* [merged] mm-page_vma_mapped_walk-get-vma_address_end-earlier.patch removed from -mm tree
@ 2021-06-27 21:53 akpm
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From: akpm @ 2021-06-27 21:53 UTC (permalink / raw)
To: apopple, hughd, kirill.shutemov, mm-commits, peterx, rcampbell,
shy828301, stable, wangyugui, will, willy, ziy
The patch titled
Subject: mm: page_vma_mapped_walk(): get vma_address_end() earlier
has been removed from the -mm tree. Its filename was
mm-page_vma_mapped_walk-get-vma_address_end-earlier.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Hugh Dickins <hughd@google.com>
Subject: mm: page_vma_mapped_walk(): get vma_address_end() earlier
page_vma_mapped_walk() cleanup: get THP's vma_address_end() at the start,
rather than later at next_pte. It's a little unnecessary overhead on the
first call, but makes for a simpler loop in the following commit.
Link: https://lkml.kernel.org/r/4542b34d-862f-7cb4-bb22-e0df6ce830a2@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Wang Yugui <wangyugui@e16-tech.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/page_vma_mapped.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
--- a/mm/page_vma_mapped.c~mm-page_vma_mapped_walk-get-vma_address_end-earlier
+++ a/mm/page_vma_mapped.c
@@ -171,6 +171,15 @@ bool page_vma_mapped_walk(struct page_vm
return true;
}
+ /*
+ * Seek to next pte only makes sense for THP.
+ * But more important than that optimization, is to filter out
+ * any PageKsm page: whose page->index misleads vma_address()
+ * and vma_address_end() to disaster.
+ */
+ end = PageTransCompound(page) ?
+ vma_address_end(page, pvmw->vma) :
+ pvmw->address + PAGE_SIZE;
if (pvmw->pte)
goto next_pte;
restart:
@@ -238,10 +247,6 @@ this_pte:
if (check_pte(pvmw))
return true;
next_pte:
- /* Seek to next pte only makes sense for THP */
- if (!PageTransHuge(page))
- return not_found(pvmw);
- end = vma_address_end(page, pvmw->vma);
do {
pvmw->address += PAGE_SIZE;
if (pvmw->address >= end)
_
Patches currently in -mm which might be from hughd@google.com are
mm-thp-remap_page-is-only-needed-on-anonymous-thp.patch
mm-hwpoison_user_mappings-try_to_unmap-with-ttu_sync.patch
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2021-06-27 21:53 [merged] mm-page_vma_mapped_walk-get-vma_address_end-earlier.patch removed from -mm tree akpm
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