_vma *migrate)
for (i = 0; i < npages && restore; i++) {
struct page *page = migrate_pfn_to_page(migrate->src[i]);
struct folio *folio;
if (!page || (migrate->src[i] & MIGRATE_PFN_MIGRATE))
continue;
remove_migration_ptes(page, page, false);
folio = page_folio(page);
remove_migration_ptes(folio, folio, false);
migrate->src[i] = 0;
unlock_page(page);
put_page(page);
folio_unlock(folio);
folio_put(folio);
restore--;
}
}
@ -729,6 +731,7 @@ void migrate_vma_finalize(struct migrate_vma *migrate)
unsigned long i;
for (i = 0; i < npages; i++) {
struct folio *dst, *src;
struct page *newpage = migrate_pfn_to_page(migrate->dst[i]);
struct page *page = migrate_pfn_to_page(migrate->src[i]);
@ -748,8 +751,10 @@ void migrate_vma_finalize(struct migrate_vma *migrate)
newpage = page;
}
remove_migration_ptes(page, newpage, false);
unlock_page(page);
src = page_folio(page);
dst = page_folio(newpage);
remove_migration_ptes(src, dst, false);
folio_unlock(src);
if (is_zone_device_page(page))
put_page(page);