The patch titled
Subject: shmem: convert shmem_replace_page() to use folios throughout
has been added to the -mm mm-unstable branch. Its filename is
shmem-convert-shmem_replace_page-to-use-folios-throughout.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/shmem-convert-shmem_replace_page-to-use-folios-throughout.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: shmem: convert shmem_replace_page() to use folios throughout
Date: Fri, 2 Sep 2022 20:46:04 +0100
Introduce folio_set_swap_entry() to abstract how both folio->private and
swp_entry_t work. Use swap_address_space() directly instead of
indirecting through folio_mapping(). Include an assertion that the old
folio is not large as we only allocate a single-page folio to replace it.
Use folio_put_refs() instead of calling folio_put() twice.
Link: https://lkml.kernel.org/r/20220902194653.1739778-9-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/swap.h | 5 ++
mm/shmem.c | 69 +++++++++++++++++++----------------------
2 files changed, 38 insertions(+), 36 deletions(-)
--- a/include/linux/swap.h~shmem-convert-shmem_replace_page-to-use-folios-throughout
+++ a/include/linux/swap.h
@@ -355,6 +355,11 @@ static inline swp_entry_t folio_swap_ent
return entry;
}
+static inline void folio_set_swap_entry(struct folio *folio, swp_entry_t entry)
+{
+ folio->private = (void *)entry.val;
+}
+
/* linux/mm/workingset.c */
void workingset_age_nonresident(struct lruvec *lruvec, unsigned long nr_pages);
void *workingset_eviction(struct folio *folio, struct mem_cgroup *target_memcg);
--- a/mm/shmem.c~shmem-convert-shmem_replace_page-to-use-folios-throughout
+++ a/mm/shmem.c
@@ -1560,12 +1560,6 @@ static struct folio *shmem_alloc_folio(g
return folio;
}
-static struct page *shmem_alloc_page(gfp_t gfp,
- struct shmem_inode_info *info, pgoff_t index)
-{
- return &shmem_alloc_folio(gfp, info, index)->page;
-}
-
static struct folio *shmem_alloc_and_acct_folio(gfp_t gfp, struct inode *inode,
pgoff_t index, bool huge)
{
@@ -1617,51 +1611,49 @@ static bool shmem_should_replace_folio(s
static int shmem_replace_page(struct page **pagep, gfp_t gfp,
struct shmem_inode_info *info, pgoff_t index)
{
- struct page *oldpage, *newpage;
struct folio *old, *new;
struct address_space *swap_mapping;
swp_entry_t entry;
pgoff_t swap_index;
int error;
- oldpage = *pagep;
- entry.val = page_private(oldpage);
+ old = page_folio(*pagep);
+ entry = folio_swap_entry(old);
swap_index = swp_offset(entry);
- swap_mapping = page_mapping(oldpage);
+ swap_mapping = swap_address_space(entry);
/*
* We have arrived here because our zones are constrained, so don't
* limit chance of success by further cpuset and node constraints.
*/
gfp &= ~GFP_CONSTRAINT_MASK;
- newpage = shmem_alloc_page(gfp, info, index);
- if (!newpage)
+ VM_BUG_ON_FOLIO(folio_test_large(old), old);
+ new = shmem_alloc_folio(gfp, info, index);
+ if (!new)
return -ENOMEM;
- get_page(newpage);
- copy_highpage(newpage, oldpage);
- flush_dcache_page(newpage);
-
- __SetPageLocked(newpage);
- __SetPageSwapBacked(newpage);
- SetPageUptodate(newpage);
- set_page_private(newpage, entry.val);
- SetPageSwapCache(newpage);
+ folio_get(new);
+ folio_copy(new, old);
+ flush_dcache_folio(new);
+
+ __folio_set_locked(new);
+ __folio_set_swapbacked(new);
+ folio_mark_uptodate(new);
+ folio_set_swap_entry(new, entry);
+ folio_set_swapcache(new);
/*
* Our caller will very soon move newpage out of swapcache, but it's
* a nice clean interface for us to replace oldpage by newpage there.
*/
xa_lock_irq(&swap_mapping->i_pages);
- error = shmem_replace_entry(swap_mapping, swap_index, oldpage, newpage);
+ error = shmem_replace_entry(swap_mapping, swap_index, old, new);
if (!error) {
- old = page_folio(oldpage);
- new = page_folio(newpage);
mem_cgroup_migrate(old, new);
- __inc_lruvec_page_state(newpage, NR_FILE_PAGES);
- __inc_lruvec_page_state(newpage, NR_SHMEM);
- __dec_lruvec_page_state(oldpage, NR_FILE_PAGES);
- __dec_lruvec_page_state(oldpage, NR_SHMEM);
+ __lruvec_stat_mod_folio(new, NR_FILE_PAGES, 1);
+ __lruvec_stat_mod_folio(new, NR_SHMEM, 1);
+ __lruvec_stat_mod_folio(old, NR_FILE_PAGES, -1);
+ __lruvec_stat_mod_folio(old, NR_SHMEM, -1);
}
xa_unlock_irq(&swap_mapping->i_pages);
@@ -1671,18 +1663,17 @@ static int shmem_replace_page(struct pag
* both PageSwapCache and page_private after getting page lock;
* but be defensive. Reverse old to newpage for clear and free.
*/
- oldpage = newpage;
+ old = new;
} else {
- lru_cache_add(newpage);
- *pagep = newpage;
+ folio_add_lru(new);
+ *pagep = &new->page;
}
- ClearPageSwapCache(oldpage);
- set_page_private(oldpage, 0);
+ folio_clear_swapcache(old);
+ old->private = NULL;
- unlock_page(oldpage);
- put_page(oldpage);
- put_page(oldpage);
+ folio_unlock(old);
+ folio_put_refs(old, 2);
return error;
}
@@ -2383,6 +2374,12 @@ static struct inode *shmem_get_inode(str
}
#ifdef CONFIG_USERFAULTFD
+static struct page *shmem_alloc_page(gfp_t gfp,
+ struct shmem_inode_info *info, pgoff_t index)
+{
+ return &shmem_alloc_folio(gfp, info, index)->page;
+}
+
int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
pmd_t *dst_pmd,
struct vm_area_struct *dst_vma,
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
tools-fix-compilation-after-gfp_typesh-split.patch
mm-fix-vm_bug_on-in-__delete_from_swap_cache.patch
vmscan-check-folio_test_private-not-folio_get_private.patch
support-highmem-pages-in-vmap_pages_range_noflush.patch
mm-add-vma-iterator.patch
mmap-use-the-vma-iterator-in-count_vma_pages_range.patch
proc-remove-vma-rbtree-use-from-nommu.patch
arm64-remove-mmap-linked-list-from-vdso.patch
parisc-remove-mmap-linked-list-from-cache-handling.patch
powerpc-remove-mmap-linked-list-walks.patch
s390-remove-vma-linked-list-walks.patch
x86-remove-vma-linked-list-walks.patch
xtensa-remove-vma-linked-list-walks.patch
cxl-remove-vma-linked-list-walk.patch
optee-remove-vma-linked-list-walk.patch
um-remove-vma-linked-list-walk.patch
coredump-remove-vma-linked-list-walk.patch
exec-use-vma-iterator-instead-of-linked-list.patch
fs-proc-task_mmu-stop-using-linked-list-and-highest_vm_end.patch
acct-use-vma-iterator-instead-of-linked-list.patch
perf-use-vma-iterator.patch
sched-use-maple-tree-iterator-to-walk-vmas.patch
fork-use-vma-iterator.patch
mm-khugepaged-stop-using-vma-linked-list.patch
mm-ksm-use-vma-iterators-instead-of-vma-linked-list.patch
mm-mlock-use-vma-iterator-and-maple-state-instead-of-vma-linked-list.patch
mm-pagewalk-use-vma_find-instead-of-vma-linked-list.patch
i915-use-the-vma-iterator.patch
nommu-remove-uses-of-vma-linked-list.patch
mm-vmscan-fix-a-lot-of-comments.patch
mm-add-the-first-tail-page-to-struct-folio.patch
mm-reimplement-folio_order-and-folio_nr_pages.patch
mm-add-split_folio.patch
mm-add-folio_add_lru_vma.patch
shmem-convert-shmem_writepage-to-use-a-folio-throughout.patch
shmem-convert-shmem_delete_from_page_cache-to-take-a-folio.patch
shmem-convert-shmem_replace_page-to-use-folios-throughout.patch
mm-swapfile-remove-page_swapcount.patch
mm-swapfile-convert-try_to_free_swap-to-folio_free_swap.patch
mm-swap-convert-__read_swap_cache_async-to-use-a-folio.patch
mm-swap-convert-add_to_swap_cache-to-take-a-folio.patch
mm-swap-convert-put_swap_page-to-put_swap_folio.patch
mm-convert-do_swap_page-to-use-a-folio.patch
mm-convert-do_swap_pages-swapcache-variable-to-a-folio.patch
memcg-convert-mem_cgroup_swapin_charge_page-to-mem_cgroup_swapin_charge_folio.patch
shmem-convert-shmem_mfill_atomic_pte-to-use-a-folio.patch
shmem-convert-shmem_replace_page-to-shmem_replace_folio.patch
swap-add-swap_cache_get_folio.patch
shmem-eliminate-struct-page-from-shmem_swapin_folio.patch
shmem-convert-shmem_getpage_gfp-to-shmem_get_folio_gfp.patch
shmem-convert-shmem_fault-to-use-shmem_get_folio_gfp.patch
shmem-convert-shmem_read_mapping_page_gfp-to-use-shmem_get_folio_gfp.patch
shmem-add-shmem_get_folio.patch
shmem-convert-shmem_get_partial_folio-to-use-shmem_get_folio.patch
shmem-convert-shmem_write_begin-to-use-shmem_get_folio.patch
shmem-convert-shmem_file_read_iter-to-use-shmem_get_folio.patch
shmem-convert-shmem_fallocate-to-use-a-folio.patch
shmem-convert-shmem_symlink-to-use-a-folio.patch
shmem-convert-shmem_get_link-to-use-a-folio.patch
khugepaged-call-shmem_get_folio.patch
userfaultfd-convert-mcontinue_atomic_pte-to-use-a-folio.patch
shmem-remove-shmem_getpage.patch
swapfile-convert-try_to_unuse-to-use-a-folio.patch
swapfile-convert-__try_to_reclaim_swap-to-use-a-folio.patch
swapfile-convert-unuse_pte_range-to-use-a-folio.patch
mm-convert-do_swap_page-to-use-swap_cache_get_folio.patch
mm-remove-lookup_swap_cache.patch
swap_state-convert-free_swap_cache-to-use-a-folio.patch
swap-convert-swap_writepage-to-use-a-folio.patch
mm-convert-do_wp_page-to-use-a-folio.patch
huge_memory-convert-do_huge_pmd_wp_page-to-use-a-folio.patch
madvise-convert-madvise_free_pte_range-to-use-a-folio.patch
uprobes-use-folios-more-widely-in-__replace_page.patch
ksm-use-a-folio-in-replace_page.patch
mm-convert-do_swap_page-to-use-folio_free_swap.patch
memcg-convert-mem_cgroup_swap_full-to-take-a-folio.patch
mm-remove-try_to_free_swap.patch
rmap-convert-page_move_anon_rmap-to-use-a-folio.patch
migrate-convert-__unmap_and_move-to-use-folios.patch
migrate-convert-unmap_and_move_huge_page-to-use-folios.patch
huge_memory-convert-split_huge_page_to_list-to-use-a-folio.patch
huge_memory-convert-unmap_page-to-unmap_folio.patch
mm-convert-page_get_anon_vma-to-folio_get_anon_vma.patch
rmap-remove-page_unlock_anon_vma_read.patch
uprobes-use-new_folio-in-__replace_page.patch
mm-convert-lock_page_or_retry-to-folio_lock_or_retry.patch
