diff options
Diffstat (limited to 'tools/guest-diag/pin_gr_stream.py')
| -rw-r--r-- | tools/guest-diag/pin_gr_stream.py | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/tools/guest-diag/pin_gr_stream.py b/tools/guest-diag/pin_gr_stream.py index 6eb5be7..ff7e299 100644 --- a/tools/guest-diag/pin_gr_stream.py +++ b/tools/guest-diag/pin_gr_stream.py @@ -100,15 +100,33 @@ def _scanner_alive(): return "ALIVE" in (out or "") +def _demand_write_cmd(vas): + """Build a transport-proof append command for the guest demand file. + + r582: the old `printf '%s' '<lines with real LF>'` form was mangled by + the guest-agent transport under load - the newlines arrived as LITERAL + backslash-n text and merged VAs onto one line, and the guest scanner's + parser then crashed on `int('0x20400f000\\\\n0x121000000...', 16)` + (ValueError in main; r581 boot scanner log). The scanner's death stopped + ALL new pins while the host only re-asserted known pairs - the observed + pool-pin-latency (0x121000000 never arrived while other injections + flowed). One `echo <va> >> file` per VA carries no newlines and no + backslashes at all, so no transport layer can escape them.""" + return "; ".join("echo 0x%x >> /tmp/guest_want_vas.txt" % va + for va in vas) + + def _demand_send(vas): """Append VA hints to the guest scanner's demand file (best-effort). Same channel pin_gr_stream._demand_loop uses for host-dmesg stalls; the stall watchdog uses it to ask the scanner to re-resolve the fixed pre-capture VAs (counter page / UVM pool) by content/pagemap.""" - lines = "".join("0x%x\n" % va for va in vas) + cmd = _demand_write_cmd(vas) + if not cmd: + return try: - vexec("printf '%%s' '%s' >> /tmp/guest_want_vas.txt" % lines, 30) + vexec(cmd, 30) except Exception: pass @@ -222,9 +240,9 @@ def _demand_loop(): todo = [va for va, (f, l) in track.items() if now - l > 20.0] if not todo: continue - lines = "".join("0x%x\n" % va for va in todo) + cmd = _demand_write_cmd(todo) try: - vexec("printf '%%s' '%s' >> /tmp/guest_want_vas.txt" % lines, 30) + vexec(cmd, 30) except Exception: continue for va in todo: |