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If execlists's lite-restore is based on the common GEM context tag rather than the per-intel_context LRCA, then a context switch between two intel_contexts on the same engine derived from the same GEM context will perform a lite-restore instead of a full context switch. We can exploit this by poisoning the ringbuffer of the first context and trying to trick a simple RING_TAIL update (i.e. lite-restore) v2: Also check what happens if preempt ce[0] with ce[1] (both instances on the same engine from the same parent context) [Tvrtko] Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191002183459.26614-1-chris@chris-wilson.co.uk
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.