93606 2012-08-09 05:20:26 -0700 [Qt] UpdateAtlas is wasting memory 2012-08-22 15:21:05 -0700 1 1 1 Unclassified WebKit WebKit2 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED Qt, QtTriaged P2 Normal --- 1 kbalazs allan.jensen allan.jensen cmarcelo jturcotte kenneth menard noam webkit.review.bot zoltan oldest_to_newest 691405 0 kbalazs 2012-08-09 05:20:26 -0700 After spending some time reading the code of UpdateAtlas and trying to understand it I have added some printf's because my suspicion was that it don't use the whole surface it allocates. The suspicion has been trusted. I am going to upload the debug code and the results and the patches I made and the results with them. Actually I made two and I'm not sure which is the better :) 691418 1 157444 kbalazs 2012-08-09 05:25:36 -0700 Created attachment 157444 debug code With this patch I see that: Atlas cache fail; requiredDim=512, bufsize=4000000, usedBytes=1572864 a lot of times. So if I'm not wrong we use only ~1.5 MB from the ~4 MB surface we allocate (maybe a bit more for smaller tiles but those are rare so it does not make it much better). 691431 2 157449 kbalazs 2012-08-09 05:33:36 -0700 Created attachment 157449 fix candidate 1 This is a fix for the original logic (at least what I get from it). I believe we can possibly use the whole surface area with this. This is the output with the patch: "Atlas cache fail; Atlas cache fail; requiredDim=512, bufsize=4000000, usedBytes=2359296" a lot of times, but less than before. What makes me worry is that we still use only about the half of the surface. The use case I do is simple: just loading google.com, zooming as possible and scrolling. 691442 3 jturcotte 2012-08-09 05:42:38 -0700 Allan did some work and had a pretty efficiently working patch using existing Qt code. I looked at it briefly before, and the problem as it seemed to me is that we ONLY use a layouted sub-area of the atlas for an update size that fits in the chunk. So while doing full page renderings (e.g. when loading), if my atlas is 2048x2048 and I need to send over 4 tiles of 512x512, then only 2 of them will be successfully allocated. The other half of the buffer is reserved for smaller updates, which won't happen for this frame and the space is wasted. I didn't look at it very deeply so I might be wrong about this, but I at least did observe wasted space too. 691455 4 157457 kbalazs 2012-08-09 05:51:03 -0700 Created attachment 157457 fix candidate 2 This one divides the surface to equal size sub-buffers, so we can effectively use the whole surface. Atlases are created with a size class, so there can be an atlas for 512x512 requests, one for 256x256, and so on. I did not add the debug code here because it is evident that if there is a cache fail than the whole atlas is used. 691457 5 kbalazs 2012-08-09 05:53:42 -0700 (In reply to comment #3) > Allan did some work and had a pretty efficiently working patch using existing Qt code. > I looked at it briefly before, and the problem as it seemed to me is that we ONLY use a layouted sub-area of the atlas for an update size that fits in the chunk. > > So while doing full page renderings (e.g. when loading), if my atlas is 2048x2048 and I need to send over 4 tiles of 512x512, then only 2 of them will be successfully allocated. The other half of the buffer is reserved for smaller updates, which won't happen for this frame and the space is wasted. > > I didn't look at it very deeply so I might be wrong about this, but I at least did observe wasted space too. Yes. This is the problem I am trying to solve in candidate 2. (The other problem is that the current code is just buggy, candidate 1 if fixing it.) 691478 6 kbalazs 2012-08-09 09:07:00 -0700 story continues as bugzilla resurrected... Let's see how many atlases are allocated. For this reason I printed in the update atlas ctor with the dimension (which is contant in trunk and candidate 1). Results (all of them with simply zooming in google.com and scrolling): ref UpdateAtlas: 2000 UpdateAtlas: 2000 UpdateAtlas: 2000 UpdateAtlas: 2000 UpdateAtlas: 2000 UpdateAtlas: 2000 UpdateAtlas: 2000 UpdateAtlas: 2000 UpdateAtlas: 2000 candidate 1 UpdateAtlas: 2000 UpdateAtlas: 2000 UpdateAtlas: 2000 UpdateAtlas: 2000 candidate 2 UpdateAtlas: 2048 UpdateAtlas: 1024 UpdateAtlas: 128 UpdateAtlas: 512 UpdateAtlas: 2048 UpdateAtlas: 2048 UpdateAtlas: 128 UpdateAtlas: 512 UpdateAtlas: 1024 So, candidate 1 needs less allocation, but according to my calculation it still use 2.5Mb more memory. Allan, could you upload your work, so we can compare with these? 691488 7 noam 2012-08-09 09:15:45 -0700 I'm good with either direction - the original UpdateAtlas was supposed to make memory allocations more predictable, but it can be fine tuned in many ways and we should pick one :) I think I like (2) better because the smaller atlases allow us to lock GraphicsSurfaces, e.g. on Mac, without locking everything. 691509 8 allan.jensen 2012-08-09 09:36:58 -0700 (In reply to comment #6) > > Allan, could you upload your work, so we can compare with these? I will try to find it, but essentially it was just an experiment, moving the textureatlas from qt3d and hooking it in as replacement for the existing atlas. It worked just fine, but I never got around to reformating the textureatlas to WebKit style, or make qt3d export it. 691597 9 kbalazs 2012-08-09 10:57:03 -0700 (In reply to comment #7) > I'm good with either direction - the original UpdateAtlas was supposed to make memory allocations more predictable, but it can be fine tuned in many ways and we should pick one :) > > I think I like (2) better because the smaller atlases allow us to lock GraphicsSurfaces, e.g. on Mac, without locking everything. Cool. However, Jocelyn mentioned that we could probably stay in one simple atlas with a dynamic layout, so now I'm investigating with this. 692453 10 157705 allan.jensen 2012-08-10 04:51:21 -0700 Created attachment 157705 QAreaAllocator-Experiment 692455 11 allan.jensen 2012-08-10 04:52:46 -0700 (In reply to comment #10) > Created an attachment (id=157705) [details] > QAreaAllocator-Experiment This replaces updateatlas with hooks to QAreaAllocator which has been imported from Qt3D. 692466 12 allan.jensen 2012-08-10 05:02:47 -0700 (In reply to comment #6) > story continues as bugzilla resurrected... > > Let's see how many atlases are allocated. For this reason I printed in the update atlas ctor with the dimension (which is contant in trunk and candidate 1). Results (all of them with simply zooming in google.com and scrolling): > > ref > UpdateAtlas: 2000 > UpdateAtlas: 2000 > UpdateAtlas: 2000 > UpdateAtlas: 2000 > UpdateAtlas: 2000 > UpdateAtlas: 2000 > UpdateAtlas: 2000 > UpdateAtlas: 2000 > UpdateAtlas: 2000 > > candidate 1 > UpdateAtlas: 2000 > UpdateAtlas: 2000 > UpdateAtlas: 2000 > UpdateAtlas: 2000 > > candidate 2 > UpdateAtlas: 2048 > UpdateAtlas: 1024 > UpdateAtlas: 128 > UpdateAtlas: 512 > UpdateAtlas: 2048 > UpdateAtlas: 2048 > UpdateAtlas: 128 > UpdateAtlas: 512 > UpdateAtlas: 1024 > > So, candidate 1 needs less allocation, but according to my calculation it still use 2.5Mb more memory. > > Allan, could you upload your work, so we can compare with these? Apparently only two allocations: WebKit::UpdateAtlas::UpdateAtlas(int, WebKit::ShareableBitmap::Flags) 2048 WebKit::UpdateAtlas::UpdateAtlas(int, WebKit::ShareableBitmap::Flags) 2048 692485 13 kbalazs 2012-08-10 05:28:47 -0700 I'm working on something like QGeneralAllocator, but maybe it will be never be as complete. In this case the best solution could be to convert this code to webkit style and using it. 692488 14 kenneth 2012-08-10 05:35:34 -0700 (In reply to comment #13) > I'm working on something like QGeneralAllocator, but maybe it will be never be as complete. In this case the best solution could be to convert this code to webkit style and using it. It might be better to commit it as it is and then do the clean ups in separate patches which are easier to review 692494 15 157705 kenneth 2012-08-10 05:43:15 -0700 Comment on attachment 157705 QAreaAllocator-Experiment View in context: https://bugs.webkit.org/attachment.cgi?id=157705&action=review > Source/WebKit2/WebProcess/WebPage/UpdateAtlas.cpp:53 > + delete m_areaAllocator; > + m_areaAllocator = 0; OwnPtr? it has a clear() ? no? > Source/WebKit2/WebProcess/WebPage/UpdateAtlas.cpp:76 > + IntRect intrect(IntPoint::zero(), size); > + if (flags() & ShareableBitmap::SupportsAlpha) { > graphicsContext->setCompositeOperation(CompositeCopy); > - graphicsContext->fillRect(rect, Color::transparent, ColorSpaceDeviceRGB); > + graphicsContext->fillRect(intrect, Color::transparent, ColorSpaceDeviceRGB); wrong indentation, Why not just fillRect(IntRect(IntPoint::zero(), size)), ... 692550 16 noam 2012-08-10 08:21:00 -0700 (In reply to comment #14) > (In reply to comment #13) > > I'm working on something like QGeneralAllocator, but maybe it will be never be as complete. In this case the best solution could be to convert this code to webkit style and using it. > > It might be better to commit it as it is and then do the clean ups in separate patches which are easier to review That would probably break EFL, if they already use COORDINATED_GRAPHICS. 692581 17 kenneth 2012-08-10 09:00:40 -0700 (In reply to comment #16) > (In reply to comment #14) > > (In reply to comment #13) > > > I'm working on something like QGeneralAllocator, but maybe it will be never be as complete. In this case the best solution could be to convert this code to webkit style and using it. > > > > It might be better to commit it as it is and then do the clean ups in separate patches which are easier to review > > That would probably break EFL, if they already use COORDINATED_GRAPHICS. The class can be added without being enabled for that reason 692596 18 noam 2012-08-10 09:19:10 -0700 (In reply to comment #17) > (In reply to comment #16) > > (In reply to comment #14) > > > (In reply to comment #13) > > > > I'm working on something like QGeneralAllocator, but maybe it will be never be as complete. In this case the best solution could be to convert this code to webkit style and using it. > > > > > > It might be better to commit it as it is and then do the clean ups in separate patches which are easier to review > > > > That would probably break EFL, if they already use COORDINATED_GRAPHICS. > > The class can be added without being enabled for that reason OK then :) 693506 19 157952 allan.jensen 2012-08-13 03:44:44 -0700 Created attachment 157952 Patch 693510 20 157953 allan.jensen 2012-08-13 03:55:13 -0700 Created attachment 157953 Patch Fix a couple of leftover Qtisms 693525 21 157953 jturcotte 2012-08-13 04:09:55 -0700 Comment on attachment 157953 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=157953&action=review I didn't look at the AreaAllocator code, but here are some comments for the rest. > Source/WebKit2/Target.pri:706 > + WebProcess/WebPage/AreaAllocator.cpp \ Are we still the only ones building LayerTreeCoordinator? It seems so in my tree but it's quite old. > Source/WebKit2/WebProcess/WebPage/AreaAllocator.cpp:97 > +void GeneralAreaAllocator::expand(const WebCore::IntSize& size) > +{ I'm wondering if it's better to keep the code as similar to the original as possible, or to remove code that we're not using? I'd be more in favor of the later personally. > Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/LayerTreeCoordinator.cpp:636 > - static const int ScratchBufferDimension = 2000; > - m_updateAtlases.append(UpdateAtlas(ScratchBufferDimension, flags)); > - return m_updateAtlases.last().beginPaintingOnAvailableBuffer(handle, size, offset); > + m_updateAtlases.append(adoptPtr(new UpdateAtlas(size, flags))); > + return m_updateAtlases.last()->beginPaintingOnAvailableBuffer(handle, size, offset); You're now using the size of the needed update to determine the size of the constructed atlas, is this intended? Maybe it would be nice not to change the behavior of the size used for the atlas in this patch to segment possible regressions. You could keep the hard-coded value to 2000 or 2048 for now. > Source/WebKit2/WebProcess/WebPage/UpdateAtlas.cpp:43 > +UpdateAtlas::~UpdateAtlas() > { It's empty, please check if it's necessary. If it's just so that the OwnPtr destructor knows its type, then you can remove the AreaAllocator.h include from UpdateAtlas.h. 693686 22 kenneth 2012-08-13 08:41:38 -0700 > I'm wondering if it's better to keep the code as similar to the original as possible, or to remove code that we're not using? > I'd be more in favor of the later personally. I would go with the latter. But I suggest doing these cleans up in future patches to avoid regressions. 693690 23 157953 kenneth 2012-08-13 08:45:23 -0700 Comment on attachment 157953 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=157953&action=review > Source/WebKit2/WebProcess/WebPage/AreaAllocator.cpp:102 > + if (m_root->rect.size() == m_size) > + return; // No change. > + if (!m_root->left && m_root->largestFree.width() > 0) { I would suggest a newline after the return > Source/WebKit2/WebProcess/WebPage/AreaAllocator.cpp:116 > + if (m_size.width() >= m_size.height()) > + split = SplitOnX; > + else > + split = SplitOnY; > + while (m_root->rect.size() != m_size) { also here a newline before while > Source/WebKit2/WebProcess/WebPage/AreaAllocator.cpp:150 > +static inline bool fitsWithin(const WebCore::IntSize &size1, const WebCore::IntSize &size2) source, target? > Source/WebKit2/WebProcess/WebPage/AreaAllocator.h:104 > + Node *splitNode(Node*, Split); style 694326 24 157953 noam 2012-08-13 18:05:24 -0700 Comment on attachment 157953 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=157953&action=review >> Source/WebKit2/Target.pri:706 >> + WebProcess/WebPage/AreaAllocator.cpp \ > > Are we still the only ones building LayerTreeCoordinator? It seems so in my tree but it's quite old. EFL are building LayerTreeCoordinator as well. > Source/WebKit2/WebProcess/WebPage/AreaAllocator.cpp:39 > + m_size.expandedTo(size); This statement would have no effect. 694690 25 allan.jensen 2012-08-14 02:02:06 -0700 (In reply to comment #24) > > Source/WebKit2/WebProcess/WebPage/AreaAllocator.cpp:39 > > + m_size.expandedTo(size); > > This statement would have no effect. Are you sure? I thought it would expand m_size to the minimum of m_size and size. 694713 26 158265 allan.jensen 2012-08-14 02:19:18 -0700 Created attachment 158265 Patch 694773 27 noam 2012-08-14 03:49:02 -0700 (In reply to comment #25) > (In reply to comment #24) > > > Source/WebKit2/WebProcess/WebPage/AreaAllocator.cpp:39 > > > + m_size.expandedTo(size); > > > > This statement would have no effect. > > Are you sure? I thought it would expand m_size to the minimum of m_size and size. Yes, if I read the code correctly you need to assign the result, e.g. m_size = m_size.expandedTo(size). IntSize::expandedTo is const. 694795 28 allan.jensen 2012-08-14 04:22:24 -0700 Committed r125540: <http://trac.webkit.org/changeset/125540> 702405 29 158265 eric 2012-08-22 15:21:05 -0700 Comment on attachment 158265 Patch Cleared review? from attachment 158265 so that this bug does not appear in http://webkit.org/pending-review. 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