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Rather than guessing how much space it might be safe to use for the DRC, simply try allocating slots and be prepared to accept failure. The first slot for each session is allocated with GFP_KERNEL which is unlikely to fail. Subsequent slots are allocated with the addition of __GFP_NORETRY which is expected to fail if there isn't much free memory. This is probably too aggressive but clears the way for adding a shrinker interface to free extra slots when memory is tight. Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Chuck Lever <chuck.lever@oracle.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.