From: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
To: Chris Wilson <chris@chris-wilson.co.uk>, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH] drm/i915: Use discardable buffers for rings
Date: Thu, 20 Apr 2017 13:22:28 +0300 [thread overview]
Message-ID: <1492683748.17161.23.camel@linux.intel.com> (raw)
In-Reply-To: <20170420101709.27250-1-chris@chris-wilson.co.uk>
On to, 2017-04-20 at 11:17 +0100, Chris Wilson wrote:
> The contents of a ring are only valid between HEAD and TAIL, when the
> ring is idle (HEAD == TAIL) we can simply let the pages go under memory
> pressue if they are not pinned by an active context. And new content
> will be written and so the ring will again be valid between HEAD and
> TAIL, everything outside can be discarded.
>
> Note that we take care of ensuring that we do not reset the HEAD
> backwards following a GPU hang on an idle ring.
>
> The same precautions are what enable us to use stolen memory for rings.
>
> 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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next prev parent reply other threads:[~2017-04-20 10:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-20 10:17 [PATCH] drm/i915: Use discardable buffers for rings Chris Wilson
2017-04-20 10:22 ` Joonas Lahtinen [this message]
2017-04-20 10:49 ` ✗ Fi.CI.BAT: failure for " Patchwork
2017-04-20 11:33 ` Chris Wilson
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