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d60fcaf00d
Khugepaged already supports collapsing file large folios (including shmem mTHP) by commit7de856ffd0("mm: khugepaged: support shmem mTHP collapse"), and the control parameters in khugepaged: 'khugepaged_max_ptes_swap' and 'khugepaged_max_ptes_none', still compare based on PTE granularity to determine whether a file collapse is needed. However, the statistics for 'present' and 'swap' in hpage_collapse_scan_file() do not take into account the large folios, which may lead to incorrect judgments regarding the khugepaged_max_ptes_swap/none parameters, resulting in unnecessary file collapses. To fix this issue, take into account the large folios' statistics for 'present' and 'swap' variables in the hpage_collapse_scan_file(). Link: https://lkml.kernel.org/r/c76305d96d12d030a1a346b50503d148364246d2.1728901391.git.baolin.wang@linux.alibaba.com Fixes:7de856ffd0("mm: khugepaged: support shmem mTHP collapse") Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com> Acked-by: David Hildenbrand <david@redhat.com> Reviewed-by: Barry Song <baohua@kernel.org> Reviewed-by: Zi Yan <ziy@nvidia.com> Reviewed-by: Yang Shi <shy828301@gmail.com> Cc: Hugh Dickins <hughd@google.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Ryan Roberts <ryan.roberts@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.