Received: by 2002:a05:6358:53a8:b0:117:f937:c515 with SMTP id z40csp252694rwe; Fri, 14 Apr 2023 02:08:28 -0700 (PDT) X-Google-Smtp-Source: AKy350bcMYdLbHDzgeeswGAP6V9Zd9+rwM1qNpYsNLZuLL98c1bkuzTRM9n9hVF6LsUdqfZCYFdU X-Received: by 2002:a05:6a21:338d:b0:ec:983b:d9a1 with SMTP id yy13-20020a056a21338d00b000ec983bd9a1mr4423339pzb.15.1681463308291; Fri, 14 Apr 2023 02:08:28 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1681463308; cv=none; d=google.com; s=arc-20160816; b=jt2FkspxWRSLy1j8dFPyzkAuER7YcV3DRMWmSeQWz9ZVEI8VKrotgvg/UkcIndpIwn OVmhwrEM00XTyr4aGY5C/g6hoJ7IaEefDP378WbqnLh7/N0xXmbcMShHttBNwDC++dzZ TXKgWO6h6XBz/71ZcZPNmTSruL7FiiAj6v8ast4MKo6w786UQBkMYSCMGsi+1tPTOMrB 47IUIWunyRc3d6kNYOGnQaZNkbPR/OwHMjm0OsmXMoyEjIdWBEx5LrBNKL/PeNRm632R 8fJxv/vOPPWZyZri4sSOhnYwsg1qSql2GniLiWX7lBcPhnLfJeo9L6Uq2GPnS5aU3yay nMAw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:in-reply-to :organization:from:references:to:content-language:subject:user-agent :mime-version:date:message-id:dkim-signature; bh=pvZq4J2QTeEJVF8gm4OtDF/aQuuSp8MvxJj30BGONJ4=; b=bLTdPnaQ2+4QzCBsXQ5iCzUHR7DET2rk1IG1430ej3i1i5vS+6NtpDMQ3cMRzbYq6K h8+gr1+tMGD3GPwVE7KmmARF8y4eIUF1MZqfpd6zz8l9jFMxDEgsqcabsVz7HJGiDOJU sNkGzuIFyxArTqt3Pboh7vIrJy5tqB47yYMeKv5mAuQD4Ocq+lKLIupJQggnmWQpVyaf n+nYCFCI0MHl0VyemIw5IoW7s0EygKkqK7Niz0GnHM0EHOgELf9jNvpfCvHD1VUgSz1A aLF6UQzLsXf7x0JpVYvR8Fo/QZ6H3F6L4lEPs/gW+GKlALROIL8azovxeVhg5F2JEPx0 hlsA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=TWtzYr15; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id g15-20020a63110f000000b004fba312c234si4120616pgl.401.2023.04.14.02.08.15; Fri, 14 Apr 2023 02:08:28 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=TWtzYr15; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230288AbjDNI5q (ORCPT + 99 others); Fri, 14 Apr 2023 04:57:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35412 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230270AbjDNI5o (ORCPT ); Fri, 14 Apr 2023 04:57:44 -0400 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B44266E9D; Fri, 14 Apr 2023 01:57:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1681462659; x=1712998659; h=message-id:date:mime-version:subject:to:references:from: in-reply-to:content-transfer-encoding; bh=hcwYZyfgZwtaQbHH0lohhvn9zFf1dcVeacht+B2r16Q=; b=TWtzYr15EEz+zIZUPDh60o6Gwd9RIjVg9NO9DbBCnLxhxbb2+SJp5O4x Bh3GgSVPRXUKogwJLxroaheNqFi87yBrp2a7Q1+FqaYLdW/WVBINe4mUD 8A9GvVIkszVWPMu2/OKyHEu9gviGRCvcgvQOR6Jff/+K0bWM50YZvyU8M XkK9tk2aE4LLt5aul9n++7Db1YqrFpec65DcCvhElI6bgh3g9LIOCsNj1 gUYC2PBUEIINoTDVgVVn4r+ogO8Gle5uX+yvwznf5i9hrtSzpdwnrDSTo bZ4nUOZmG6PDRhlvr53Ihp5FcyWstLoz4m3WE1TPWTum6ZInukwWGr6S/ g==; X-IronPort-AV: E=McAfee;i="6600,9927,10679"; a="409617362" X-IronPort-AV: E=Sophos;i="5.99,195,1677571200"; d="scan'208";a="409617362" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Apr 2023 01:57:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10679"; a="640044450" X-IronPort-AV: E=Sophos;i="5.99,195,1677571200"; d="scan'208";a="640044450" Received: from sokeeffe-mobl.ger.corp.intel.com (HELO [10.213.222.60]) ([10.213.222.60]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Apr 2023 01:57:35 -0700 Message-ID: <8893ad56-8807-eb69-2185-b338725f0b18@linux.intel.com> Date: Fri, 14 Apr 2023 09:57:32 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.0 Subject: Re: [PATCH v3 6/7] drm: Add fdinfo memory stats Content-Language: en-US To: Rob Clark , dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Boris Brezillon , Christopher Healy , Emil Velikov , Rob Clark , David Airlie , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Jonathan Corbet , "open list:DOCUMENTATION" , open list References: <20230411225725.2032862-1-robdclark@gmail.com> <20230411225725.2032862-7-robdclark@gmail.com> <29a8d9aa-c6ea-873f-ce0b-fb8199b13068@linux.intel.com> From: Tvrtko Ursulin Organization: Intel Corporation UK Plc In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-6.5 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,HK_RANDOM_ENVFROM,HK_RANDOM_FROM, NICE_REPLY_A,RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE, SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 13/04/2023 21:05, Daniel Vetter wrote: > On Thu, Apr 13, 2023 at 05:40:21PM +0100, Tvrtko Ursulin wrote: >> >> On 13/04/2023 14:27, Daniel Vetter wrote: >>> On Thu, Apr 13, 2023 at 01:58:34PM +0100, Tvrtko Ursulin wrote: >>>> >>>> On 12/04/2023 20:18, Daniel Vetter wrote: >>>>> On Wed, Apr 12, 2023 at 11:42:07AM -0700, Rob Clark wrote: >>>>>> On Wed, Apr 12, 2023 at 11:17 AM Daniel Vetter wrote: >>>>>>> >>>>>>> On Wed, Apr 12, 2023 at 10:59:54AM -0700, Rob Clark wrote: >>>>>>>> On Wed, Apr 12, 2023 at 7:42 AM Tvrtko Ursulin >>>>>>>> wrote: >>>>>>>>> >>>>>>>>> >>>>>>>>> On 11/04/2023 23:56, Rob Clark wrote: >>>>>>>>>> From: Rob Clark >>>>>>>>>> >>>>>>>>>> Add support to dump GEM stats to fdinfo. >>>>>>>>>> >>>>>>>>>> v2: Fix typos, change size units to match docs, use div_u64 >>>>>>>>>> v3: Do it in core >>>>>>>>>> >>>>>>>>>> Signed-off-by: Rob Clark >>>>>>>>>> Reviewed-by: Emil Velikov >>>>>>>>>> --- >>>>>>>>>> Documentation/gpu/drm-usage-stats.rst | 21 ++++++++ >>>>>>>>>> drivers/gpu/drm/drm_file.c | 76 +++++++++++++++++++++++++++ >>>>>>>>>> include/drm/drm_file.h | 1 + >>>>>>>>>> include/drm/drm_gem.h | 19 +++++++ >>>>>>>>>> 4 files changed, 117 insertions(+) >>>>>>>>>> >>>>>>>>>> diff --git a/Documentation/gpu/drm-usage-stats.rst b/Documentation/gpu/drm-usage-stats.rst >>>>>>>>>> index b46327356e80..b5e7802532ed 100644 >>>>>>>>>> --- a/Documentation/gpu/drm-usage-stats.rst >>>>>>>>>> +++ b/Documentation/gpu/drm-usage-stats.rst >>>>>>>>>> @@ -105,6 +105,27 @@ object belong to this client, in the respective memory region. >>>>>>>>>> Default unit shall be bytes with optional unit specifiers of 'KiB' or 'MiB' >>>>>>>>>> indicating kibi- or mebi-bytes. >>>>>>>>>> >>>>>>>>>> +- drm-shared-memory: [KiB|MiB] >>>>>>>>>> + >>>>>>>>>> +The total size of buffers that are shared with another file (ie. have more >>>>>>>>>> +than a single handle). >>>>>>>>>> + >>>>>>>>>> +- drm-private-memory: [KiB|MiB] >>>>>>>>>> + >>>>>>>>>> +The total size of buffers that are not shared with another file. >>>>>>>>>> + >>>>>>>>>> +- drm-resident-memory: [KiB|MiB] >>>>>>>>>> + >>>>>>>>>> +The total size of buffers that are resident in system memory. >>>>>>>>> >>>>>>>>> I think this naming maybe does not work best with the existing >>>>>>>>> drm-memory- keys. >>>>>>>> >>>>>>>> Actually, it was very deliberate not to conflict with the existing >>>>>>>> drm-memory- keys ;-) >>>>>>>> >>>>>>>> I wouldn't have preferred drm-memory-{active,resident,...} but it >>>>>>>> could be mis-parsed by existing userspace so my hands were a bit tied. >>>>>>>> >>>>>>>>> How about introduce the concept of a memory region from the start and >>>>>>>>> use naming similar like we do for engines? >>>>>>>>> >>>>>>>>> drm-memory-$CATEGORY-$REGION: ... >>>>>>>>> >>>>>>>>> Then we document a bunch of categories and their semantics, for instance: >>>>>>>>> >>>>>>>>> 'size' - All reachable objects >>>>>>>>> 'shared' - Subset of 'size' with handle_count > 1 >>>>>>>>> 'resident' - Objects with backing store >>>>>>>>> 'active' - Objects in use, subset of resident >>>>>>>>> 'purgeable' - Or inactive? Subset of resident. >>>>>>>>> >>>>>>>>> We keep the same semantics as with process memory accounting (if I got >>>>>>>>> it right) which could be desirable for a simplified mental model. >>>>>>>>> >>>>>>>>> (AMD needs to remind me of their 'drm-memory-...' keys semantics. If we >>>>>>>>> correctly captured this in the first round it should be equivalent to >>>>>>>>> 'resident' above. In any case we can document no category is equal to >>>>>>>>> which category, and at most one of the two must be output.) >>>>>>>>> >>>>>>>>> Region names we at most partially standardize. Like we could say >>>>>>>>> 'system' is to be used where backing store is system RAM and others are >>>>>>>>> driver defined. >>>>>>>>> >>>>>>>>> Then discrete GPUs could emit N sets of key-values, one for each memory >>>>>>>>> region they support. >>>>>>>>> >>>>>>>>> I think this all also works for objects which can be migrated between >>>>>>>>> memory regions. 'Size' accounts them against all regions while for >>>>>>>>> 'resident' they only appear in the region of their current placement, etc. >>>>>>>> >>>>>>>> I'm not too sure how to rectify different memory regions with this, >>>>>>>> since drm core doesn't really know about the driver's memory regions. >>>>>>>> Perhaps we can go back to this being a helper and drivers with vram >>>>>>>> just don't use the helper? Or?? >>>>>>> >>>>>>> I think if you flip it around to drm-$CATEGORY-memory{-$REGION}: then it >>>>>>> all works out reasonably consistently? >>>>>> >>>>>> That is basically what we have now. I could append -system to each to >>>>>> make things easier to add vram/etc (from a uabi standpoint).. >>>>> >>>>> What you have isn't really -system, but everything. So doesn't really make >>>>> sense to me to mark this -system, it's only really true for integrated (if >>>>> they don't have stolen or something like that). >>>>> >>>>> Also my comment was more in reply to Tvrtko's suggestion. >>>> >>>> Right so my proposal was drm-memory-$CATEGORY-$REGION which I think aligns >>>> with the current drm-memory-$REGION by extending, rather than creating >>>> confusion with different order of key name components. >>> >>> Oh my comment was pretty much just bikeshed, in case someone creates a >>> $REGION that other drivers use for $CATEGORY. Kinda Rob's parsing point. >>> So $CATEGORY before the -memory. >>> >>> Otoh I don't think that'll happen, so I guess we can go with whatever more >>> folks like :-) I don't really care much personally. >> >> Okay I missed the parsing problem. >> >>>> AMD currently has (among others) drm-memory-vram, which we could define in >>>> the spec maps to category X, if category component is not present. >>>> >>>> Some examples: >>>> >>>> drm-memory-resident-system: >>>> drm-memory-size-lmem0: >>>> drm-memory-active-vram: >>>> >>>> Etc.. I think it creates a consistent story. >>>> >>>> Other than this, my two I think significant opens which haven't been >>>> addressed yet are: >>>> >>>> 1) >>>> >>>> Why do we want totals (not per region) when userspace can trivially >>>> aggregate if they want. What is the use case? >>>> >>>> 2) >>>> >>>> Current proposal limits the value to whole objects and fixates that by >>>> having it in the common code. If/when some driver is able to support sub-BO >>>> granularity they will need to opt out of the common printer at which point >>>> it may be less churn to start with a helper rather than mid-layer. Or maybe >>>> some drivers already support this, I don't know. Given how important VM BIND >>>> is I wouldn't be surprised. >>> >>> I feel like for drivers using ttm we want a ttm helper which takes care of >>> the region printing in hopefully a standard way. And that could then also >>> take care of all kinds of of partial binding and funny rules (like maybe >>> we want a standard vram region that addds up all the lmem regions on >>> intel, so that all dgpu have a common vram bucket that generic tools >>> understand?). >> >> First part yes, but for the second I would think we want to avoid any >> aggregation in the kernel which can be done in userspace just as well. Such >> total vram bucket would be pretty useless on Intel even since userspace >> needs to be region aware to make use of all resources. It could even be >> counter productive I think - "why am I getting out of memory when half of my >> vram is unused!?". > > This is not for intel-aware userspace. This is for fairly generic "gputop" > style userspace, which might simply have no clue or interest in what lmemX > means, but would understand vram. > > Aggregating makes sense. Lmem vs vram is now an argument not about aggregation but about standardizing regions names. One detail also is a change in philosophy compared to engine stats where engine names are not centrally prescribed and it was expected userspace will have to handle things generically and with some vendor specific knowledge. Like in my gputop patches. It doesn't need to understand what is what, it just finds what's there and presents it to the user. Come some accel driver with local memory it wouldn't be vram any more. Or even a headless data center GPU. So I really don't think it is good to hardcode 'vram' in the spec, or midlayer, or helpers. And for aggregation.. again, userspace can do it just as well. If we do it in kernel then immediately we have multiple sets of keys to output for any driver which wants to show the region view. IMO it is just pointless work in the kernel and more code in the kernel, when userspace can do it. Proposal A (one a discrete gpu, one category only): drm-resident-memory: x KiB drm-resident-memory-system: x KiB drm-resident-memory-vram: x KiB Two loops in the kernel, more parsing in userspace. Proposal B: drm-resident-memory-system: x KiB drm-resident-memory-vram: x KiB Can be one loop, one helper, less text for userspace to parse and it can still trivially show the total if so desired. For instance a helper (or two) with a common struct containing region names and totals, where a callback into the driver tallies under each region, as the drm helper is walking objects. >>> It does mean we walk the bo list twice, but *shrug*. People have been >>> complaining about procutils for decades, they're still horrible, I think >>> walking bo lists twice internally in the ttm case is going to be ok. If >>> not, it's internals, we can change them again. >>> >>> Also I'd lean a lot more towards making ttm a helper and not putting that >>> into core, exactly because it's pretty clear we'll need more flexibility >>> when it comes to accurate stats for multi-region drivers. >> >> Exactly. >> >>> But for a first "how much gpu space does this app use" across everything I >>> think this is a good enough starting point. >> >> Okay so we agree this would be better as a helper and not in the core. > > Nope, if you mean with this = Rob's patch. I was talking about a > hypothetical region-aware extension for ttm-using drivers. > >> On the point are keys/semantics good enough as a starting point I am still >> not convinced kernel should aggregate and that instead we should start from >> day one by appending -system (or something) to Rob's proposed keys. > > It should imo. Inflicting driver knowledge on generic userspace makes not > much sense, we should start with the more generally useful stuff imo. > That's why there's the drm fdinfo spec and all that so it's not a > free-for-all. > > Also Rob's stuff is _not_ system. Check on a i915 dgpu if you want :-) I am well aware it adds up everything, that is beside the point. Drm-usage-stats.rst text needs to be more precise across all keys at least: +- drm-resident-memory: [KiB|MiB] + +The total size of buffers that are resident in system memory. But as said, I don't see the point in providing aggregated values. Regards, Tvrtko