The patch titled
Subject: mm: memory: convert do_cow_fault to use folios
has been added to the -mm mm-unstable branch. Its filename is
mm-memory-convert-do_cow_fault-to-use-folios.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory-convert-do_cow_fault-to-use-folios.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Subject: mm: memory: convert do_cow_fault to use folios
Date: Thu, 12 Jan 2023 16:30:02 +0800
The page functions are converted to corresponding folio functions in
do_cow_fault().
Link: https://lkml.kernel.org/r/20230112083006.163393-4-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
--- a/mm/memory.c~mm-memory-convert-do_cow_fault-to-use-folios
+++ a/mm/memory.c
@@ -4507,22 +4507,24 @@ static vm_fault_t do_read_fault(struct v
static vm_fault_t do_cow_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
+ struct folio *cow_folio, *folio;
vm_fault_t ret;
if (unlikely(anon_vma_prepare(vma)))
return VM_FAULT_OOM;
- vmf->cow_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, vmf->address);
- if (!vmf->cow_page)
+ cow_folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0, vma, vmf->address,
+ false);
+ if (!cow_folio)
return VM_FAULT_OOM;
- if (mem_cgroup_charge(page_folio(vmf->cow_page), vma->vm_mm,
- GFP_KERNEL)) {
- put_page(vmf->cow_page);
+ if (mem_cgroup_charge(cow_folio, vma->vm_mm, GFP_KERNEL)) {
+ folio_put(cow_folio);
return VM_FAULT_OOM;
}
- cgroup_throttle_swaprate(vmf->cow_page, GFP_KERNEL);
+ folio_throttle_swaprate(cow_folio, GFP_KERNEL);
+ vmf->cow_page = &cow_folio->page;
ret = __do_fault(vmf);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
goto uncharge_out;
@@ -4530,16 +4532,17 @@ static vm_fault_t do_cow_fault(struct vm
return ret;
copy_user_highpage(vmf->cow_page, vmf->page, vmf->address, vma);
- __SetPageUptodate(vmf->cow_page);
+ __folio_mark_uptodate(cow_folio);
ret |= finish_fault(vmf);
- unlock_page(vmf->page);
- put_page(vmf->page);
+ folio = page_folio(vmf->page);
+ folio_unlock(folio);
+ folio_put(folio);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
goto uncharge_out;
return ret;
uncharge_out:
- put_page(vmf->cow_page);
+ folio_put(cow_folio);
return ret;
}
_
Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are
mm-hwposion-support-recovery-from-ksm_might_need_to_copy.patch
mm-hwposion-support-recovery-from-ksm_might_need_to_copy-v3.patch
mm-huge_memory-convert-madvise_free_huge_pmd-to-use-a-folio.patch
mm-swap-convert-mark_page_lazyfree-to-folio_mark_lazyfree.patch
mm-huge_memory-convert-split_huge_pages_all-to-use-a-folio.patch
mm-page_idle-convert-page-idle-to-use-a-folio.patch
mm-damon-introduce-damon_get_folio.patch
mm-damon-convert-damon_ptep-pmdp_mkold-to-use-a-folio.patch
mm-damon-paddr-convert-damon_pa_-to-use-a-folio.patch
mm-damon-vaddr-convert-damon_young_pmd_entry-to-use-a-folio.patch
mm-damon-remove-unneeded-damon_get_page.patch
mm-damon-vaddr-convert-hugetlb-related-functions-to-use-a-folio.patch
mm-madvise-use-vm_normal_folio-in-madvise_free_pte_range.patch
mm-huge_memory-make-__do_huge_pmd_anonymous_page-to-take-a-folio.patch
mm-memory-convert-do_anonymous_page-to-use-a-folio.patch
mm-memory-convert-do_cow_fault-to-use-folios.patch
mm-memory-convert-page_copy_prealloc-to-use-a-folio.patch
mm-memory-convert-wp_page_copy-to-use-folios.patch
mm-memory-use-folio_throttle_swaprate-in-do_swap_page.patch
mm-swap-remove-unneeded-cgroup_throttle_swaprate.patch
