diff options
Diffstat (limited to 'tools/guest-diag/inject_counters.sh')
| -rwxr-xr-x | tools/guest-diag/inject_counters.sh | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/tools/guest-diag/inject_counters.sh b/tools/guest-diag/inject_counters.sh index 8a56558..d1d004c 100755 --- a/tools/guest-diag/inject_counters.sh +++ b/tools/guest-diag/inject_counters.sh @@ -52,10 +52,18 @@ fi b64=$(base64 -w0 "$HERE/sem_counters.py") timeout 30 "$VMEXEC" exec "echo '$b64' | base64 -d > /tmp/sem_counters.py" >/dev/null +# Only consider chan_dump lines produced after this script's own trigger: +# dmesg keeps the previous client's dump lines (and handles) forever, and the +# ring buffer wraps so a line-count baseline is not a stable cursor. Write a +# unique marker to /dev/kmsg before each dump and parse only lines after it. +DMESG_MARK="sema-inject-marker-$$-$(date +%s)" + all_grs() { + echo "$DMESG_MARK" | sudo tee /dev/kmsg >/dev/null echo 1 | sudo tee "$PARAM/chan_dump" >/dev/null sleep 1 - sudo dmesg | grep -o 'sema-chan-dump: h=0x[0-9a-f]* eng=0' \ + sudo dmesg | awk -v m="$DMESG_MARK" 'index($0, m) { f = 1; next } f' \ + | grep -o 'sema-chan-dump: h=0x[0-9a-f]* eng=0' \ | grep -o '0x[0-9a-f]*' | sort -u | paste -sd, || true } |