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| author | Arthur Hanson Rasmusson <arthur@vgpu.io> | 2026-09-30 12:54:11 -0400 |
|---|---|---|
| committer | Arthur Hanson Rasmusson <arthur@vgpu.io> | 2026-09-30 12:54:11 -0400 |
| commit | d3e35752e8d78a368940fc262b0013e1d50deed4 (patch) | |
| tree | 89ef9a563768211381693dcb3debeb24cb8482de /kernel/gsp_sema_service.h | |
| parent | 4ce77f9c375d2da7288d8d563c639f14df3948be (diff) | |
| download | open-iov-d3e35752e8d78a368940fc262b0013e1d50deed4.tar.gz open-iov-d3e35752e8d78a368940fc262b0013e1d50deed4.zip | |
sema-svc: gate per-push/per-doorbell/RPC tracing behind default-off sema_dbg
A healthy run left dmesg dominated by per-operation lines (sema-push,
sema-lda, sema-chan rel-apply, sema-grce, DOORBELL/BAR writes, GSPRM
per-RPC lines, the teardown garbage-element stream). Introduce the
module parameter sema_dbg (default 0) and route every high-frequency
diagnostic through it; the finer-grained watch knobs (sema_ops_log,
sema_copy_watch, sema_copy_pat, sema_copy_dst, sema_copy_dst2) only
take effect while it is on. Boot stats, channel registrations, pin
events and state changes stay unconditional.
Also carries the per-side translation provenance (op_tr_src, printed
as prov= in the destination-window watch) and the 16 KB destination
window used to observe the guest's page-table writes.
Verified: fresh boot + full cdt2 smoke test (64/64, ALL OK) leaves a
520-line dmesg with zero per-push/per-doorbell/per-RPC lines.
Diffstat (limited to 'kernel/gsp_sema_service.h')
| -rw-r--r-- | kernel/gsp_sema_service.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/gsp_sema_service.h b/kernel/gsp_sema_service.h index 51397b9..baed3cf 100644 --- a/kernel/gsp_sema_service.h +++ b/kernel/gsp_sema_service.h @@ -80,6 +80,13 @@ extern bool gsp_sema_gr_rings; extern bool gsp_sema_fake_rel; /* + * Master diagnostic switch for the per-push/per-doorbell/per-op tracing + * (module parameter sema_dbg). Off by default so a healthy boot leaves the + * kernel log quiet; the watch knobs below only take effect while it is on. + */ +extern bool gsp_sema_dbg; + +/* * Skip executing a push's collected work (CE memsets/copies) while still * applying its release; see the definition for the trade-off. */ @@ -103,6 +110,9 @@ extern u64 gsp_sema_copy_pat; /* Data-path watch: dump copies landing in this page (source bytes). */ extern u64 gsp_sema_copy_dst; +/* Second destination window for the same watch (0 = off). */ +extern u64 gsp_sema_copy_dst2; + /* CE pending-entry grace window in ms before the release fallback fires. */ extern unsigned gsp_sema_ce_grace_ms; |