| Commit message (Collapse) | Author | Age |
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The final cuCtxCreate stall is a UVM tracking semaphore whose completed
value stays 0; the pool payload is the ground truth. semfix now prints
idx/+0x10/+0x28/payload for every tracking sem it sees, whenever a field
changes, so the last stall before a failure is visible in its log.
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Under load the semfix poll grepped the whole (growing) trace file and the
track_waits push block spawned three guest processes per sample, both of
which slowed the pin path into the client's failure window. The trace read
now tails 128 KB; track_waits.sh gates the push dump behind PUSH=0; the
pagemap helper reads 32 KB chunks.
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Two fixes for the CE data path. (1) svc_handle_map_add rewound every
channel by 8 ring entries on every injected mapping; a 16 MB push-buffer pin
is thousands of page injections, so the pump's last_get was pinned in place
and it re-read the same entries for the whole batch (3645 submissions, zero
ops). The rewind now runs once per drained batch. (2) The push-start
heuristic (op=INC_METHOD at address 0) rejects UVM's real CE memop pushes,
which start with an IMM method at address 8 (observed 0x60020002, PTE data
words) or a release method at 0x700 (0x200381c0); a buffer read through a
host-injected (ipin) translation is now decoded fully trusted, ops included.
Result on the next boot: memset=2718/0/0 ringops=1794 (first sustained CE
work), false 12k->1.9k. semfix_watch: bulk-pin contiguous runs via
sema_map_add len, read rm_mem size, 16 MB (4096 page) cap, non-blocking QMP
read (the fixed 30 ms sleep made 4096 gva2gpa calls take two minutes), and
KEEP_TRACE=1 to preserve the guest trace for post-mortems.
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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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candidates)
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GPA layout)
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injector marker-based handle discovery
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