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

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Message-ID: <53CE346B.1080601@amd.com>
Date:	Tue, 22 Jul 2014 12:52:43 +0300
From:	Oded Gabbay <oded.gabbay@....com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
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>,
	"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>, "Sellek, Tom" <Tom.Sellek@....com>
Subject: Re: [PATCH v2 00/25] AMDKFD kernel driver

On 22/07/14 12:21, Daniel Vetter wrote:
> 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
>
What do you mean by hang ? Like the tdr mechanism in Windows (checks if a gpu 
job takes more than 2 seconds, I think, and if so, terminates the job).

	Oded
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