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MobileGL/docs/Disaggregated/notes/p4a/ab-redmi/two-arm.md
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swung0x48 aba329cc53 [Docs] (Disaggregated): P6's plan and contract draft; the working notes move from a local directory into the repository 
Two things land together: the plan and contract draft P6 needs before it starts, and the
working notes that until now existed on exactly one machine.

1. P6's plan and contract draft (neither started; not one line of code)

     docs/Disaggregated/P6-SPAWN-PLAN.md      the package plan
     docs/Disaggregated/P6-CONTRACT-DRAFT.md  the contract draft (moves to
                                              MG_Remote/CONTRACT-P6.md when c6 lands)

   The three findings that mattered, all written into the documents:

   a. P6 is SMALLER than its roadmap cell suggests. The transport primitives are already in
      the tree and already tested: SocketDoorbell including hangup detection and the two
      lost-wakeup fences (Doorbell.cpp:211-360, four cases in FdPassingTest), SCM_RIGHTS fd
      passing, ShmSegment::Adopt, and the SurfaceOp / WindowKind schema already defined in
      protocol.fbs. inproc uses a real second shm mapping rather than an alias, and
      SessionRings.h:22-28 says that was done so today is not the first time it runs. P6 is
      assembly plus a control plane plus a process, not "write a socket transport".

   b. The evidence for "P6 is only a transport swap" has EXPIRED. It was bought by P5c, whose
      audit found 59 direct memory accesses in a tree that already looked clean. P5e changed
      the tree again. So the first package, a6, is a read-only audit that writes no code, and
      every contract row that depends on it is marked PENDING a6 rather than decided in
      advance.

   c. P6 does not get a game running on the phone. ANativeWindow* is meaningless in the child,
      and protocol.fbs:186-196's own comment says Android transfers the window out of band -
      that band is P12. P6 lands pbuffer / surfaceless / offscreen, which is what HeadlessGL,
      the split-equivalent lane and trace replay need, and which is exactly what P6's own exit
      gate measures. A real window reaching the server is a named refusal. This gets its own
      section because "P6 is done" would otherwise read as "the game runs now".

   The contract adds rule G: a role may not name a process-local handle. It extends P5c's
   rule E (a role may not name the other role's memory) from memory to identity - EGLDisplay /
   EGLSurface / EGLContext / ANativeWindow* / fd number / pid / mapped address either cross as
   a token this contract defines or they do not cross, and a descriptor crosses only through
   SCM_RIGHTS, where the kernel renumbers it.

   What P5e left for P6 gets its own section. The latch semantics are already designed
   (ARCHITECTURE.md:504) and are copied unchanged. What is new is that after run-ahead the
   client no longer waits while the peer process can DIE: the client holds records that were
   published and will never be applied, and Android's freezer suspends the child without
   closing anything. So slow and dead must be distinguishable WITHOUT a timeout threshold.
   That is P6's only new design; everything else is carriage. It shares a predicate with E1's
   outstanding re-specification (ID-122), and the two should be designed together.

   Two gates carried over from P5e's lessons: G2 requires integration-spawn's test-name set to
   match integration-split's name for name, because a differing set means the lane is quietly
   running less; and the arm-proof gate requires every entry to record the child pid and
   transport=spawn in its OWN private log - ID-124 established that this kind of false green
   really happens, and a spawn lane that actually ran monolith would pass every other gate.
   S2's shape must be settled before it is written, and the document says why: E1 is the
   cautionary case.

2. The working notes move into the repository (docs/Disaggregated/notes/, 415 .md files)

   ROADMAP / CURRENT_STAGE_PROGRESS / MEASUREMENTS cite ruling numbers, audit line numbers and
   the provenance of gate figures from ~/w7/notes/, a directory that exists on one machine and
   is under no version control. A record cited hundreds of times that lives only locally is not
   a record, so it moves in whole, with its directory structure intact.

   Only .md moves. Scripts, run logs, census and gate result JSON, patches, APKs and nm dumps
   stay where they are: they are evidence DATA rather than documents - large, regenerated per
   run, and mostly carrying absolute paths and device serials that mean something only on the
   machine that produced them. The mapping and this split are written in
   docs/Disaggregated/notes/README.md.

   Two exceptions are recorded there too: P6's BRIEF has been promoted to a first-class
   document and keeps no copy under notes/, so the two cannot drift apart; and recovered/ holds
   material salvaged from failed workflow runs, which may duplicate the like-named phase
   directories and is kept because a few of those were the only complete version at the time.

   CI's citation lint takes docs/Disaggregated/*.md only (non-recursive), and notes/ is
   deliberately outside it: those notes' file:line citations were written against their own
   code heads, and resolving them against today's HEAD would fail wholesale - which is not an
   error, it is their correct state as a historical record. To check one, use the revision it
   declares (--rev).

3. Inconsistencies fixed in passing

   - README.md's status line still said P5e was in progress while the stage table already said
     closed.
   - CURRENT_STAGE_PROGRESS's next-step item 1 still listed the exit gate as pending, though
     (a) and (b) were run in the previous commit; rewritten to closed plus the one item that
     actually remains (E1).
   - ROADMAP's P6 row still had the pre-phase plan in three of its cells; it now carries the
     package order, the scope boundary and the two new gates.

Checked with check_doc_citations.py: 125 citations across docs/Disaggregated/*.md, 0 problems.
2026-09-18 23:31:39 -04:00

10 KiB
Raw Blame History

P2 paired A/B - per-thread CPU per frame (ms), trailing window, push - pull

pin columns: before/after verdict per run (P=PINNED, D=DRIFT = a cluster clamped by thermal management, U=UNPINNED) @ cpuss temperature C p50/p99: the runner's best-of-N repeat (lowest mean wall frame time), trailing tailFrames window, device median rule / nearest-rank p99; 'best' says which repeat

device case backend mode pull p50 push p50 d p50 pull p99 push p99 d p99 frames best pull/push pull acc/draw push acc/draw pin pull pin push
2f7cbe2e improved-transparency-minecraft-26.3 DirectGLES finish 10.727 12.320 +1.593 26.805 26.972 +0.167 200/200 run 1/3 / run 2/3 8.39 6.39 P@40.3/P@40.3 P@41.1/P@40.7
2f7cbe2e improved-transparency-minecraft-26.3 DirectGLES nofinish 10.716 12.124 +1.408 25.297 26.841 +1.544 200/200 run 3/3 / run 1/3 8.39 6.39 P@39.1/P@41.5 P@39.9/P@41.5
2f7cbe2e improved-transparency-minecraft-26.3 DirectVulkan finish 10.634 11.570 +0.936 24.975 25.958 +0.983 200/200 run 2/3 / run 2/3 6.52 6.52 P@41.5/P@42.6 P@40.3/P@43.0
2f7cbe2e improved-transparency-minecraft-26.3 DirectVulkan nofinish 10.603 11.585 +0.982 24.979 26.021 +1.042 200/200 run 2/3 / run 1/3 6.52 6.52 P@41.5/P@41.8 P@40.3/P@42.2
2f7cbe2e minecraft-1.21.4-fabric-iris-bsl-in-world DirectGLES finish 1.759 1.839 +0.080 322.670 320.204 -2.466 123/123 run 1/3 / run 2/3 40.95 39.07 P@39.9/P@41.5 P@41.5/P@41.8
2f7cbe2e minecraft-1.21.4-fabric-iris-bsl-in-world DirectGLES nofinish 1.727 1.811 +0.084 319.025 319.226 +0.201 123/123 run 2/3 / run 3/3 40.95 39.07 P@41.1/P@42.2 P@41.5/P@41.8
2f7cbe2e minecraft-1.21.4-fabric-iris-bsl-in-world DirectVulkan finish 0.736 0.788 +0.052 455.587 462.612 +7.025 123/123 run 1/3 / run 2/3 14.25 14.25 P@40.3/P@43.0 P@40.3/P@42.6
2f7cbe2e minecraft-1.21.4-fabric-iris-bsl-in-world DirectVulkan nofinish 0.742 0.786 +0.044 462.639 454.128 -8.511 123/123 run 1/3 / run 1/3 14.25 14.25 P@41.5/P@42.6 P@40.7/P@42.2
2f7cbe2e minecraft-1.21.4-fabric-sodium-in-world DirectGLES finish 1.312 1.458 +0.146 2.370 2.554 +0.184 200/200 run 2/3 / run 1/3 15.64 13.52 P@41.5/P@42.2 P@41.1/P@42.2
2f7cbe2e minecraft-1.21.4-fabric-sodium-in-world DirectGLES nofinish 1.312 1.454 +0.142 2.423 2.524 +0.101 200/200 run 3/3 / run 2/3 15.64 13.52 P@41.1/P@42.2 P@40.3/P@42.2
2f7cbe2e minecraft-1.21.4-fabric-sodium-in-world DirectVulkan finish 0.477 0.504 +0.027 1.174 1.179 +0.005 200/200 run 3/3 / run 1/3 19.51 19.51 P@41.1/P@43.8 P@40.7/P@43.8
2f7cbe2e minecraft-1.21.4-fabric-sodium-in-world DirectVulkan nofinish 0.474 0.507 +0.033 1.158 1.150 -0.008 200/200 run 3/3 / run 3/3 19.51 19.51 P@41.5/P@43.8 P@40.7/P@42.2
2f7cbe2e minecraft-1.21.4-in-world DirectGLES finish 2.343 2.833 +0.490 5.272 5.674 +0.402 200/200 run 2/3 / run 3/3 9.4 7.44 P@40.7/P@41.1 P@41.8/P@41.8
2f7cbe2e minecraft-1.21.4-in-world DirectGLES nofinish 2.369 2.867 +0.498 5.281 5.752 +0.471 200/200 run 1/3 / run 1/3 9.4 7.44 P@40.3/P@42.2 P@41.8/P@42.6
2f7cbe2e minecraft-1.21.4-in-world DirectVulkan finish 1.034 1.148 +0.114 2.304 2.405 +0.101 200/200 run 1/3 / run 3/3 8.76 8.76 P@40.3/P@42.6 P@41.5/P@42.2
2f7cbe2e minecraft-1.21.4-in-world DirectVulkan nofinish 1.028 1.145 +0.117 2.270 2.419 +0.149 200/200 run 1/3 / run 3/3 8.76 8.76 P@40.3/P@42.6 P@40.3/P@42.2
2f7cbe2e minecraft-1.21.4-rd12-odinlite-in-world DirectGLES finish 8.315 11.223 +2.908 21.901 24.904 +3.003 200/200 run 2/3 / run 1/3 8.08 6.08 P@40.7/P@41.8 P@40.7/P@43.4
2f7cbe2e minecraft-1.21.4-rd12-odinlite-in-world DirectGLES nofinish 8.210 11.182 +2.972 21.778 24.804 +3.026 200/200 run 1/3 / run 2/3 8.08 6.08 P@40.7/P@43.4 P@40.7/P@42.6

GO/NO-GO reading (items 3-4: p50 and p99 per-thread CPU deltas must not be negative for the push arm, i.e. push must not cost more)

Windows where push costs MORE CPU than pull (d > 0):

  • 2f7cbe2e / improved-transparency-minecraft-26.3 / DirectGLES / finish: d p50 +1.593 ms, d p99 +0.167 ms
  • 2f7cbe2e / improved-transparency-minecraft-26.3 / DirectGLES / nofinish: d p50 +1.408 ms, d p99 +1.544 ms
  • 2f7cbe2e / improved-transparency-minecraft-26.3 / DirectVulkan / finish: d p50 +0.936 ms, d p99 +0.983 ms
  • 2f7cbe2e / improved-transparency-minecraft-26.3 / DirectVulkan / nofinish: d p50 +0.982 ms, d p99 +1.042 ms
  • 2f7cbe2e / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectGLES / finish: d p50 +0.080 ms, d p99 -2.466 ms
  • 2f7cbe2e / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectGLES / nofinish: d p50 +0.084 ms, d p99 +0.201 ms
  • 2f7cbe2e / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectVulkan / finish: d p50 +0.052 ms, d p99 +7.025 ms
  • 2f7cbe2e / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectVulkan / nofinish: d p50 +0.044 ms, d p99 -8.511 ms
  • 2f7cbe2e / minecraft-1.21.4-fabric-sodium-in-world / DirectGLES / finish: d p50 +0.146 ms, d p99 +0.184 ms
  • 2f7cbe2e / minecraft-1.21.4-fabric-sodium-in-world / DirectGLES / nofinish: d p50 +0.142 ms, d p99 +0.101 ms
  • 2f7cbe2e / minecraft-1.21.4-fabric-sodium-in-world / DirectVulkan / finish: d p50 +0.027 ms, d p99 +0.005 ms
  • 2f7cbe2e / minecraft-1.21.4-fabric-sodium-in-world / DirectVulkan / nofinish: d p50 +0.033 ms, d p99 -0.008 ms
  • 2f7cbe2e / minecraft-1.21.4-in-world / DirectGLES / finish: d p50 +0.490 ms, d p99 +0.402 ms
  • 2f7cbe2e / minecraft-1.21.4-in-world / DirectGLES / nofinish: d p50 +0.498 ms, d p99 +0.471 ms
  • 2f7cbe2e / minecraft-1.21.4-in-world / DirectVulkan / finish: d p50 +0.114 ms, d p99 +0.101 ms
  • 2f7cbe2e / minecraft-1.21.4-in-world / DirectVulkan / nofinish: d p50 +0.117 ms, d p99 +0.149 ms
  • 2f7cbe2e / minecraft-1.21.4-rd12-odinlite-in-world / DirectGLES / finish: d p50 +2.908 ms, d p99 +3.003 ms
  • 2f7cbe2e / minecraft-1.21.4-rd12-odinlite-in-world / DirectGLES / nofinish: d p50 +2.972 ms, d p99 +3.026 ms

Memo gates, residual bytes and CSO counters (last complete window, push arm)

  • 2f7cbe2e / improved-transparency-minecraft-26.3 / DirectGLES / finish: gates[ers=78960/1367 etl=75258/5069 eub=80327/0 mfp=0/0 mpm=0/0 mdt=0/0] resid=185.36 csom/csob=csom=0/csob=1157 mpr(last window/total)=0/8
  • 2f7cbe2e / improved-transparency-minecraft-26.3 / DirectGLES / nofinish: gates[ers=78960/1367 etl=75258/5069 eub=80327/0 mfp=0/0 mpm=0/0 mdt=0/0] resid=185.36 csom/csob=csom=0/csob=1157 mpr(last window/total)=0/8
  • 2f7cbe2e / improved-transparency-minecraft-26.3 / DirectVulkan / finish: gates[ers=0/0 etl=0/0 eub=0/0 mfp=10740/68928 mpm=67660/1268 mdt=78800/868] resid=185.36 csom/csob=csom=0/csob=1157 mpr(last window/total)=0/0
  • 2f7cbe2e / improved-transparency-minecraft-26.3 / DirectVulkan / nofinish: gates[ers=0/0 etl=0/0 eub=0/0 mfp=10740/68928 mpm=67660/1268 mdt=78800/868] resid=185.36 csom/csob=csom=0/csob=1157 mpr(last window/total)=0/0
  • 2f7cbe2e / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectGLES / finish: gates[ers=113/133 etl=80/166 eub=246/0 mfp=0/0 mpm=0/0 mdt=0/0] resid=370.67 csom/csob=csom=1/csob=122 mpr(last window/total)=0/2
  • 2f7cbe2e / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectGLES / nofinish: gates[ers=113/133 etl=80/166 eub=246/0 mfp=0/0 mpm=0/0 mdt=0/0] resid=370.67 csom/csob=csom=1/csob=122 mpr(last window/total)=0/2
  • 2f7cbe2e / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectVulkan / finish: gates[ers=0/0 etl=0/0 eub=0/0 mfp=0/177 mpm=86/91 mdt=81/96] resid=370.67 csom/csob=csom=1/csob=122 mpr(last window/total)=0/0
  • 2f7cbe2e / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectVulkan / nofinish: gates[ers=0/0 etl=0/0 eub=0/0 mfp=0/177 mpm=86/91 mdt=81/96] resid=370.67 csom/csob=csom=1/csob=122 mpr(last window/total)=0/0
  • 2f7cbe2e / minecraft-1.21.4-fabric-sodium-in-world / DirectGLES / finish: gates[ers=81/859 etl=244/696 eub=940/0 mfp=0/0 mpm=0/0 mdt=0/0] resid=171.8 csom/csob=csom=2/csob=811 mpr(last window/total)=0/1
  • 2f7cbe2e / minecraft-1.21.4-fabric-sodium-in-world / DirectGLES / nofinish: gates[ers=81/859 etl=244/696 eub=940/0 mfp=0/0 mpm=0/0 mdt=0/0] resid=171.8 csom/csob=csom=2/csob=811 mpr(last window/total)=0/1
  • 2f7cbe2e / minecraft-1.21.4-fabric-sodium-in-world / DirectVulkan / finish: gates[ers=0/0 etl=0/0 eub=0/0 mfp=0/657 mpm=109/548 mdt=0/657] resid=171.8 csom/csob=csom=2/csob=811 mpr(last window/total)=0/0
  • 2f7cbe2e / minecraft-1.21.4-fabric-sodium-in-world / DirectVulkan / nofinish: gates[ers=0/0 etl=0/0 eub=0/0 mfp=0/657 mpm=109/548 mdt=0/657] resid=171.8 csom/csob=csom=2/csob=811 mpr(last window/total)=0/0
  • 2f7cbe2e / minecraft-1.21.4-in-world / DirectGLES / finish: gates[ers=6020/1850 etl=6411/1459 eub=7870/0 mfp=0/0 mpm=0/0 mdt=0/0] resid=178.31 csom/csob=csom=2/csob=1719 mpr(last window/total)=0/0
  • 2f7cbe2e / minecraft-1.21.4-in-world / DirectGLES / nofinish: gates[ers=6020/1850 etl=6411/1459 eub=7870/0 mfp=0/0 mpm=0/0 mdt=0/0] resid=178.31 csom/csob=csom=2/csob=1719 mpr(last window/total)=0/0
  • 2f7cbe2e / minecraft-1.21.4-in-world / DirectVulkan / finish: gates[ers=0/0 etl=0/0 eub=0/0 mfp=0/7278 mpm=6030/1248 mdt=5928/1350] resid=178.31 csom/csob=csom=2/csob=1719 mpr(last window/total)=0/0
  • 2f7cbe2e / minecraft-1.21.4-in-world / DirectVulkan / nofinish: gates[ers=0/0 etl=0/0 eub=0/0 mfp=0/7278 mpm=6030/1248 mdt=5928/1350] resid=178.31 csom/csob=csom=2/csob=1719 mpr(last window/total)=0/0
  • 2f7cbe2e / minecraft-1.21.4-rd12-odinlite-in-world / DirectGLES / finish: gates[ers=16038/224 etl=16104/158 eub=16262/0 mfp=0/0 mpm=0/0 mdt=0/0] resid=162.91 csom/csob=csom=0/csob=209 mpr(last window/total)=0/0
  • 2f7cbe2e / minecraft-1.21.4-rd12-odinlite-in-world / DirectGLES / nofinish: gates[ers=16038/224 etl=16104/158 eub=16262/0 mfp=0/0 mpm=0/0 mdt=0/0] resid=162.91 csom/csob=csom=0/csob=209 mpr(last window/total)=0/0
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