linux-kernel - Re: [PATCH v2 00/25] AMDKFD kernel driver

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Message-ID: <CAKMK7uH+okhn4YGOzrXZ1LM3S2myxdu=_63LGMduwV-WZn06CA@mail.gmail.com>
Date:	Tue, 22 Jul 2014 11:21:12 +0200
From:	Daniel Vetter <daniel.vetter@...ll.ch>
To:	Oded Gabbay <oded.gabbay@....com>
Cc:	Jerome Glisse <j.glisse@...il.com>,
	Christian König <deathsimple@...afone.de>,
	David Airlie <airlied@...ux.ie>,
	Alex Deucher <alexdeucher@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Bridgman <John.Bridgman@....com>,
	Joerg Roedel <joro@...tes.org>,
	Andrew Lewycky <Andrew.Lewycky@....com>,
	Michel Dänzer <michel.daenzer@....com>,
	Ben Goz <Ben.Goz@....com>,
	Alexey Skidanov <Alexey.Skidanov@....com>,
	Evgeny Pinchuk <Evgeny.Pinchuk@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH v2 00/25] AMDKFD kernel driver

On Tue, Jul 22, 2014 at 10:19 AM, Oded Gabbay <oded.gabbay@....com> wrote:
>> Exactly, just prevent userspace from submitting more. And if you have
>> misbehaving userspace that submits too much, reset the gpu and tell it
>> that you're sorry but won't schedule any more work.
>
> I'm not sure how you intend to know if a userspace misbehaves or not. Can
> you elaborate ?

Well that's mostly policy, currently in i915 we only have a check for
hangs, and if userspace hangs a bit too often then we stop it. I guess
you can do that with the queue unmapping you've describe in reply to
Jerome's mail.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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