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| author | Barry Song <v-songbaohua@oppo.com> | 2024-06-07 23:13:58 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-07-04 04:30:07 +0200 |
| commit | 20dfa5b7adc5a1f8b5b7ff9b014d0bd1845c990b (patch) | |
| tree | f44e68f410f5295568d4e30c2c344c264fa5cc5e /mm/memory.c | |
| parent | mm: introduce pmd|pte_needs_soft_dirty_wp helpers for softdirty write-protect (diff) | |
| download | linux-20dfa5b7adc5a1f8b5b7ff9b014d0bd1845c990b.tar.xz linux-20dfa5b7adc5a1f8b5b7ff9b014d0bd1845c990b.zip | |
mm: set pte writable while pte_soft_dirty() is true in do_swap_page()
This patch leverages the new pte_needs_soft_dirty_wp() helper to optimize
a scenario where softdirty is enabled, but the softdirty flag has already
been set in do_swap_page(). In this situation, we can use pte_mkwrite
instead of applying write-protection since we don't depend on write
faults.
Link: https://lkml.kernel.org/r/20240607211358.4660-3-21cnbao@gmail.com
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c index 44a81d737f1e..d8a0b7d2e15b 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4324,7 +4324,7 @@ check_folio: if (!folio_test_ksm(folio) && (exclusive || folio_ref_count(folio) == 1)) { if ((vma->vm_flags & VM_WRITE) && !userfaultfd_pte_wp(vma, pte) && - !vma_soft_dirty_enabled(vma)) { + !pte_needs_soft_dirty_wp(vma, pte)) { pte = pte_mkwrite(pte, vma); if (vmf->flags & FAULT_FLAG_WRITE) { pte = pte_mkdirty(pte); |