| Commit message (Collapse) | Author | Age |
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vmrestart reaps stale watchers
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- the trace tail (subprocess + 256KB read) ran inside the scan loop and
blocked it for seconds exactly when the client's GR window appeared;
moved to a background thread whose queue the loop drains.
- scan interval 250ms -> 100ms.
- track_waits sampler also dumps 512 raw bytes at page+0xe00 each sample:
the per-slot reads disagreed with the bulk dump within one sample
because host writes land between the two, and the raw dump is the only
trustworthy view of the slot layout.
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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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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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injector, wait sampler
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