* perf: answer Turnip's zero-timeout KGSL timestamp polls without blocking
Turnip polls a timeline point with IOCTL_KGSL_DEVICE_WAITTIMESTAMP_CTXTID
and a timeout of 0, which KGSL reads as wait forever; Mesa does it under
a lock on every signalling submit, so vkd3d-proton, DXVK, gamescope and
Zink ran in lock-step with the GPU. The session preload now answers
those polls from the context's retired timestamp and passes everything
else to the kernel. Bannerlator measured a D3D12 demo at 614 -> 4335 fps
with the same answer in its Vulkan adapter. BL_NO_KGSL_POLL_FIX=1 turns
it off.
* perf: frame limiter, live panel refresh, opt-in GPU clock pin, cheaper cursor sync
- A per-mode frame limit (Steam and desktop settings, off by default):
gamescope's -r, the compositor's buffer-release pacer, the display
layer's frame-rate vote and a panel mode the cap divides evenly, as
WinNative's per-shortcut limit does. BL_FPS was always 0 and the
pacer's limit was never set.
- The compositor follows the panel's refresh rate when it changes
mid-session instead of reporting the rate read at start. (WinNative.)
- Performance > GPU: hold the Adreno clock at its top through KGSL's
power-control property, no root (Bannerlator's PerfGpuTurbo). Off by
default; cleared when the session stops and at the next app start if
a killed process left it set.
- The cursor image is copied across JNI only when its serial changes,
not on every pointer move.
* perf: stop re-seeding every prefix every 5 s, and run the library helpers only on change
- bannerlator-seed-redists stamped its change check from a block that
carried the current time, so it never matched: every prefix had ~32
keys appended to system.reg on every beat. The stamp now comes from
the names; Proton's prefix template is seeded too (date kept), with
WinNative's built-in list until the client has the install scripts.
- The library beat runs the seeder every 15 s and steam-compat only
when a directory it reads has changed, or once a minute.
- The client-core pin reads /proc itself and runs taskset -a only for
new processes or ones that grew threads.
- The games watcher backs off after a failed ownership probe and does
not probe while a game runs.
- The Proton launcher runs the newest ARM64 depot by build number, and
PROTON_USE_PIPEWIRE defaults to 0. (WinNative.)
* perf: Mesa's database shader cache, and proot's tracer above the guest
- MESA_DISK_CACHE_DATABASE=1 for the session: the file cache opens a
file per lookup and opens and renames one per store, each a proot
stop; the database is opened once and used with pread/pwrite.
- proot's single tracer thread is raised to nice -6 (under the
compositor's -8) two seconds after it starts, so the first guest
process it forks keeps nice 0. setpriority() directly, not
Process.setThreadPriority, which would also move its cgroup.
* feat: stand in for /dev/uinput so Steam Input's virtual pads reach games
* feat: present the pad to the Steam client as a Steam Deck controller over hidraw
* docs: log the uinput stand-in and the Steam Deck controller
* feat: feed the handheld's gyro and accelerometer to the Steam Deck controller
* feat: let the Steam page choose between the Steam Deck controller and the Xbox 360 pad
* feat: Deck back grips and trackpads on the second screen
* fix: serialize ring teardown with its writers, fall back to the Xbox pad when the Deck cannot be set up, and read motion only for a Deck
* fix: keep the second screen's choice through sleep and bring it back on wake
mangoapp's VRAM figure on a Qualcomm driver comes only from the gpu_mem_total
trace event. The tracefs stand-in's event list now declares that event as
Android kernels do, and reading the stand-in's events answers with one
record carrying the total KGSL reports in /sys/class/kgsl/kgsl/page_alloc,
which every Adreno under Android has and the app can read.
Three things kept Valve's mangoapp from drawing the overlay in a session:
- GLFW 3.4 takes XDG_SESSION_TYPE=wayland with WAYLAND_DISPLAY set as
Wayland-only, and mangoapp needs gamescope's X server; the wrapper sets
XDG_SESSION_TYPE=x11.
- On a Qualcomm display driver it opens a tracefs instance for the GPU memory
total and aborts when that fails, which it always does for an Android app.
The session preload now places the instance in an empty directory of its own
when the real one cannot be made.
- gamescope sends it each frame's timings through a System V message queue,
and Android kernels have no System V IPC. sysv.c now emulates the queue
operations gamescope and mangoapp use, beside its semaphores and shared
memory.
The session's proot runs with -i <app uid>, and the rootfs names that uid
root, so the client calls itself root while geteuid() returns the app's
uid. The read-only retry required geteuid() == 0 and never ran: the
Proton Experimental (ARM64) update still failed with Missing file
permissions on wineopenxr.dll (2026-09-26 16:07, 2,471 read-only files).
Also recognise the client by the path it was started by: the kernel's
/proc/self/exe names proot's loader for every process in the session.
The client runs as proot's root, which the kernel does not see, and
leaves many content files read-only; an update that rewrites one was
refused (EACCES) and cancelled with "Missing file permissions"
(Proton Experimental (ARM64), wineopenxr.dll). For the client's own
processes, a refused write-open of a file the app owns now gets the
owner's write bit - on the file, or on the directory a new file goes
into - and one more try. Games and Wine keep ordinary permissions.
From Bannerlator's feat/linux-gamescope-runtime since this repo was cut:
- Session teardown (4509d788): proot was SIGKILLed, which never lets its
--kill-on-exit cleanup run; its tracees lived on with no tracer, every
seccomp-trapped syscall failing with ENOSYS, spinning at a full core for over
an hour. Now SIGTERM, a grace for proot's own cleanup, SIGKILL only if it
will not go, then a sweep of the tree it had — snapshotted first, each pid
checked against its start time.
- The Steam client's controller interposer is its own source
(fakeinput_steam.cpp, 28922e7c), separate from the one preloaded into Wine.
- The seeder runs on a beat so a prefix the client creates mid-session is
covered before its install scripts run (6ee86bff).
- GE-Proton and proton-cachyos as compatibility tools: the registrar
bannerlator-proton-extra and the compat script's adopt_extras (03867656).
- space.c in the session shim: a library's own free space, not the phone's.
The env-vs-args ordering bug (98d38931) does not apply here: nothing is added
after the script name.
Lifts Bannerlator's Linux/gamescope runtime out into an app of its own: the
Wayland compositor, the proot session, the runtime installer, the fake-evdev
controller path and the PulseAudio server, with none of the Wine, container or
store machinery around them.
One activity installs the runtime from the same winlator-contents catalog and a
second one runs the session: compositor on a SurfaceView, gamescope and Valve's
native arm64 client under proot, a physical pad republished into the fake-input
rings, and the session's milestones on screen until the first frame arrives.
xXJsonDeruloXx