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Enabling zswap support in the kernel configuration costs about 1.5MB of RAM, even when zswap is not enabled at runtime. This cost can be reduced significantly by deferring initialisation (including pool creation) until the "enabled" parameter is set to true. There is a small cost to this in that some initialisation code has to remain in memory after the init phase, just in case they are needed later, but the total size increase is negligible. See: https://github.com/raspberrypi/linux/pull/3432 Signed-off-by: Phil Elwell <phil@raspberrypi.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 Restructured Text 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.