| Commit message (Collapse) | Author | Age |
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A fresh boot can leave /sys/kernel/tracing as an unmounted mount point;
the probe adds then fail silently (probe count 0) and the whole sem/kptr
pipeline goes blind.
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The client's spin floods the default ring with uvmt/uvsv events; a one-shot
uvbp event was overwritten before the pin scanner read it (push-buffer pin
landed ~50 s after the client began pushing). 64 MB ring + clear.
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uvsv/uvsvr capture (sem, value) and the boolean return of
uvm_gpu_tracking_semaphore_is_value_completed, so a wait that fails despite
an advanced payload is visible as a false return.
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The failing wait is uvm_tracker_wait_for_entry inside channel_pool_add
(UVM_GPU_REGISTER): capture the tracker entry's channel pointer and value so
the host can tell which release value is still missing.
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The CE push-buffer page 0x120000000 resolved to a zero-filled page even after
sema_map_add injected the correct translation: the shared pin table silently
dropped inserts once a hash cluster exceeded the 32-probe window (the page
hashes to slot 0, a hot cluster), and lookups fell through to the
content-scanned map and answered with a stale page - so every CE push read as
implausible and memset stayed 0. Injected translations now live in a separate
authoritative table checked before every other source and are never written by
self-discovery; the general pin table is 4x larger with a 4x probe window and
counts drops (pin_drop/ipin_drop) in the stats line. guest_kprobes.sh disables
the kprobe group before removal (EBUSY) and matches p:kprobes/<name>; the
guest wait sampler can run counters-only with GDB=0.
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chunk-read diagnostics
semfix_watch.py now resolves the CE pushbuffer from guest truth instead of
scanning a wide raw window: it walks uvm_channel_t +0=pool, pool+0=manager,
manager+8=pushbuffer, pushbuffer+8=rm_mem, rm_mem+0x10=vas[] and prefers the
rm_mem whose GPU VA is in the 0x120000000 CE pushbuffer range. Three entry
points: uvch probe on __uvm_push_begin_acquire_on_channel_with_info, uvbp
probe on uvm_pushbuffer_begin_push, and the uvmt tracking-sem kptr (channel
scan back from sem). Misses now print structured hop counters so a failed
chunk read is distinguishable from a failed chain. guest_kprobes.sh
(re)installs uvmt/uvch/uvbp/uvpbf after every guest boot (plain, module:
and bare spellings).
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