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If we have more than a few, possibly several thousand request in the queue, don't show the central portion, just the first few and the last being executed and/or queued. The first few should be enough to help identify a problem in execution, and most often comparing the first/last in the queue is enough to identify problems in the scheduling. We may need some fine tuning to set MAX_REQUESTS_TO_SHOW for common debug scenarios, but for the moment if we can avoiding spending more than a few seconds dumping the GPU state that will avoid a nasty livelock (where hangcheck spends so long dumping the state, it fires again and starts to dump the state again in parallel, ad infinitum). v2: Remember to print last not the stale rq iter after the loop. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180424081600.27544-1-chris@chris-wilson.co.uk |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.