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Message-ID: <20140722111515.GJ15237@phenom.ffwll.local> Date: Tue, 22 Jul 2014 13:15:16 +0200 From: Daniel Vetter <daniel@...ll.ch> To: Oded Gabbay <oded.gabbay@....com> Cc: Daniel Vetter <daniel.vetter@...ll.ch>, 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 Tue, Jul 22, 2014 at 12:52:43PM +0300, Oded Gabbay wrote: > 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). Essentially yes. But we also have some hw features to kill jobs quicker, e.g. for media workloads. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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