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Tue, 20 Apr 2021 08:00:16 +0000 Subject: Re: [PATCH v4] dma-buf: Add DmaBufTotal counter in meminfo To: Michal Hocko Cc: Peter.Enderborg@sony.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, sumit.semwal@linaro.org, adobriyan@gmail.com, akpm@linux-foundation.org, songmuchun@bytedance.com, guro@fb.com, shakeelb@google.com, neilb@suse.de, samitolvanen@google.com, rppt@kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, willy@infradead.org References: <20210417104032.5521-1-peter.enderborg@sony.com> <23aa041b-0e7c-6f82-5655-836899973d66@sony.com> <07ed1421-89f8-8845-b254-21730207c185@amd.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <2d0e3c44-832b-f297-90da-e2c3280eff32@amd.com> Date: Tue, 20 Apr 2021 10:00:07 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Originating-IP: [2a02:908:1252:fb60:3caf:a441:2498:1468] X-ClientProxiedBy: FR0P281CA0055.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:49::15) To MN2PR12MB3775.namprd12.prod.outlook.com (2603:10b6:208:159::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2a02:908:1252:fb60:3caf:a441:2498:1468] (2a02:908:1252:fb60:3caf:a441:2498:1468) by FR0P281CA0055.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:49::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4065.6 via Frontend Transport; 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Let's say that some user consumes unexpectedly >>> large amount of dma-buf on a certain node. This can lead to observable >>> performance impact on anybody on allocating from that node and even >>> worse cause an OOM for node bound consumers. How do I find out that it >>> was dma-buf that has caused the problem? >> Yes, that is the direction my thinking goes as well, but also even further. >> >> See DMA-buf is also used to share device local memory between processes as >> well. In other words VRAM on graphics hardware. >> >> On my test system here I have 32GB of system memory and 16GB of VRAM. I can >> use DMA-buf to allocate that 16GB of VRAM quite easily which then shows up >> under /proc/meminfo as used memory. > This is something that would be really interesting in the changelog. I > mean the expected and extreme memory consumption of this memory. Ideally > with some hints on what to do when the number is really high (e.g. mount > debugfs and have a look here and there to check whether this is just too > many users or an unexpected pattern to be reported). > >> But that isn't really system memory at all, it's just allocated device >> memory. > OK, that was not really clear to me. So this is not really accounted to > MemTotal? It depends. In a lot of embedded systems you only have system memory and in this case that value here is indeed really useful. > If that is really the case then reporting it into the oom > report is completely pointless and I am not even sure /proc/meminfo is > the right interface either. It would just add more confusion I am > afraid. I kind of agree. As I said a DMA-buf could be backed by system memory or device memory. In the case when it is backed by system memory it does make sense to report this in an OOM dump. But only the exporting driver knows what the DMA-buf handle represents, the framework just provides the common ground for inter driver communication. >>> See where I am heading? >> Yeah, totally. Thanks for pointing this out. >> >> Suggestions how to handle that? > As I've pointed out in previous reply we do have an API to account per > node memory but now that you have brought up that this is not something > we account as a regular memory then this doesn't really fit into that > model. But maybe I am just confused. Well does that API also has a counter for memory used by device drivers? If yes then the device driver who exported the DMA-buf should probably use that API. If no we might want to create one. I mean the author of this patch seems to have an use case where this is needed and I also see that we have some hole in how we account memory. Christian. 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charset="utf-8"; Format="flowed" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" QW0gMjAuMDQuMjEgdW0gMDk6NDYgc2NocmllYiBNaWNoYWwgSG9ja286Cj4gT24gVHVlIDIwLTA0 LTIxIDA5OjMyOjE0LCBDaHJpc3RpYW4gS8O2bmlnIHdyb3RlOgo+PiBBbSAyMC4wNC4yMSB1bSAw OTowNCBzY2hyaWViIE1pY2hhbCBIb2NrbzoKPj4+IE9uIE1vbiAxOS0wNC0yMSAxODozNzoxMywg Q2hyaXN0aWFuIEvDtm5pZyB3cm90ZToKPj4+PiBBbSAxOS4wNC4yMSB1bSAxODoxMSBzY2hyaWVi IE1pY2hhbCBIb2NrbzoKPiBbLi4uXQo+Pj4gV2hhdCBJIGFtIHRyeWluZyB0byBicmluZyB1cCB3 aXRoIE5VTUEgc2lkZSBpcyB0aGF0IHRoZSBzYW1lIHByb2JsZW0gY2FuCj4+PiBoYXBwZW4gb24g cGVyLW5vZGUgYmFzaXMuIExldCdzIHNheSB0aGF0IHNvbWUgdXNlciBjb25zdW1lcyB1bmV4cGVj dGVkbHkKPj4+IGxhcmdlIGFtb3VudCBvZiBkbWEtYnVmIG9uIGEgY2VydGFpbiBub2RlLiBUaGlz IGNhbiBsZWFkIHRvIG9ic2VydmFibGUKPj4+IHBlcmZvcm1hbmNlIGltcGFjdCBvbiBhbnlib2R5 IG9uIGFsbG9jYXRpbmcgZnJvbSB0aGF0IG5vZGUgYW5kIGV2ZW4KPj4+IHdvcnNlIGNhdXNlIGFu IE9PTSBmb3Igbm9kZSBib3VuZCBjb25zdW1lcnMuIEhvdyBkbyBJIGZpbmQgb3V0IHRoYXQgaXQK Pj4+IHdhcyBkbWEtYnVmIHRoYXQgaGFzIGNhdXNlZCB0aGUgcHJvYmxlbT8KPj4gWWVzLCB0aGF0 IGlzIHRoZSBkaXJlY3Rpb24gbXkgdGhpbmtpbmcgZ29lcyBhcyB3ZWxsLCBidXQgYWxzbyBldmVu IGZ1cnRoZXIuCj4+Cj4+IFNlZSBETUEtYnVmIGlzIGFsc28gdXNlZCB0byBzaGFyZSBkZXZpY2Ug bG9jYWwgbWVtb3J5IGJldHdlZW4gcHJvY2Vzc2VzIGFzCj4+IHdlbGwuIEluIG90aGVyIHdvcmRz IFZSQU0gb24gZ3JhcGhpY3MgaGFyZHdhcmUuCj4+Cj4+IE9uIG15IHRlc3Qgc3lzdGVtIGhlcmUg SSBoYXZlIDMyR0Igb2Ygc3lzdGVtIG1lbW9yeSBhbmQgMTZHQiBvZiBWUkFNLiBJIGNhbgo+PiB1 c2UgRE1BLWJ1ZiB0byBhbGxvY2F0ZSB0aGF0IDE2R0Igb2YgVlJBTSBxdWl0ZSBlYXNpbHkgd2hp Y2ggdGhlbiBzaG93cyB1cAo+PiB1bmRlciAvcHJvYy9tZW1pbmZvIGFzIHVzZWQgbWVtb3J5Lgo+ IFRoaXMgaXMgc29tZXRoaW5nIHRoYXQgd291bGQgYmUgcmVhbGx5IGludGVyZXN0aW5nIGluIHRo ZSBjaGFuZ2Vsb2cuIEkKPiBtZWFuIHRoZSBleHBlY3RlZCBhbmQgZXh0cmVtZSBtZW1vcnkgY29u c3VtcHRpb24gb2YgdGhpcyBtZW1vcnkuIElkZWFsbHkKPiB3aXRoIHNvbWUgaGludHMgb24gd2hh dCB0byBkbyB3aGVuIHRoZSBudW1iZXIgaXMgcmVhbGx5IGhpZ2ggKGUuZy4gbW91bnQKPiBkZWJ1 Z2ZzIGFuZCBoYXZlIGEgbG9vayBoZXJlIGFuZCB0aGVyZSB0byBjaGVjayB3aGV0aGVyIHRoaXMg aXMganVzdCB0b28KPiBtYW55IHVzZXJzIG9yIGFuIHVuZXhwZWN0ZWQgcGF0dGVybiB0byBiZSBy ZXBvcnRlZCkuCj4KPj4gQnV0IHRoYXQgaXNuJ3QgcmVhbGx5IHN5c3RlbSBtZW1vcnkgYXQgYWxs LCBpdCdzIGp1c3QgYWxsb2NhdGVkIGRldmljZQo+PiBtZW1vcnkuCj4gT0ssIHRoYXQgd2FzIG5v dCByZWFsbHkgY2xlYXIgdG8gbWUuIFNvIHRoaXMgaXMgbm90IHJlYWxseSBhY2NvdW50ZWQgdG8K PiBNZW1Ub3RhbD8KCkl0IGRlcGVuZHMuIEluIGEgbG90IG9mIGVtYmVkZGVkIHN5c3RlbXMgeW91 IG9ubHkgaGF2ZSBzeXN0ZW0gbWVtb3J5IGFuZCAKaW4gdGhpcyBjYXNlIHRoYXQgdmFsdWUgaGVy ZSBpcyBpbmRlZWQgcmVhbGx5IHVzZWZ1bC4KCj4gSWYgdGhhdCBpcyByZWFsbHkgdGhlIGNhc2Ug dGhlbiByZXBvcnRpbmcgaXQgaW50byB0aGUgb29tCj4gcmVwb3J0IGlzIGNvbXBsZXRlbHkgcG9p bnRsZXNzIGFuZCBJIGFtIG5vdCBldmVuIHN1cmUgL3Byb2MvbWVtaW5mbyBpcwo+IHRoZSByaWdo dCBpbnRlcmZhY2UgZWl0aGVyLiBJdCB3b3VsZCBqdXN0IGFkZCBtb3JlIGNvbmZ1c2lvbiBJIGFt Cj4gYWZyYWlkLgoKSSBraW5kIG9mIGFncmVlLiBBcyBJIHNhaWQgYSBETUEtYnVmIGNvdWxkIGJl IGJhY2tlZCBieSBzeXN0ZW0gbWVtb3J5IG9yIApkZXZpY2UgbWVtb3J5LgoKSW4gdGhlIGNhc2Ug d2hlbiBpdCBpcyBiYWNrZWQgYnkgc3lzdGVtIG1lbW9yeSBpdCBkb2VzIG1ha2Ugc2Vuc2UgdG8g CnJlcG9ydCB0aGlzIGluIGFuIE9PTSBkdW1wLgoKQnV0IG9ubHkgdGhlIGV4cG9ydGluZyBkcml2 ZXIga25vd3Mgd2hhdCB0aGUgRE1BLWJ1ZiBoYW5kbGUgcmVwcmVzZW50cywgCnRoZSBmcmFtZXdv cmsganVzdCBwcm92aWRlcyB0aGUgY29tbW9uIGdyb3VuZCBmb3IgaW50ZXIgZHJpdmVyIApjb21t dW5pY2F0aW9uLgoKPj4+IFNlZSB3aGVyZSBJIGFtIGhlYWRpbmc/Cj4+IFllYWgsIHRvdGFsbHku IFRoYW5rcyBmb3IgcG9pbnRpbmcgdGhpcyBvdXQuCj4+Cj4+IFN1Z2dlc3Rpb25zIGhvdyB0byBo YW5kbGUgdGhhdD8KPiBBcyBJJ3ZlIHBvaW50ZWQgb3V0IGluIHByZXZpb3VzIHJlcGx5IHdlIGRv IGhhdmUgYW4gQVBJIHRvIGFjY291bnQgcGVyCj4gbm9kZSBtZW1vcnkgYnV0IG5vdyB0aGF0IHlv dSBoYXZlIGJyb3VnaHQgdXAgdGhhdCB0aGlzIGlzIG5vdCBzb21ldGhpbmcKPiB3ZSBhY2NvdW50 IGFzIGEgcmVndWxhciBtZW1vcnkgdGhlbiB0aGlzIGRvZXNuJ3QgcmVhbGx5IGZpdCBpbnRvIHRo YXQKPiBtb2RlbC4gQnV0IG1heWJlIEkgYW0ganVzdCBjb25mdXNlZC4KCldlbGwgZG9lcyB0aGF0 IEFQSSBhbHNvIGhhcyBhIGNvdW50ZXIgZm9yIG1lbW9yeSB1c2VkIGJ5IGRldmljZSBkcml2ZXJz PwoKSWYgeWVzIHRoZW4gdGhlIGRldmljZSBkcml2ZXIgd2hvIGV4cG9ydGVkIHRoZSBETUEtYnVm IHNob3VsZCBwcm9iYWJseSAKdXNlIHRoYXQgQVBJLiBJZiBubyB3ZSBtaWdodCB3YW50IHRvIGNy ZWF0ZSBvbmUuCgpJIG1lYW4gdGhlIGF1dGhvciBvZiB0aGlzIHBhdGNoIHNlZW1zIHRvIGhhdmUg YW4gdXNlIGNhc2Ugd2hlcmUgdGhpcyBpcyAKbmVlZGVkIGFuZCBJIGFsc28gc2VlIHRoYXQgd2Ug aGF2ZSBzb21lIGhvbGUgaW4gaG93IHdlIGFjY291bnQgbWVtb3J5LgoKQ2hyaXN0aWFuLgpfX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2ZWwgbWFp bGluZyBsaXN0CmRyaS1kZXZlbEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5m cmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWwK