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While the pages can't be swapped out, they can be discarded by the shrinker. Normally such objects are marked with __I915_MADV_PURGED, which can't be unset, and therefore requires a new object. For kernel internal objects this is not true, since the madv hint is reset for our special volatile objects, such that we can re-acquire new pages, if so desired, without needing a new object. As a result we should probably be paranoid here and put the object back into the CPU domain when discarding the pages, and also correctly set cache_dirty, if required. Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211018174508.2137279-8-matthew.auld@intel.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.