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From: Heinrich Fink <heinrich.fink@daqri.com>
To: intel-gfx@lists.freedesktop.org
Subject: Tracing PM-triggered GPU frequency changes from user space
Date: Tue, 14 Nov 2017 13:19:28 +0100	[thread overview]
Message-ID: <1510661968.7526.23.camel@daqri.com> (raw)

Hi,

is there a simple way for user space to trace PM-triggered changes of
GPU frequency on GEN9/Skylake? 

i915:intel_gpu_freq_change seems to only report SW-triggered frequency
change requests. The best option I currently see is to poll
gt_act_freq_mhz, but I was hoping for a more elegant solution.

Use-case: I am using GPUVis to understand problematic workloads of some
applications, and it would be useful to have the actual GPU freq
showing up in that trace along with the rest.

I found an old email thread [0] on this topic from 2012, but it's not
clear to me what eventually turned out to be the outcome of that
discussion.

Thanks,

Heinrich

[0] https://lists.freedesktop.org/archives/intel-gfx/2012-September/thr
ead.html#19951

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             reply	other threads:[~2017-11-14 12:19 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-14 12:19 Heinrich Fink [this message]
2017-11-14 12:23 ` Tracing PM-triggered GPU frequency changes from user space Chris Wilson
2017-11-14 17:18   ` Heinrich Fink
2017-11-14 17:32     ` Chris Wilson

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