FYI, we noticed the below changes on

commit 2a16fc93d2c9568e16d45db77c7b5f15e1921cf1 ("nohz: Avoid tick's double reprogramming in highres mode")


testbox/testcase/testparams: snb-drag/piglit/performance-igt-001

b5e995e671d8e4d7  2a16fc93d2c9568e16d45db77c  
----------------  --------------------------  
       fail:runs  %reproduction    fail:runs
           |             |             |    
           :5          100%           5:5     kmsg.drm:__gen6_gt_force_wake_get]*ERROR*Timed_out_waiting_for_forcewake_to_ack_request
           :5          100%           5:5     piglit.igt/gem_ctx_exec/reset-pin-leak.dmesg-warn

snb-drag: Sandy Bridge
Memory: 6G


<3>[   90.915459] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   90.925094] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   90.934725] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   90.944347] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   90.953956] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   90.963559] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   90.973173] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   90.982793] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   90.992405] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   91.002008] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   91.011618] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   91.021222] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   91.030825] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   91.040430] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   91.050016] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   91.059593] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.
<3>[   91.069152] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack request.


To reproduce:

	apt-get install ruby ruby-oj
	git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
	cd lkp-tests
	bin/setup-local job.yaml # the job file attached in this email
	bin/run-local   job.yaml


Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.


	--yliu