70714 2011-10-24 02:00:05 -0700 [chromium] Encapsulate state machine parts of scheduling in CCSchedulerStateMachine 2011-10-27 12:33:54 -0700 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 nduca nduca enne fishd jamesr jbates oldest_to_newest 489232 0 nduca 2011-10-24 02:00:05 -0700 [chromium] Encapsulate state machine parts of scheduling in CCSchedulerStateMachine 489233 1 112163 nduca 2011-10-24 02:00:30 -0700 Created attachment 112163 Patch 489248 2 nduca 2011-10-24 02:39:48 -0700 This patch introduces the CCSchedulerStateMachine as a place to store the state machine that we typically keep inside render_widget. Goal #1 here was getting our scheduling algorithms in one place and well-covered by tests. Its integration with the rest of code will be a followup patch. The first thing to notice in this code is how "actions" are taken by the scheduler. The obvious way to do this would be to have CCSchedulerClient { void draw(); } And in the code that calls draw, we'd write: if ( ... conditions leading to draw ...) m_client->draw(); ... clear conditions that indicate drawing needed The thing that has always caused me pain with such code is that it commingles "deciding what to do" with "advancing state." So, I switched to an "ACTION" model: Action getNextState() { if (... need to draw...) return draw; } void updateState(Action) { if (draw) clear conditions that lead to draw; } This may have been a mistake. I'm open to feedback. One key challenge was whether "we are on a vsync line" was state or not. Since the scheduler cannot directly affect vsync, I opted for it being ephemeral state: when one asks for a next state, you pass in whether you're on the vsync. The idea is that b70713's FrameRateController will be the source of that information. Putting this all together, the rough way one uses the CCSchedulerStateMachine is: m_ssm.updateState(... something that we did outside the scheduler ...) reschedule(); I.e. anytime you tweak the scheduler state, reschedule. Where: void reschedule() { while(true) { Action action = m_ssm->getNextAction(); if (action == ACTION_NONE) break; handleAction(action); } } void handleAction(Action action) { if(action == DRAW) { drawLayersAndSwap(); } if(action == BEGIN_FRAME) { beginFrame(); } ... m_ssm->updateState(action); } The last few tests in CCSchedulerStateMachineTest.cpp show how a frame runs through the machine. As a result, they might be a good place to start when looking through the code. Have at it! :) 489564 3 112163 jamesr 2011-10-24 13:27:10 -0700 Comment on attachment 112163 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=112163&action=review > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.cpp:33 > + if (m_commitState == COMMIT_STATE_IDLE) { would this be clearer as a switch statement? one advantage of switching on an enum value is that the compiler will yell if we're missing a case: instead of relying on a runtime ASSERT_NOT_REACHED() > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.cpp:46 > + if (insideVSyncTick && m_needsRedraw) nit: the other conditionals are (m_dlkfj && insideVSyncTick), why's this one the other way around? > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.cpp:61 > + if (action == ACTION_NONE) switch maybe? > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.cpp:71 > + // Prevent another UPDATE_MORE_RESOURCES call until we draw again. I can't really tell what an "UPDATE_MORE_RESOURCES call" is in this context > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.cpp:93 > + if (input == INPUT_SET_NEEDS_REDRAW) { switch? > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.h:31 > +/** > + * The CCSchedulerStateMachine decides how to coordinates main thread activites why is this a c-style comment? we normally only use that for license header blocks > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.h:39 > + * The scheduler seprates "what to do next" from the updating of its internal state to seprates -> separates > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.h:78 > + Action getNextAction(bool insideVSyncTick) const; we would normally name this 'nextAction()' - or if you want to emphasize that this isn't just a simple getter maybe calculateNextAction()? > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.h:79 > + void updateState(Action); can you add some comments here (or possibly at the class-level comment) about how a caller is supposed to use these two functions? > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.h:82 > + INPUT_SET_NEEDS_REDRAW = 1, the other enums start at 0, why does this one start at 1? do you need to provide explicit numerical values for these or could you just let the compiler do that? > Source/WebKit/chromium/tests/CCSchedulerStateMachineTest.cpp:45 > +/* Exposes the protected state fields of the CCSchedulerStateMachine for testing */ use a // style comment for 1-liners 490499 4 112163 jamesr 2011-10-25 17:46:49 -0700 Comment on attachment 112163 Patch R- for pile of nits to remove this from pending-review queue, although this seems great overall. 490548 5 nduca 2011-10-25 21:38:29 -0700 (In reply to comment #4) > do you need to provide explicit numerical values for these or could you just let the compiler do that? When gtests fail, they give a number. It helped my head debug those failures rather than having to count enums to recreate what the compiler did in my head. Its style I guess, I can yank it? 490552 6 112448 nduca 2011-10-25 21:54:09 -0700 Created attachment 112448 input enum -> real functions 490570 7 jamesr 2011-10-25 22:54:28 -0700 I don't think there's anything horribly wrong with giving enums explicit values, but it isn't what we normally do unless the values are going to be used in a bitfield or the numeric values are part of the public API. Seeing numeric values in the header makes me think that one of those two things is going to happen. When debugging I can't remember finding explicit numeric values in the source very useful, since GDB can print out the numeric values and it's not too hard to count when looking at logs or other non-interactive debugging modes. 490577 8 112448 jamesr 2011-10-25 23:01:51 -0700 Comment on attachment 112448 input enum -> real functions View in context: https://bugs.webkit.org/attachment.cgi?id=112448&action=review R=me, remaining nits are up to you > Source/WebCore/platform/graphics/chromium/cc/CCSchedulerStateMachine.h:43 > + : m_commitState(COMMIT_STATE_IDLE) odd indentation - the : should be 4 spaces in from the previous line. Could you move the c'tor to the .cpp? there's a whole lotta lines to read here before we get to the API bits that a user of this class would be interested in > Source/WebKit/chromium/tests/CCSchedulerStateMachineTest.cpp:180 > +TEST(CCSchedulerStateMachineTest, TestSetNeedsCommitIsntLost) IsntLost->IsNotLost ? looks like a typo without the apostrophe (although you obviously can't put that in the function name) 490705 9 nduca 2011-10-26 02:47:23 -0700 Agreed with all remaining nits. Will land tomorrow morning. 491763 10 nduca 2011-10-27 11:29:53 -0700 Committed r98612: <http://trac.webkit.org/changeset/98612> 491779 11 nduca 2011-10-27 11:45:41 -0700 Reverted r98612 for reason: Broke build Committed r98613: <http://trac.webkit.org/changeset/98613> 491828 12 nduca 2011-10-27 12:33:54 -0700 Committed r98618: <http://trac.webkit.org/changeset/98618> 112163 2011-10-24 02:00:30 -0700 2011-10-25 21:54:05 -0700 Patch bug-70714-20111024020028.patch text/plain 23301 nduca U3VidmVyc2lvbiBSZXZpc2lvbjogOTgxMzcKZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJDb3JlL0No YW5nZUxvZyBiL1NvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwppbmRleCAwOGZmNjFjZDljNjY0MWM4 MGQzMjVlMjA1NmM3ZjA4YTEyMDYxNjQ3Li42YTQxMjBiNGVlMWJiM2YyYzg0ZTk2NWRmYmQxZGI3 MjE2YmNjZWJiIDEwMDc1NQotLS0gYS9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKKysrIGIvU291 cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTkgQEAKKzIwMTEtMTAtMjQgIE5hdCBE dWNhICA8bmR1Y2FAY2hyb21pdW0ub3JnPgorCisgICAgICAgIFtjaHJvbWl1bV0gRW5jYXBzdWxh 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