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650975d2b1
Currently when we are freeing mTHP folios from swap cache, we free then one by one and put each entry into swap slot cache. Slot cache is designed to reduce the overhead by batching the freeing, but mTHP swap entries are already continuous so they can be batch freed without it already, it saves litle overhead, or even increase overhead for larger mTHP. What's more, mTHP entries could stay in swap cache for a while. Contiguous swap entry is an rather rare resource so releasing them directly can help improve mTHP allocation success rate when under pressure. Link: https://lkml.kernel.org/r/20240730-swap-allocator-v5-5-cb9c148b9297@kernel.org Signed-off-by: Kairui Song <kasong@tencent.com> Reported-by: Barry Song <21cnbao@gmail.com> Acked-by: Barry Song <baohua@kernel.org> Cc: Chris Li <chrisl@kernel.org> Cc: "Huang, Ying" <ying.huang@intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Kalesh Singh <kaleshsingh@google.com> 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.