From: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
To: Chris Wilson <chris@chris-wilson.co.uk>, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 1/3] drm/i915: Stop marking the unaccessible scratch page as UC
Date: Mon, 22 Aug 2016 12:34:13 +0300 [thread overview]
Message-ID: <1471858453.3601.3.camel@linux.intel.com> (raw)
In-Reply-To: <20160822074431.26872-1-chris@chris-wilson.co.uk>
On ma, 2016-08-22 at 08:44 +0100, Chris Wilson wrote:
> Since by design, if not entirely by practice, nothing is allowed to
> access the scratch page we use to background fill the VM, then we do not
> need to ensure that it is coherent between the CPU and GPU.
> set_pages_uc() does a stop_machine() after changing the PAT, and that
> significantly impacts upon context creation throughput.
>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Regards, Joonas
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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prev parent reply other threads:[~2016-08-22 9:34 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-22 7:44 [PATCH 1/3] drm/i915: Stop marking the unaccessible scratch page as UC Chris Wilson
2016-08-22 7:44 ` [PATCH 2/3] drm/i915: Embed the scratch page struct into each VM Chris Wilson
2016-08-22 10:21 ` Joonas Lahtinen
2016-08-22 11:01 ` Mika Kuoppala
2016-08-22 7:44 ` [PATCH 3/3] drm/i915: Allow DMA pagetables to use highmem Chris Wilson
2016-08-22 11:04 ` Joonas Lahtinen
2016-08-22 8:39 ` ✗ Ro.CI.BAT: failure for series starting with [1/3] drm/i915: Stop marking the unaccessible scratch page as UC Patchwork
2016-08-22 9:34 ` Joonas Lahtinen [this message]
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