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Add zswap_never_enabled() to skip the xarray lookup in zswap_load() if zswap was never enabled on the system. It is implemented using static branches for efficiency, as enabling zswap should be a rare event. This could shave some cycles off zswap_load() when CONFIG_ZSWAP is used but zswap is never enabled. However, the real motivation behind this patch is two-fold: - Incoming large folio swapin work will need to fallback to order-0 folios if zswap was ever enabled, because any part of the folio could be in zswap, until proper handling of large folios with zswap is added. - A warning and recovery attempt will be added in a following change in case the above was not done incorrectly. Zswap will fail the read if the folio is large and it was ever enabled. Expose zswap_never_enabled() in the header for the swapin work to use it later. [yosryahmed@google.com: expose zswap_never_enabled() in the header] Link: https://lkml.kernel.org/r/Zmjf0Dr8s9xSW41X@google.com Link: https://lkml.kernel.org/r/20240611024516.1375191-2-yosryahmed@google.com Signed-off-by: Yosry Ahmed <yosryahmed@google.com> Reviewed-by: Nhat Pham <nphamcs@gmail.com> Cc: Barry Song <baohua@kernel.org> Cc: Chengming Zhou <chengming.zhou@linux.dev> Cc: Chris Li <chrisl@kernel.org> Cc: David Hildenbrand <david@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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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.