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a38425935f
There was reported performance degradation when the shadow map contained too many entries [1]. The shadow map uses 256-bucket hash with linear lists - when there are too many entries, it has quadratic complexity. Meir Elisha proposed to add a module parameter that could configure the size of the hash array - however, this is not ideal because users don't know that they should increase the parameter when they get bad performance. This commit replaces the linear lists with rb-trees (so that there's a hash of rb-trees), they have logarithmic complexity, so it solves the performance degradation. Link: https://patchwork.kernel.org/project/dm-devel/patch/20241014134944.1264991-1-meir.elisha@volumez.com/ [1] Reported-by: Meir Elisha <meir.elisha@volumez.com> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
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.