From: Chris Wilson <chris@chris-wilson.co.uk>
To: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 5/6] drm/i915: Use ktime to calculate rc0 residency
Date: Wed, 15 Mar 2017 15:57:38 +0000 [thread overview]
Message-ID: <20170315155738.GF2118@nuc-i3427.alporthouse.com> (raw)
In-Reply-To: <1489592584-10422-5-git-send-email-mika.kuoppala@intel.com>
On Wed, Mar 15, 2017 at 05:43:03PM +0200, Mika Kuoppala wrote:
> We have used cz timestamp register to gain a reference time wrt
> to residency calculations. The residency counts are in cz clk ticks
> (333Mhz clock) but for some reason the cz timestamp register gives
> 100us units. Perhaps for some other usage, the base-ten based values
> are easier, but in residency calculations raw units would have been
> the easiest.
>
> As there is not much advantage of using base-ten clock through
> a more costly punit access, take our reference times directly from
> kernel clock.
>
> v2: use ktime (Chris, Ville)
>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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next prev parent reply other threads:[~2017-03-15 15:58 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-15 15:42 [PATCH 1/6] drm/i915: Move residency calculation into intel_pm.c Mika Kuoppala
2017-03-15 15:43 ` [PATCH 2/6] drm/i915: Return residency as microseconds Mika Kuoppala
2017-03-15 15:58 ` Chris Wilson
2017-03-15 15:43 ` [PATCH 3/6] drm/i915: Extend vlv/chv residency resolution Mika Kuoppala
2017-03-15 15:52 ` Chris Wilson
2017-03-15 16:07 ` Mika Kuoppala
2017-03-15 15:43 ` [PATCH 4/6] drm/i915: Convert debugfs to use generic residency calculator Mika Kuoppala
2017-03-15 15:56 ` Chris Wilson
2017-03-15 15:43 ` [PATCH 5/6] drm/i915: Use ktime to calculate rc0 residency Mika Kuoppala
2017-03-15 15:57 ` Chris Wilson [this message]
2017-03-15 15:43 ` [PATCH 6/6] drm/i915: Use coarse grained residency counter with byt Mika Kuoppala
2017-03-15 15:56 ` Chris Wilson
2017-03-15 16:12 ` Mika Kuoppala
2017-03-15 15:58 ` [PATCH 1/6] drm/i915: Move residency calculation into intel_pm.c Chris Wilson
2017-03-16 10:52 ` Mika Kuoppala
2017-03-15 17:50 ` ✓ Fi.CI.BAT: success for series starting with [1/6] drm/i915: Move residency calculation into intel_pm.c (rev3) Patchwork
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