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de2939388b
io_uring does account any registered buffer as pinned/locked memory, and checks limit and fails if the given user doesn't have a big enough limit to register the ranges specified. However, if huge pages are used, we are potentially under-accounting the memory in terms of what gets pinned on the vm side. This patch rectifies that, by ensuring that we account the full size of a compound page, regardless of how much of it is being registered. Huge pages are not accounted mulitple times - if multiple sections of a huge page is registered, then the page is only accounted once. Reported-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.