From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: Eric Anholt <eric@anholt.net>, zhoucm1 <zhoucm1@amd.com>,
christian.koenig@amd.com,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2] drm: Revert syncobj timeline changes.
Date: Mon, 12 Nov 2018 11:16:01 +0100 [thread overview]
Message-ID: <199c35bc-e684-fbc4-dcef-d7105d82f0ff@gmail.com> (raw)
In-Reply-To: <87y3a1sx8t.fsf@anholt.net>
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Am 09.11.18 um 23:26 schrieb Eric Anholt:
> Eric Anholt <eric@anholt.net> writes:
>
>> [ Unknown signature status ]
>> zhoucm1 <zhoucm1@amd.com> writes:
>>
>>> On 2018年11月09日 00:52, Christian König wrote:
>>>> Am 08.11.18 um 17:07 schrieb Koenig, Christian:
>>>>> Am 08.11.18 um 17:04 schrieb Eric Anholt:
>>>>>> Daniel suggested I submit this, since we're still seeing regressions
>>>>>> from it. This is a revert to before 48197bc564c7 ("drm: add syncobj
>>>>>> timeline support v9") and its followon fixes.
>>>>> This is a harmless false positive from lockdep, Chouming and I are
>>>>> already working on a fix.
>>>> On the other hand we had enough trouble with that patch, so if it
>>>> really bothers you feel free to add my Acked-by: Christian König
>>>> <christian.koenig@amd.com> and push it.
>>> NAK, please no, I don't think this needed, the Warning totally isn't
>>> related to syncobj timeline, but fence-array implementation flaw, just
>>> exposed by syncobj.
>>> In addition, Christian already has a fix for this Warning, I've tested.
>>> Please Christian send to public review.
>> I backed out my revert of #2 (#1 still necessary) after adding the
>> lockdep regression fix, and now my CTS run got oomkilled after just a
>> few hours, with these notable lines in the unreclaimable slab info list:
>>
>> [ 6314.373099] drm_sched_fence 69095KB 69095KB
>> [ 6314.373653] kmemleak_object 428249KB 428384KB
>> [ 6314.373736] kmalloc-262144 256KB 256KB
>> [ 6314.373743] kmalloc-131072 128KB 128KB
>> [ 6314.373750] kmalloc-65536 64KB 64KB
>> [ 6314.373756] kmalloc-32768 1472KB 1728KB
>> [ 6314.373763] kmalloc-16384 64KB 64KB
>> [ 6314.373770] kmalloc-8192 208KB 208KB
>> [ 6314.373778] kmalloc-4096 2408KB 2408KB
>> [ 6314.373784] kmalloc-2048 288KB 336KB
>> [ 6314.373792] kmalloc-1024 1457KB 1512KB
>> [ 6314.373800] kmalloc-512 854KB 1048KB
>> [ 6314.373808] kmalloc-256 188KB 268KB
>> [ 6314.373817] kmalloc-192 69141KB 69142KB
>> [ 6314.373824] kmalloc-64 47703KB 47704KB
>> [ 6314.373886] kmalloc-128 46396KB 46396KB
>> [ 6314.373894] kmem_cache 31KB 35KB
>>
>> No results from kmemleak, though.
> OK, it looks like the #2 revert probably isn't related to the OOM issue.
> Running a single job on otherwise unused DRM, watching /proc/slabinfo
> every second for drm_sched_fence, I get:
>
> drm_sched_fence 0 0 192 21 1 : tunables 32 16 8 : slabdata 0 0 0 : globalstat 0 0 0 0 0 0 0 0 0 : cpustat 0 0 0 0
> drm_sched_fence 16 21 192 21 1 : tunables 32 16 8 : slabdata 1 1 0 : globalstat 16 16 1 0 0 0 0 0 0 : cpustat 5 1 6 0
> drm_sched_fence 13 21 192 21 1 : tunables 32 16 8 : slabdata 1 1 0 : globalstat 16 16 1 0 0 0 0 0 0 : cpustat 5 1 6 0
> drm_sched_fence 6 21 192 21 1 : tunables 32 16 8 : slabdata 1 1 0 : globalstat 16 16 1 0 0 0 0 0 0 : cpustat 5 1 6 0
> drm_sched_fence 4 21 192 21 1 : tunables 32 16 8 : slabdata 1 1 0 : globalstat 16 16 1 0 0 0 0 0 0 : cpustat 5 1 6 0
> drm_sched_fence 2 21 192 21 1 : tunables 32 16 8 : slabdata 1 1 0 : globalstat 16 16 1 0 0 0 0 0 0 : cpustat 5 1 6 0
> drm_sched_fence 0 21 192 21 1 : tunables 32 16 8 : slabdata 0 1 0 : globalstat 16 16 1 0 0 0 0 0 0 : cpustat 5 1 6 0
>
> So we generate a ton of fences, and I guess free them slowly because of
> RCU? And presumably kmemleak was sucking up lots of memory because of
> how many of these objects were laying around.
That is certainly possible. Another possibility is that we don't drop
the reference in dma-fence-array early enough.
E.g. the dma-fence-array will keep the reference to its fences until it
is destroyed, which is a bit late when you chain multiple
dma-fence-array objects together.
David can you take a look at this and propose a fix? That would probably
be good to have fixed in dma-fence-array separately to the timeline work.
Thanks,
Christian.
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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next prev parent reply other threads:[~2018-11-12 10:16 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-08 16:04 [PATCH 0/2] reverts to un-regress v3d Eric Anholt
2018-11-08 16:04 ` [PATCH 1/2] Revert "drm/sched: fix timeout handling v2" Eric Anholt
2018-11-08 16:04 ` Eric Anholt
2018-11-08 16:10 ` Koenig, Christian
2018-11-08 16:10 ` Koenig, Christian
2018-11-08 16:19 ` Eric Anholt
2018-11-08 16:19 ` Eric Anholt
2018-11-08 16:48 ` Koenig, Christian
2018-11-08 16:04 ` [PATCH 2/2] drm: Revert syncobj timeline changes Eric Anholt
2018-11-08 16:07 ` Koenig, Christian
2018-11-08 16:07 ` Koenig, Christian
2018-11-08 16:52 ` Christian König
2018-11-09 2:35 ` zhoucm1
2018-11-09 2:35 ` zhoucm1
2018-11-09 21:10 ` Eric Anholt
2018-11-09 21:10 ` Eric Anholt
2018-11-09 22:26 ` Eric Anholt
2018-11-09 22:26 ` Eric Anholt
2018-11-12 10:16 ` Christian König [this message]
2018-11-12 10:28 ` zhoucm1
2018-11-12 10:48 ` Chris Wilson
2018-11-12 11:47 ` Koenig, Christian
2018-11-12 11:47 ` Koenig, Christian
2018-11-13 5:57 ` zhoucm1
2018-11-13 5:57 ` zhoucm1
2018-11-13 6:18 ` zhoucm1
[not found] ` <84df39ac-e8a2-f0f5-6562-f2df25c110e8@amd.com>
[not found] ` <8736s4w31m.fsf@anholt.net>
[not found] ` <22b7eef1-cc13-5662-5656-d39aeb0c78e0@amd.com>
[not found] ` <87bm6rb0cy.fsf@anholt.net>
2018-11-15 18:47 ` Eric Anholt
2018-12-19 17:53 ` Dmitry Osipenko
2018-12-21 18:27 ` Christian König
2018-12-21 18:35 ` Dmitry Osipenko
2018-12-21 18:45 ` Koenig, Christian
2018-12-21 18:59 ` Dmitry Osipenko
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