From: <Peter.Enderborg@sony.com>
To: <rppt@kernel.org>
Cc: <linux-kernel@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
<sumit.semwal@linaro.org>, <christian.koenig@amd.com>,
<adobriyan@gmail.com>, <akpm@linux-foundation.org>,
<songmuchun@bytedance.com>, <guro@fb.com>, <shakeelb@google.com>,
<mhocko@suse.com>, <neilb@suse.de>, <samitolvanen@google.com>,
<linux-media@vger.kernel.org>, <dri-devel@lists.freedesktop.org>,
<linaro-mm-sig@lists.linaro.org>, <willy@infradead.org>
Subject: Re: [PATCH v5] dma-buf: Add DmaBufTotal counter in meminfo
Date: Tue, 20 Apr 2021 12:03:04 +0000 [thread overview]
Message-ID: <5603a2cd-c1f3-870e-8c22-d50c0d2a7053@sony.com> (raw)
In-Reply-To: <YH7AeqqNyNnY0Zi3@kernel.org>
On 4/20/21 1:52 PM, Mike Rapoport wrote:
> On Tue, Apr 20, 2021 at 10:45:21AM +0000, Peter.Enderborg@sony.com wrote:
>> On 4/20/21 11:41 AM, Mike Rapoport wrote:
>>> Hello Peter,
>>>
>>> On Tue, Apr 20, 2021 at 09:26:00AM +0000, Peter.Enderborg@sony.com wrote:
>>>> On 4/20/21 10:58 AM, Daniel Vetter wrote:
>>>>> On Sat, Apr 17, 2021 at 06:38:35PM +0200, Peter Enderborg wrote:
>>>>>> This adds a total used dma-buf memory. Details
>>>>>> can be found in debugfs, however it is not for everyone
>>>>>> and not always available. dma-buf are indirect allocated by
>>>>>> userspace. So with this value we can monitor and detect
>>>>>> userspace applications that have problems.
>>>>>>
>>>>>> Signed-off-by: Peter Enderborg <peter.enderborg@sony.com>
>>>>> So there have been tons of discussions around how to track dma-buf and
>>>>> why, and I really need to understand the use-cass here first I think. proc
>>>>> uapi is as much forever as anything else, and depending what you're doing
>>>>> this doesn't make any sense at all:
>>>>>
>>>>> - on most linux systems dma-buf are only instantiated for shared buffer.
>>>>> So there this gives you a fairly meaningless number and not anything
>>>>> reflecting gpu memory usage at all.
>>>>>
>>>>> - on Android all buffers are allocated through dma-buf afaik. But there
>>>>> we've recently had some discussions about how exactly we should track
>>>>> all this, and the conclusion was that most of this should be solved by
>>>>> cgroups long term. So if this is for Android, then I don't think adding
>>>>> random quick stop-gaps to upstream is a good idea (because it's a pretty
>>>>> long list of patches that have come up on this).
>>>>>
>>>>> So what is this for?
>>>> For the overview. dma-buf today only have debugfs for info. Debugfs
>>>> is not allowed by google to use in andoid. So this aggregate the information
>>>> so we can get information on what going on on the system.
>>>
>>> Can you send an example debugfs output to see what data are we talking
>>> about?
>> Sure. This is on a idle system. Im not sure why you need it.The problem is partly that debugfs is
>> not accessable on a commercial device.
> I wanted to see what kind of information is there, but I didn't think it's
> that long :)
Sorry, but it was making a point.
>
>> Dma-buf Objects:
>> size flags mode count exp_name buf name ino
>> 00032768 00000002 00080007 00000002 ion-system-1006-allocator-servi dmabuf17728 07400825 dmabuf17728
>> Attached Devices:
>> Total 0 devices attached
>>
>> 11083776 00000002 00080007 00000003 ion-system-1006-allocator-servi dmabuf17727 07400824 dmabuf17727
>> Attached Devices:
>> ae00000.qcom,mdss_mdp:qcom,smmu_sde_unsec_cb
>> Total 1 devices attached
>>
>> 00032768 00000002 00080007 00000002 ion-system-1006-allocator-servi dmabuf17726 07400823 dmabuf17726
>> Attached Devices:
>> Total 0 devices attached
>>
>> 11083776 00000002 00080007 00000002 ion-system-1006-allocator-servi dmabuf17725 07400822 dmabuf17725
>> Attached Devices:
>> ae00000.qcom,mdss_mdp:qcom,smmu_sde_unsec_cb
>> Total 1 devices attached
> ...
>
>> Total 654 objects, 744144896 bytes
>
> Isn't the size from the first column also available in fdinfo?
>
> Is there anything that prevents monitoring those?
>
Yes, selinux.
next prev parent reply other threads:[~2021-04-20 12:03 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-17 16:38 [PATCH v5] dma-buf: Add DmaBufTotal counter in meminfo Peter Enderborg
2021-04-20 8:58 ` Daniel Vetter
2021-04-20 9:26 ` Peter.Enderborg
2021-04-20 9:41 ` Mike Rapoport
2021-04-20 10:45 ` Peter.Enderborg
2021-04-20 11:52 ` Mike Rapoport
2021-04-20 12:03 ` Peter.Enderborg [this message]
2021-04-20 11:14 ` Daniel Vetter
2021-04-20 11:37 ` Peter.Enderborg
2021-04-21 9:15 ` Daniel Vetter
2021-04-21 10:37 ` Peter.Enderborg
2021-04-21 10:57 ` Michal Hocko
2021-04-21 13:05 ` Pekka Paalanen
2021-04-21 15:31 ` Mike Rapoport
2021-04-21 17:35 ` Peter.Enderborg
2021-04-22 8:06 ` Mike Rapoport
2021-04-22 14:08 ` Peter.Enderborg
2021-04-25 7:33 ` Mike Rapoport
2021-04-25 8:40 ` Peter.Enderborg
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