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Usually we have no idea about the upper bound we need to wait to catch up with userspace when idling the device, but in a few situations we know the system was idle beforehand and can provide a short timeout in order to very quickly catch a failure, long before hangcheck kicks in. In the following patches, we will use the timeout to curtain two overly long waits, where we know we can expect the GPU to complete within a reasonable time or declare it broken. In particular, with a broken GPU we expect it to fail during the initial GPU setup where do a couple of context switches to record the defaults. This is a task that takes a few milliseconds even on the slowest of devices, but we may have to wait 60s for hangcheck to give in and declare the machine inoperable. In this a case where any gpu hang is unacceptable, both from a timeliness and practical standpoint. The other improvement is that in selftests, we do not need to arm an independent timer to inject a wedge, as we can just limit the timeout on the wait directly. v2: Include the timeout parameter in the trace. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180709122044.7028-1-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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.