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Matcher size is dynamic: it starts at initial size, and then it grows through rehash as more and more rules are added to this matcher. When rules are deleted, matcher's size is not decreased. Rehash approach is greedy. The idea is: if the matcher got to a certain size at some point, chances are - it will get to this size again, so it is better to avoid costly rehash operations whenever possible. However, when all the rules of the matcher are deleted, this should be viewed as special case. If the matcher actually got to the point where it has zero rules, it might be an indication that some usecase from the past is no longer happening. This is where some ICM can be freed. This patch handles this case: when a number of rules in a matcher goes down to zero, the matcher's tables are shrunk to the initial size. Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com> Reviewed-by: Vlad Dogaru <vdogaru@nvidia.com> Signed-off-by: Mark Bloch <mbloch@nvidia.com> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20250703185431.445571-10-mbloch@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.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.