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Linux kernel source tree
1f2052755c
Introduce a mincore_swap helper for checking swap entries. Move all swap related logic and sanity debug check into it, and separate them from page cache checking. The performance is better after this commit. mincore_page is never called on a swap cache space now, so the logic can be simpler. The sanity check also covers more potential cases now, previously the WARN_ON only catches potentially corrupted page table, now if shmem contains a swap entry with !CONFIG_SWAP, a WARN will be triggered. This changes the mincore value when the WARN is triggered, but this shouldn't matter. The WARN_ON means the data is already corrupted or something is very wrong, so it really should not happen. Before this series: mincore on a swaped out 16G anon mmap range: Took 488220 us mincore on 16G shmem mmap range: Took 530272 us. After this commit: mincore on a swaped out 16G anon mmap range: Took 446763 us mincore on 16G shmem mmap range: Took 460496 us. About ~10% faster. Link: https://lkml.kernel.org/r/20250811172018.48901-3-ryncsn@gmail.com Signed-off-by: Kairui Song <kasong@tencent.com> Cc: Baoquan He <bhe@redhat.com> Cc: Barry Song <baohua@kernel.org> Cc: Chris Li <chrisl@kernel.org> Cc: David Hildenbrand <david@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jann Horn <jannh@google.com> Cc: Kemeng Shi <shikemeng@huaweicloud.com> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Nhat Pham <nphamcs@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
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| net | ||
| rust | ||
| samples | ||
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| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
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| .gitattributes | ||
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| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
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| Kbuild | ||
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| README | ||
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.