The quilt patch titled
Subject: mm: introduce arch_do_swap_page_nr() which allows restore metadata for nr pages
has been removed from the -mm tree. Its filename was
mm-introduce-arch_do_swap_page_nr-which-allows-restore-metadata-for-nr-pages.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Barry Song <v-songbaohua@xxxxxxxx>
Subject: mm: introduce arch_do_swap_page_nr() which allows restore metadata for nr pages
Date: Wed, 29 May 2024 20:28:22 +1200
Should do_swap_page() have the capability to directly map a large folio,
metadata restoration becomes necessary for a specified number of pages
denoted as nr. It's important to highlight that metadata restoration is
solely required by the SPARC platform, which, however, does not enable
THP_SWAP. Consequently, in the present kernel configuration, there exists
no practical scenario where users necessitate the restoration of nr
metadata. Platforms implementing THP_SWAP might invoke this function with
nr values exceeding 1, subsequent to do_swap_page() successfully mapping
an entire large folio. Nonetheless, their arch_do_swap_page_nr()
functions remain empty.
Link: https://lkml.kernel.org/r/20240529082824.150954-5-21cnbao@xxxxxxxxx
Signed-off-by: Barry Song <v-songbaohua@xxxxxxxx>
Reviewed-by: Ryan Roberts <ryan.roberts@xxxxxxx>
Reviewed-by: Khalid Aziz <khalid.aziz@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Andreas Larsson <andreas@xxxxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: Chris Li <chrisl@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Chuanhua Han <hanchuanhua@xxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Gao Xiang <xiang@xxxxxxxxxx>
Cc: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kairui Song <kasong@xxxxxxxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pgtable.h | 24 +++++++++++++++++++-----
mm/memory.c | 3 ++-
2 files changed, 21 insertions(+), 6 deletions(-)
--- a/include/linux/pgtable.h~mm-introduce-arch_do_swap_page_nr-which-allows-restore-metadata-for-nr-pages
+++ a/include/linux/pgtable.h
@@ -1089,6 +1089,15 @@ static inline int pgd_same(pgd_t pgd_a,
})
#ifndef __HAVE_ARCH_DO_SWAP_PAGE
+static inline void arch_do_swap_page_nr(struct mm_struct *mm,
+ struct vm_area_struct *vma,
+ unsigned long addr,
+ pte_t pte, pte_t oldpte,
+ int nr)
+{
+
+}
+#else
/*
* Some architectures support metadata associated with a page. When a
* page is being swapped out, this metadata must be saved so it can be
@@ -1097,12 +1106,17 @@ static inline int pgd_same(pgd_t pgd_a,
* page as metadata for the page. arch_do_swap_page() can restore this
* metadata when a page is swapped back in.
*/
-static inline void arch_do_swap_page(struct mm_struct *mm,
- struct vm_area_struct *vma,
- unsigned long addr,
- pte_t pte, pte_t oldpte)
+static inline void arch_do_swap_page_nr(struct mm_struct *mm,
+ struct vm_area_struct *vma,
+ unsigned long addr,
+ pte_t pte, pte_t oldpte,
+ int nr)
{
-
+ for (int i = 0; i < nr; i++) {
+ arch_do_swap_page(vma->vm_mm, vma, addr + i * PAGE_SIZE,
+ pte_advance_pfn(pte, i),
+ pte_advance_pfn(oldpte, i));
+ }
}
#endif
--- a/mm/memory.c~mm-introduce-arch_do_swap_page_nr-which-allows-restore-metadata-for-nr-pages
+++ a/mm/memory.c
@@ -4308,7 +4308,8 @@ vm_fault_t do_swap_page(struct vm_fault
VM_BUG_ON(!folio_test_anon(folio) ||
(pte_write(pte) && !PageAnonExclusive(page)));
set_pte_at(vma->vm_mm, vmf->address, vmf->pte, pte);
- arch_do_swap_page(vma->vm_mm, vma, vmf->address, pte, vmf->orig_pte);
+ arch_do_swap_page_nr(vma->vm_mm, vma, vmf->address,
+ pte, vmf->orig_pte, 1);
folio_unlock(folio);
if (folio != swapcache && swapcache) {
_
Patches currently in -mm which might be from v-songbaohua@xxxxxxxx are
mm-extend-rmap-flags-arguments-for-folio_add_new_anon_rmap.patch
mm-extend-rmap-flags-arguments-for-folio_add_new_anon_rmap-fix-2.patch
mm-extend-rmap-flags-arguments-for-folio_add_new_anon_rmap-fix-3.patch
mm-use-folio_add_new_anon_rmap-if-folio_test_anonfolio==false.patch
mm-use-folio_add_new_anon_rmap-if-folio_test_anonfolio==false-fix-2.patch
mm-remove-folio_test_anonfolio==false-path-in-__folio_add_anon_rmap.patch
tools-mm-introduce-a-tool-to-assess-swap-entry-allocation-for-thp_swapout.patch
