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19773df031
finish_fault() uses per-page fault for file folios. This only occurs for file folios smaller than PMD_SIZE. The comment suggests that this approach prevents RSS inflation. However, it only prevents RSS accounting. The folio is still mapped to the process, and the fact that it is mapped by a single PTE does not affect memory pressure. Additionally, the kernel's ability to map large folios as PMD if they are large enough does not support this argument. When possible, map large folios in one shot. This reduces the number of minor page faults and allows for TLB coalescing. Mapping large folios at once will allow the rmap code to mlock it on add, as it will recognize that it is fully mapped and mlocking is safe. Link: https://lkml.kernel.org/r/20250923110711.690639-5-kirill@shutemov.name Signed-off-by: Kiryl Shutsemau <kas@kernel.org> Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: David Hildenbrand <david@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.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.