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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.
44 lines
5.3 KiB
Markdown
44 lines
5.3 KiB
Markdown
# P2 paired A/B - per-thread CPU per frame (ms), trailing window, push - pull
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pin columns: before/after verdict per run (P=PINNED, D=DRIFT = a cluster clamped by thermal management, U=UNPINNED) @ cpuss temperature C
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| device | case | backend | mode | pull p50 | push p50 | d p50 | pull p99 | push p99 | d p99 | frames | pull acc/draw | push acc/draw | pin pull | pin push |
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| 35d0befa | improved-transparency-minecraft-26.3 | DirectGLES | finish | 37.282 | 42.583 | +5.301 | 54.933 | 60.636 | +5.703 | 200/200 | 8.39 | 8.39 | P@52.5/P@53.2 | P@52.1/P@53.2 |
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| 35d0befa | improved-transparency-minecraft-26.3 | DirectGLES | nofinish | 38.691 | 42.436 | +3.745 | 57.099 | 60.409 | +3.310 | 200/200 | 8.39 | 8.39 | P@50.9/P@53.2 | P@52.1/P@52.5 |
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| 35d0befa | improved-transparency-minecraft-26.3 | DirectVulkan | nofinish | incomplete: pull |
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| 35d0befa | minecraft-1.21.4-fabric-iris-bsl-in-world | DirectGLES | finish | 4.946 | 5.370 | +0.424 | 2320.752 | 2322.192 | +1.440 | 123/123 | 40.95 | 40.95 | P@49.8/P@48.6 | P@49.8/P@50.5 |
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| 35d0befa | minecraft-1.21.4-fabric-iris-bsl-in-world | DirectGLES | nofinish | 4.983 | 5.459 | +0.476 | 2320.379 | 2318.561 | -1.818 | 123/123 | 40.95 | 40.95 | P@49.8/P@50.2 | P@49.0/P@50.9 |
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| 35d0befa | minecraft-1.21.4-fabric-iris-bsl-in-world | DirectVulkan | finish | 4.769 | 4.611 | -0.158 | 1886.629 | 1657.190 | -229.439 | 123/123 | 14.25 | 14.25 | P@50.5/P@50.9 | P@51.7/P@50.5 |
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| 35d0befa | minecraft-1.21.4-fabric-iris-bsl-in-world | DirectVulkan | nofinish | 4.158 | 4.525 | +0.367 | 1604.480 | 1624.190 | +19.710 | 123/123 | 14.25 | 14.25 | P@50.2/P@51.3 | P@50.9/P@52.9 |
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| 35d0befa | minecraft-1.21.4-in-world | DirectGLES | finish | 7.463 | 8.363 | +0.899 | 10.661 | 11.609 | +0.948 | 200/200 | 9.4 | 9.4 | P@49.0/P@44.0 | P@46.3/P@48.6 |
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| 35d0befa | minecraft-1.21.4-in-world | DirectGLES | nofinish | 7.392 | 8.377 | +0.986 | 11.086 | 11.581 | +0.495 | 200/200 | 9.4 | 9.4 | P@47.1/P@46.7 | P@44.4/P@46.7 |
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| 35d0befa | minecraft-1.21.4-in-world | DirectVulkan | finish | 5.237 | 5.842 | +0.605 | 6.767 | 7.380 | +0.613 | 200/200 | 8.76 | 8.76 | P@49.8/P@50.2 | P@49.8/P@51.3 |
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| 35d0befa | minecraft-1.21.4-in-world | DirectVulkan | nofinish | 5.424 | 5.851 | +0.427 | 6.979 | 7.405 | +0.426 | 200/200 | 8.76 | 8.76 | P@47.8/P@50.2 | P@49.4/P@50.9 |
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## 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)
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Windows where push costs MORE CPU than pull (d > 0):
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- 35d0befa / improved-transparency-minecraft-26.3 / DirectGLES / finish: d p50 +5.301 ms, d p99 +5.703 ms
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- 35d0befa / improved-transparency-minecraft-26.3 / DirectGLES / nofinish: d p50 +3.745 ms, d p99 +3.310 ms
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- 35d0befa / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectGLES / finish: d p50 +0.424 ms, d p99 +1.440 ms
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- 35d0befa / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectGLES / nofinish: d p50 +0.476 ms, d p99 -1.818 ms
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- 35d0befa / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectVulkan / nofinish: d p50 +0.367 ms, d p99 +19.710 ms
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- 35d0befa / minecraft-1.21.4-in-world / DirectGLES / finish: d p50 +0.899 ms, d p99 +0.948 ms
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- 35d0befa / minecraft-1.21.4-in-world / DirectGLES / nofinish: d p50 +0.986 ms, d p99 +0.495 ms
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- 35d0befa / minecraft-1.21.4-in-world / DirectVulkan / finish: d p50 +0.605 ms, d p99 +0.613 ms
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- 35d0befa / minecraft-1.21.4-in-world / DirectVulkan / nofinish: d p50 +0.427 ms, d p99 +0.426 ms
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## Memo gates, residual bytes and CSO counters (last complete window, push arm)
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- 35d0befa / improved-transparency-minecraft-26.3 / DirectGLES / finish: gates[ers=78960/1367 etl=75378/4949 eub=75199/5128 mfp=0/0 mpm=0/0 mdt=0/0] resid=185.36 csom/csob=csom=0/csob=1157
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- 35d0befa / improved-transparency-minecraft-26.3 / DirectGLES / nofinish: gates[ers=78960/1367 etl=75378/4949 eub=75199/5128 mfp=0/0 mpm=0/0 mdt=0/0] resid=185.36 csom/csob=csom=0/csob=1157
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- 35d0befa / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectGLES / finish: gates[ers=113/133 etl=85/161 eub=82/164 mfp=0/0 mpm=0/0 mdt=0/0] resid=370.67 csom/csob=csom=1/csob=122
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- 35d0befa / minecraft-1.21.4-fabric-iris-bsl-in-world / DirectGLES / nofinish: gates[ers=113/133 etl=85/161 eub=82/164 mfp=0/0 mpm=0/0 mdt=0/0] resid=370.67 csom/csob=csom=1/csob=122
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- 35d0befa / 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
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- 35d0befa / 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
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- 35d0befa / minecraft-1.21.4-in-world / DirectGLES / finish: gates[ers=6020/1850 etl=6884/986 eub=6962/908 mfp=0/0 mpm=0/0 mdt=0/0] resid=178.31 csom/csob=csom=2/csob=1719
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- 35d0befa / minecraft-1.21.4-in-world / DirectGLES / nofinish: gates[ers=6020/1850 etl=6884/986 eub=6962/908 mfp=0/0 mpm=0/0 mdt=0/0] resid=178.31 csom/csob=csom=2/csob=1719
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- 35d0befa / 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
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- 35d0befa / 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
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