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Chris Wilson a7980a640c drm/i915: Apply a cond_resched() to the saturated signaler
If the engine is continually completing nops, we can saturate the
signaler and keep it working indefinitely. This angers the NMI watchdog!

A good example is to disable semaphores on snb and run igt/gem_exec_nop -
the parallel, multi-engine workloads are more than sufficient to hog the
CPU, preventing the system from even processing ICMP echo replies.

v2: Tvrtko dug into cond_resched() on x86 and found that it only
depended upon preempt_count and not tif_need_resched() - which means
that we would always call schedule() at that point.

Fixes: c81d46138d ("drm/i915: Convert trace-irq to the breadcrumb waiter")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170404120531.10737-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
2017-04-04 13:48:21 +01:00
arch Linux 4.11-rc4 2017-03-28 17:34:19 +10:00
block
certs
crypto
Documentation Linux 4.11-rc4 2017-03-28 17:34:19 +10:00
drivers drm/i915: Apply a cond_resched() to the saturated signaler 2017-04-04 13:48:21 +01:00
firmware
fs driver core fix for 4.11-rc4 2017-03-26 11:05:42 -07:00
include Linux 4.11-rc4 2017-03-28 17:34:19 +10:00
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kernel Linux 4.11-rc4 2017-03-28 17:34:19 +10:00
lib
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tools Linux 4.11-rc4 2017-03-28 17:34:19 +10:00
usr
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MAINTAINERS Linux 4.11-rc4 2017-03-28 17:34:19 +10:00
Makefile Linux 4.11-rc4 2017-03-26 14:15:16 -07:00
README

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.