The patch titled
Subject: shmem: convert shmem_writepage() to use a folio throughout
has been added to the -mm mm-unstable branch. Its filename is
shmem-convert-shmem_writepage-to-use-a-folio-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_writepage-to-use-a-folio-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_writepage() to use a folio throughout
Date: Fri, 2 Sep 2022 20:46:02 +0100
Even though we will split any large folio that comes in, write the code to
handle large folios so as to not leave a trap for whoever tries to handle
large folios in the swap cache.
Link: https://lkml.kernel.org/r/20220902194653.1739778-7-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 47 ++++++++++++++++++++++++-----------------------
1 file changed, 24 insertions(+), 23 deletions(-)
--- a/mm/shmem.c~shmem-convert-shmem_writepage-to-use-a-folio-throughout
+++ a/mm/shmem.c
@@ -1328,17 +1328,18 @@ static int shmem_writepage(struct page *
* "force", drivers/gpu/drm/i915/gem/i915_gem_shmem.c gets huge pages,
* and its shmem_writeback() needs them to be split when swapping.
*/
- if (PageTransCompound(page)) {
+ if (folio_test_large(folio)) {
/* Ensure the subpages are still dirty */
- SetPageDirty(page);
+ folio_test_set_dirty(folio);
if (split_huge_page(page) < 0)
goto redirty;
- ClearPageDirty(page);
+ folio = page_folio(page);
+ folio_clear_dirty(folio);
}
- BUG_ON(!PageLocked(page));
- mapping = page->mapping;
- index = page->index;
+ BUG_ON(!folio_test_locked(folio));
+ mapping = folio->mapping;
+ index = folio->index;
inode = mapping->host;
info = SHMEM_I(inode);
if (info->flags & VM_LOCKED)
@@ -1361,15 +1362,15 @@ static int shmem_writepage(struct page *
/*
* This is somewhat ridiculous, but without plumbing a SWAP_MAP_FALLOC
* value into swapfile.c, the only way we can correctly account for a
- * fallocated page arriving here is now to initialize it and write it.
+ * fallocated folio arriving here is now to initialize it and write it.
*
- * That's okay for a page already fallocated earlier, but if we have
+ * That's okay for a folio already fallocated earlier, but if we have
* not yet completed the fallocation, then (a) we want to keep track
- * of this page in case we have to undo it, and (b) it may not be a
+ * of this folio in case we have to undo it, and (b) it may not be a
* good idea to continue anyway, once we're pushing into swap. So
- * reactivate the page, and let shmem_fallocate() quit when too many.
+ * reactivate the folio, and let shmem_fallocate() quit when too many.
*/
- if (!PageUptodate(page)) {
+ if (!folio_test_uptodate(folio)) {
if (inode->i_private) {
struct shmem_falloc *shmem_falloc;
spin_lock(&inode->i_lock);
@@ -1385,9 +1386,9 @@ static int shmem_writepage(struct page *
if (shmem_falloc)
goto redirty;
}
- clear_highpage(page);
- flush_dcache_page(page);
- SetPageUptodate(page);
+ folio_zero_range(folio, 0, folio_size(folio));
+ flush_dcache_folio(folio);
+ folio_mark_uptodate(folio);
}
swap = folio_alloc_swap(folio);
@@ -1396,7 +1397,7 @@ static int shmem_writepage(struct page *
/*
* Add inode to shmem_unuse()'s list of swapped-out inodes,
- * if it's not already there. Do it now before the page is
+ * if it's not already there. Do it now before the folio is
* moved to swap cache, when its pagelock no longer protects
* the inode from eviction. But don't unlock the mutex until
* we've incremented swapped, because shmem_unuse_inode() will
@@ -1406,7 +1407,7 @@ static int shmem_writepage(struct page *
if (list_empty(&info->swaplist))
list_add(&info->swaplist, &shmem_swaplist);
- if (add_to_swap_cache(page, swap,
+ if (add_to_swap_cache(&folio->page, swap,
__GFP_HIGH | __GFP_NOMEMALLOC | __GFP_NOWARN,
NULL) == 0) {
spin_lock_irq(&info->lock);
@@ -1415,21 +1416,21 @@ static int shmem_writepage(struct page *
spin_unlock_irq(&info->lock);
swap_shmem_alloc(swap);
- shmem_delete_from_page_cache(page, swp_to_radix_entry(swap));
+ shmem_delete_from_page_cache(&folio->page, swp_to_radix_entry(swap));
mutex_unlock(&shmem_swaplist_mutex);
- BUG_ON(page_mapped(page));
- swap_writepage(page, wbc);
+ BUG_ON(folio_mapped(folio));
+ swap_writepage(&folio->page, wbc);
return 0;
}
mutex_unlock(&shmem_swaplist_mutex);
- put_swap_page(page, swap);
+ put_swap_page(&folio->page, swap);
redirty:
- set_page_dirty(page);
+ folio_mark_dirty(folio);
if (wbc->for_reclaim)
- return AOP_WRITEPAGE_ACTIVATE; /* Return with page locked */
- unlock_page(page);
+ return AOP_WRITEPAGE_ACTIVATE; /* Return with folio locked */
+ folio_unlock(folio);
return 0;
}
_
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
