From 6d380a3c3f5cc3cac1fb3bea913b18bbfb1f3a13 Mon Sep 17 00:00:00 2001
From: Arthur Hanson Rasmusson <arthur@vgpu.io>
Date: Tue, 29 Sep 2026 21:41:26 -0400
Subject: guest-diag: one-shot gdb/state samplers for timed post-control
 captures

gdb_now.sh attaches once at a host-chosen moment (final RM control) and dumps
all threads; oneshot_gdb.sh triggers on user-running state; state_log.sh
records state/syscall/wchan so kernel busy-waits can be told apart from real
userspace spins.
---
 tools/guest-diag/state_log.sh | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 tools/guest-diag/state_log.sh

(limited to 'tools/guest-diag/state_log.sh')

diff --git a/tools/guest-diag/state_log.sh b/tools/guest-diag/state_log.sh
new file mode 100644
index 0000000..de3d6ed
--- /dev/null
+++ b/tools/guest-diag/state_log.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+# state_log.sh <pid> - 200ms sampler of state/syscall/wchan for the whole run.
+PID="$1"
+: > /tmp/state.log
+while kill -0 "$PID" 2>/dev/null; do
+    st=$(awk '{print $3}' /proc/$PID/stat 2>/dev/null)
+    sc=$(cat /proc/$PID/syscall 2>/dev/null | cut -d' ' -f1-3)
+    wc=$(cat /proc/$PID/wchan 2>/dev/null)
+    echo "$(date +%T.%3N) st=$st sc=[$sc] wchan=$wc" >> /tmp/state.log
+    sleep 0.2
+done
+echo "$(date +%T.%3N) GONE" >> /tmp/state.log
-- 
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