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We set the priority hint on execlists to avoid executing the tasklet for when we know that there will be no change in execution order. However, as we set it from the virtual engine for all siblings, but only one physical engine may respond, we leave the hint set on the others stopping direct submission that could take place. If we do not set the hint, we may attempt direct submission even if we don't expect to submit. If we set the hint, we may not do any submission until the tasklet is run (and sometimes we may park the engine before that has had a chance). Ergo there's only a minor ill-effect on mixed virtual/physical engine workloads where we may try and fail to do direct submission more often than required. (Pure virtual / engine workloads will have redundant tasklet execution suppressed as normal.) Closes: https://gitlab.freedesktop.org/drm/intel/issues/1522 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/20200325101358.12231-1-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.