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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

5.1 KiB

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P5 包通用前言 — 每个包开工前必读

你在哪、读什么

集成树 ~/w7/pipe，分支 feat/disaggregated。不要直接在里面干活。 你的工作树：cd ~/w7/pipe && git worktree add ~/w7/p5-<你的 slug> -b p5/<你的 slug> refs/heads/feat/disaggregated
契约优先于 brief：MobileGL/MG_Remote/CONTRACT-P5.md（表 0/1/2/3 + 全部裁定）。
brief：~/w7/notes/p5/BRIEF-P5.md（裁定 R-1…R-15；§12 是契约包落地后的 14 处更正，先读它）。
契约包的报告：~/w7/notes/p5/p5-results/c0-v1.md（尤其 §5 每个桩签名的理由、§6 brief 的 14 处错）。
verb 普查（实测）：~/w7/notes/p5/verb-census.md。
侦察八份：~/w7/notes/p5/scout-*.md，全部 file:line 可复核。
集成者决策：~/w7/notes/p5/INTEGRATOR-DECISIONS.md。
计划底本：~/w7/pipe/docs/Disaggregated/{ARCHITECTURE,ROADMAP,MEASUREMENTS}.md。

第一天必踩的两个坑

worktree 的 submodule 是符号链接（git worktree add 不带 submodule 内容，递归 init 要联网，本地对象库里没有 apitrace 的 brotli 树）。~/w7/p5-c0-setup.sh 会把每个 .gitmodules 路径链过去（包括 include/ska，Includes.h:53 要它）。 git 在它们是符号链接时会整个拒绝运行（"expected submodule path X not to be a symbolic link"），所以：跑任何 git 命令之前 ~/w7/p5-c0-submodlinks.sh off，跑构建之前 on。
任何报构建结果的脚本，先确认 CTestTestfile.cmake 存在再相信它。 一个早期 bring-up 脚本丢了 $COMMON、构建循环没传目录，cmake --build -j 24 只打印用法而 $?=0，于是报了四个从没发生过的"绿"构建。

构建配方

export CCACHE_BASEDIR=/home/swung/w7
COMMON="-G Ninja -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ \
 -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
 -DCMAKE_BUILD_TYPE=Release -DMOBILEGL_LOG_ACTIVE_LEVEL=MOBILEGL_LOG_LEVEL_INFO \
 -DMOBILEGL_BUILD_TEST=ON -DMOBILEGL_BUILD_INTEGRATION_TEST=ON -DMOBILEGL_BUILD_BENCHMARK=OFF \
 -DMOBILEGL_ITEST_EGL_VENDOR=/usr/share/glvnd/egl_vendor.d/50_mesa.json \
 -DMOBILEGL_ITEST_VK_ICD=/usr/share/vulkan/icd.d/lvp_icd.json \
 -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_POLICY_VERSION_MINIMUM=3.5"
export GLIBC_TUNABLES=glibc.malloc.tcache_count=0      # ID-18/21：让退出顺序 UAF 原生复现

pull = 无额外 flag；push = -DMOBILEGL_PIPE_PUSH=ON； verify = -DMOBILEGL_PIPE_VERIFY=ON -DMOBILEGL_ITEST_REQUIRE_GPU=ON； split = -DMOBILEGL_PIPE_PUSH=ON -DMOBILEGL_BUILD_DISAGGREGATED=ON -DMOBILEGL_BUILD_DISAGGREGATED_INPROC=ON。（DISAGGREGATED 现在蕴含 PIPE_PUSH，INPROC 蕴含 DISAGGREGATED。）
构建 -j 24。~/w7/p5-c0-gate.sh 是一个可抄的骨架（四个目录 + 生成器 + 纯度 + G1 + 四条 unit 车道）。

每个包都要自测的四件事

G1：python3 scripts/symbol_report.py（照 ~/w7/notes/tools/wsl_p4a_gate.sh 的调法， --threshold 0）对 ~/w7/p5-before-libMobileGL.so，必须 0 增 / 0 删 / 0 resize / 0 重命名、.text +0。 这是 P5 最容易破的门：新计数器一律放进 #if MOBILEGL_PIPE_PUSH 块内；任何会出现在 pull 构建里的新代码、新字符串、新 Features 成员都可能移动符号。
ctest -L unit 在 pull / push / verify / split 四个目录（基线 1785/1785/1785 与 split 1842/1842）。
ctest -L integration-gpu 在 build-push 与 MOBILEGL_TRANSPORT=monolith 下 1117/1117，且与 ~/w7/p5-before-ctest-names.txt 逐名相同（G2/G14）。
python3 scripts/gen_pipe.py --check（若你碰了任何 .def 或生成器——多半你不该碰，见所有权表）。

铁律

提交信息 [Type] (Scope): description，单行，绝不加 Co-Authored-By 或任何署名行。
不要改别的包拥有的文件（所有权表在 BRIEF §5 + §12 的补充）。需要改，向集成者提。
目录行的 opcode 永不移动；新调用追加，退役的调用保留槽位。
不要拉 GitHub LFS。fixture 只用本地已 hydrate 的（openra.tgz 是唯一 hydrate 的那个）。
不要碰任何 adb 设备。
临时文件：中间日志放 ~/w7/ 并带 p5-<slug>- 前缀，收工时只留报告引用的那几个。 别在别的任务正在写日志时用通配 rm。
绝不把源文件通过"引号 heredoc 套引号 heredoc"写出去——会静默写进字面量 \n。用 Write/Edit 工具，或脚本文件里的单层 heredoc。
性能按 2026-09-08 的规则：只记录，不设门。P5 预期变慢（R-1 的栅栏税），这不是回归。

收工

在你的分支上提交（多个单行提交没问题）。
写 ~/w7/notes/p5/p5-results/<slug>-v1.md：落了什么、每一条 brief/契约没做的裁定（带证据 + 推翻它需要什么）、四件自测的数字、你认为 brief 或契约错了的地方、以及留给后续阶段的账。
返回 ≤200 词：提交区间、验收数字、其他包最需要知道的三件事。

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