The patch titled
Subject: mm: rework swap handling of zap_pte_range
has been added to the -mm tree. Its filename is
mm-rework-swap-handling-of-zap_pte_range.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-rework-swap-handling-of-zap_pte_range.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-rework-swap-handling-of-zap_pte_range.patch
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------------------------------------------------------
From: Peter Xu <peterx@xxxxxxxxxx>
Subject: mm: rework swap handling of zap_pte_range
Clean the code up by merging the device private/exclusive swap entry
handling with the rest, then we merge the pte clear operation too.
struct* page is defined in multiple places in the function, move it upward.
free_swap_and_cache() is only useful for !non_swap_entry() case, put it
into the condition.
No functional change intended.
Link: https://lkml.kernel.org/r/20220216094810.60572-5-peterx@xxxxxxxxxx
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: "Kirill A . Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)
--- a/mm/memory.c~mm-rework-swap-handling-of-zap_pte_range
+++ a/mm/memory.c
@@ -1361,6 +1361,8 @@ again:
arch_enter_lazy_mmu_mode();
do {
pte_t ptent = *pte;
+ struct page *page;
+
if (pte_none(ptent))
continue;
@@ -1368,8 +1370,6 @@ again:
break;
if (pte_present(ptent)) {
- struct page *page;
-
page = vm_normal_page(vma, addr, ptent);
if (unlikely(!should_zap_page(details, page)))
continue;
@@ -1403,21 +1403,14 @@ again:
entry = pte_to_swp_entry(ptent);
if (is_device_private_entry(entry) ||
is_device_exclusive_entry(entry)) {
- struct page *page = pfn_swap_entry_to_page(entry);
-
+ page = pfn_swap_entry_to_page(entry);
if (unlikely(!should_zap_page(details, page)))
continue;
- pte_clear_not_present_full(mm, addr, pte, tlb->fullmm);
rss[mm_counter(page)]--;
-
if (is_device_private_entry(entry))
page_remove_rmap(page, false);
-
put_page(page);
- continue;
- }
-
- if (!non_swap_entry(entry)) {
+ } else if (!non_swap_entry(entry)) {
/*
* If this is a genuine swap entry, then it must be an
* private anon page. If the caller wants to skip
@@ -1426,9 +1419,9 @@ again:
if (!should_zap_cows(details))
continue;
rss[MM_SWAPENTS]--;
+ if (unlikely(!free_swap_and_cache(entry)))
+ print_bad_pte(vma, addr, ptent, NULL);
} else if (is_migration_entry(entry)) {
- struct page *page;
-
page = pfn_swap_entry_to_page(entry);
if (!should_zap_page(details, page))
continue;
@@ -1441,8 +1434,6 @@ again:
/* We should have covered all the swap entry types */
WARN_ON_ONCE(1);
}
- if (unlikely(!free_swap_and_cache(entry)))
- print_bad_pte(vma, addr, ptent, NULL);
pte_clear_not_present_full(mm, addr, pte, tlb->fullmm);
} while (pte++, addr += PAGE_SIZE, addr != end);
_
Patches currently in -mm which might be from peterx@xxxxxxxxxx are
mm-fix-invalid-page-pointer-returned-with-foll_pin-gups.patch
mm-dont-skip-swap-entry-even-if-zap_details-specified.patch
mm-rename-zap_skip_check_mapping-to-should_zap_page.patch
mm-change-zap_detailszap_mapping-into-even_cows.patch
mm-rework-swap-handling-of-zap_pte_range.patch
