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5861b013e2
When the system idles, we switch to the kernel context as a defensive measure (no users are harmed if the kernel context is lost). Currently, we issue a switch to kernel context and then come back later to see if the kernel context is still current and the system is idle. However, if we are no longer privy to the runqueue ordering, then we have to relax our assumptions about the logical state of the GPU and the only way to ensure that the kernel context is currently loaded is by issuing a request to run after all others, and wait for it to complete all while preventing anyone else from issuing their own requests. v2: Pull wedging into switch_to_kernel_context_sync() but only after waiting (though only for the same short delay) for the active context to finish. 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/20190308093657.8640-1-chris@chris-wilson.co.uk |
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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.