The patch titled
Subject: mm: convert do_wp_page() to use a folio
has been added to the -mm mm-unstable branch. Its filename is
mm-convert-do_wp_page-to-use-a-folio.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-convert-do_wp_page-to-use-a-folio.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: mm: convert do_wp_page() to use a folio
Date: Fri, 2 Sep 2022 20:46:37 +0100
Saves many calls to compound_head().
Link: https://lkml.kernel.org/r/20220902194653.1739778-42-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 40 ++++++++++++++++++++--------------------
1 file changed, 20 insertions(+), 20 deletions(-)
--- a/mm/memory.c~mm-convert-do_wp_page-to-use-a-folio
+++ a/mm/memory.c
@@ -3370,6 +3370,7 @@ static vm_fault_t do_wp_page(struct vm_f
{
const bool unshare = vmf->flags & FAULT_FLAG_UNSHARE;
struct vm_area_struct *vma = vmf->vma;
+ struct folio *folio;
VM_BUG_ON(unshare && (vmf->flags & FAULT_FLAG_WRITE));
VM_BUG_ON(!unshare && !(vmf->flags & FAULT_FLAG_WRITE));
@@ -3416,48 +3417,47 @@ static vm_fault_t do_wp_page(struct vm_f
* Take out anonymous pages first, anonymous shared vmas are
* not dirty accountable.
*/
- if (PageAnon(vmf->page)) {
- struct page *page = vmf->page;
-
+ folio = page_folio(vmf->page);
+ if (folio_test_anon(folio)) {
/*
* If the page is exclusive to this process we must reuse the
* page without further checks.
*/
- if (PageAnonExclusive(page))
+ if (PageAnonExclusive(vmf->page))
goto reuse;
/*
- * We have to verify under page lock: these early checks are
- * just an optimization to avoid locking the page and freeing
+ * We have to verify under folio lock: these early checks are
+ * just an optimization to avoid locking the folio and freeing
* the swapcache if there is little hope that we can reuse.
*
- * PageKsm() doesn't necessarily raise the page refcount.
+ * KSM doesn't necessarily raise the folio refcount.
*/
- if (PageKsm(page) || page_count(page) > 3)
+ if (folio_test_ksm(folio) || folio_ref_count(folio) > 3)
goto copy;
- if (!PageLRU(page))
+ if (!folio_test_lru(folio))
/*
* Note: We cannot easily detect+handle references from
- * remote LRU pagevecs or references to PageLRU() pages.
+ * remote LRU pagevecs or references to LRU folios.
*/
lru_add_drain();
- if (page_count(page) > 1 + PageSwapCache(page))
+ if (folio_ref_count(folio) > 1 + folio_test_swapcache(folio))
goto copy;
- if (!trylock_page(page))
+ if (!folio_trylock(folio))
goto copy;
- if (PageSwapCache(page))
- try_to_free_swap(page);
- if (PageKsm(page) || page_count(page) != 1) {
- unlock_page(page);
+ if (folio_test_swapcache(folio))
+ folio_free_swap(folio);
+ if (folio_test_ksm(folio) || folio_ref_count(folio) != 1) {
+ folio_unlock(folio);
goto copy;
}
/*
- * Ok, we've got the only page reference from our mapping
- * and the page is locked, it's dark out, and we're wearing
+ * Ok, we've got the only folio reference from our mapping
+ * and the folio is locked, it's dark out, and we're wearing
* sunglasses. Hit it.
*/
- page_move_anon_rmap(page, vma);
- unlock_page(page);
+ page_move_anon_rmap(vmf->page, vma);
+ folio_unlock(folio);
reuse:
if (unlikely(unshare)) {
pte_unmap_unlock(vmf->pte, vmf->ptl);
_
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
