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| Filename | Latest commit message | Latest commit date |
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7d0eb51dd9
Force bonded requests to run on distinct engines so that they cannot be shuffled onto the same engine where timeslicing will reverse the order. A bonded request will often wait on a semaphore signaled by its master, creating an implicit dependency -- if we ignore that implicit dependency and allow the bonded request to run on the same engine and before its master, we will cause a GPU hang. [Whether it will hang the GPU is debatable, we should keep on timeslicing and each timeslice should be "accidentally" counted as forward progress, in which case it should run but at one-half to one-third speed.] We can prevent this inversion by restricting which engines we allow ourselves to jump to upon preemption, i.e. baking in the arrangement established at first execution. (We should also consider capturing the implicit dependency using i915_sched_add_dependency(), but first we need to think about the constraints that requires on the execution/retirement ordering.) Fixes: |
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| README | ||
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.