ea4b5b33bf
Patch series "page_owner: Fix refcount imbalance and print fixup", v4. This series consists of a refactoring/correctness of updating the metadata of tail pages, a couple of fixups for the refcounting part and a fixup for the stack_start() function. From this series on, instead of counting the stacks, we count the outstanding nr_base_pages each stack has, which gives us a much better memory overview. The other fixup is for the migration part. A more detailed explanation can be found in the changelog of the respective patches. This patch (of 4): __set_page_owner_handle() and __reset_page_owner() update the metadata of all pages when the page is of a higher-order, but we miss to do the same when the pages are migrated. __folio_copy_owner() only updates the metadata of the head page, meaning that the information stored in the first page and the tail pages will not match. Strictly speaking that is not a big problem because 1) we do not print tail pages and 2) upon splitting all tail pages will inherit the metadata of the head page, but it is better to have all metadata in check should there be any problem, so it can ease debugging. For that purpose, a couple of helpers are created __update_page_owner_handle() which updates the metadata on allocation, and __update_page_owner_free_handle() which does the same when the page is freed. __folio_copy_owner() will make use of both as it needs to entirely replace the page_owner metadata for the new page. Link: https://lkml.kernel.org/r/20240404070702.2744-1-osalvador@suse.de Link: https://lkml.kernel.org/r/20240404070702.2744-2-osalvador@suse.de Signed-off-by: Oscar Salvador <osalvador@suse.de> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Alexander Potapenko <glider@google.com> Cc: Alexandre Ghiti <alexghiti@rivosinc.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Marco Elver <elver@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Alexandre Ghiti <alexghiti@rivosinc.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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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.