A registered range larger than 64 MiB is imported one 64 MiB window at a
time for buffer and fill accesses instead of whole, and the live imports
stay under a budget: APS5_HOST_IMPORT_MIB, else the larger of 6 GiB and
half the physical memory, at most the largest host heap less 2 GiB
(imports and type-3 mirrors share it; #167's rule). An import past the budget
retires the least recently used imports not used in the last 256
lookups.
- An access across window edges imports the cells it touches, grown to
the union of the range's imports it overlaps, so uses across
neighbouring edges share one import instead of replacing each other.
- An address-based build (AcquireRegistered) imports the range whole; a
window over its first byte does not serve it.
- Every refusal (alignment, a failed run, a held import, the budget with
what may be evicted) is decided before anything is retired.
- An import made when a range is mapped never evicts: the map observer
holds no GPU lock.
The window size and the budget have setters for the tests.
The mimalloc in PS5MC (PPSA99420) reads vm.overcommit at start-up and
stopped on the unsupported name. It reports FreeBSD's default, 0.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The dolphin_libretro core of RetroArch (PPSA99169) reads {CTL_HW,
HW_REALMEM} as the machine's memory size and stopped on the unsupported
MIB. It reports the same value as hw.physmem.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
PS5CEMU-HAR (PPSA99360, ps5-payload-dev build, relinks with
--trap-sdk-syscall-stubs) imports the data objects sys_siglist
(yCdGspbNHZ8) and sys_nsig (ZD+Dp+-LsGg) from libSceLibcInternal.prx;
the import audit lists both as absent (registry entries 364 and 378,
after pthread_setaffinity_np at 276). No run has reached them yet; the
predicted stop line is
FAIL: unresolved ELF import ZD+Dp+-LsGg (sys_nsig) from libSceLibcInternal.prx
or yCdGspbNHZ8 (sys_siglist), whichever the loader resolves first.
The table and count are FreeBSD 11.4 lib/libc/gen/siglist.c (8c639945):
32 descriptions, signal 0 to SIGUSR2 (NSIG 32), and sys_nsig is their
number, 32. ps5-payload-dev declares both as objects exported by
libSceLibcInternal and its strsignal reads them.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The entry links WindowsMappings.hpp, so the debt-file convention puts it in
docs/dev/debt/libc.md.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V1W4jdNSKTV7xwuS6xQPJV
A direct memory page mapped at one guest address now lives in private
MEM_WRITE_WATCH memory at that address, and its writes are collected with
GetWriteWatch like flexible memory: no fault is raised. A page mapped at a
second address moves its whole resident run into the section, behind a
read-only fence while it is copied, and every address becomes a view of it,
tracked by write protection. Unmapped resident pages that are not blank are
kept in a private reservation until they are mapped again, not in the
section.
Ported onto main's 4 KiB subpage tracking of shared views: resident runs
keep a per-page collected bit and enter the fresh ranges, so Fresh and
Armed collections select them like shared views; a demoted run carries its
collected bits into the views and reports every page once. MapAlias throws
through refuse() when a resident run extends outside the aliased range, and
the caller keeps main's fallback.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V1W4jdNSKTV7xwuS6xQPJV
A bound buffer is joined across adjacent registered ranges only when every
one of them is larger than the 8 MiB window. PPSA25344's loading binds 16 MiB
and 4 MiB buffers whose backing was registered in two to six adjacent
pieces with the same access, some of them smaller than the window, so each
use of such a buffer was copied on the CPU: up to 348 GB in the first 300 s
of loading.
A bound buffer that starts at the first crossed range's start and ends at the
last one's end now joins those ranges whatever their size. A heap grown in
pieces matches that only for a binding over exactly its current pieces, so
growth beside a joined import does not re-import it. joinedCovers, used when a
joined import retires, accepts any adjacent run of ranges.
importJoinTests binds exactly over two 64 KiB pieces of a partly filled
window and requires one import of both; a binding across them that starts
inside the first piece stays apart.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The 9-word kernel #3816 matches stores one dword per thread, loaded with
s_buffer_load_dword through the descriptor in user[4..7]. Run as a
compute dispatch, its stores are pending writes of unknown value, so a
later read of DCC keys in that range waits for the GPU.
fillBuffer now takes it as a uniform buffer fill when all of these hold:
- the output descriptor's format is 32_UINT, 32_SINT or 32_FLOAT (20-22),
so buffer_store_format_x stores the loaded dword unchanged;
- the value descriptor covers the loaded dword: num_records times the
stride (num_records alone when the stride is 0) is at least 4 bytes,
the range the recompiler gives a scalar buffer load;
- exactly 8 user SGPRs and group id X enabled, so the group id is s8;
- a direct, non-partial dispatch, 64x1x1 threads, one group in Y and Z,
and a 16-byte aligned range of whole 16-byte units.
The value is read when the fill is recorded, after the labels queued
before it, as the pattern-fill kernel's source is. When the value is one
byte repeated and that byte is a DCC key code, the fill goes into the GPU
key-store memo whatever ClassifyFill reports: the memo answers a key
read only while this fill is still the newest pending write over the
keys, and a fill over a color target's keys is not a storage image's
keys fill.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
swscanf (HNnWdT43ues) runs the swscanf_s scanner without the buffer
size arguments after %s, %c and %[, as FreeBSD's swscanf.c passes its
arguments to vswscanf. Both entry points share one engine with a flag
for the sizes; swscanf_s behaves as before.
Title: PS5CEMU-HAR PPSA99360 imports swscanf from libSceLibcInternal.prx
(import audit with --trap-sdk-syscall-stubs, registry index 292, right
after pthread_setaffinity_np at 276). Predicted stop line once
pthread_setaffinity_np resolves, without this change:
FAIL: unresolved ELF import HNnWdT43ues (swscanf) from libSceLibcInternal.prx
NID from tools/nid_names.py, confirmed in shadPS4 aerolib.inl:51950
(e0a466753a1a). Prototype in ps5-payload-dev include/freebsd/wchar.h:133,
export in sce_stubs/libSceLibcInternal.c:8582 (f5d40f02770e).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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