qemu-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [PATCH v2 3/6] scripts/qemu-gdb/tcg: new helper to dump


From: Philippe Mathieu-Daudé
Subject: Re: [Qemu-devel] [PATCH v2 3/6] scripts/qemu-gdb/tcg: new helper to dump tcg state
Date: Tue, 30 May 2017 22:41:49 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 05/17/2017 11:52 AM, Alex Bennée wrote:
This adds a simple helper to dump lock state within TCG.

Signed-off-by: Alex Bennée <address@hidden>

Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

---
 scripts/qemu-gdb.py    |  3 ++-
 scripts/qemugdb/tcg.py | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 scripts/qemugdb/tcg.py

diff --git a/scripts/qemu-gdb.py b/scripts/qemu-gdb.py
index 3e7adb87dc..91e928f6af 100644
--- a/scripts/qemu-gdb.py
+++ b/scripts/qemu-gdb.py
@@ -26,7 +26,7 @@ import os, sys

 sys.path.append(os.path.dirname(__file__))

-from qemugdb import aio, mtree, coroutine, timers
+from qemugdb import aio, mtree, coroutine, timers, tcg

 class QemuCommand(gdb.Command):
     '''Prefix for QEMU debug support commands'''
@@ -39,6 +39,7 @@ coroutine.CoroutineCommand()
 mtree.MtreeCommand()
 aio.HandlersCommand()
 timers.TimersCommand()
+tcg.TCGLockStatusCommand()

 coroutine.CoroutineSPFunction()
 coroutine.CoroutinePCFunction()
diff --git a/scripts/qemugdb/tcg.py b/scripts/qemugdb/tcg.py
new file mode 100644
index 0000000000..8c7f1d7454
--- /dev/null
+++ b/scripts/qemugdb/tcg.py
@@ -0,0 +1,46 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+#
+# GDB debugging support, TCG status
+#
+# Copyright 2016 Linaro Ltd
+#
+# Authors:
+#  Alex Bennée <address@hidden>
+#
+# This work is licensed under the terms of the GNU GPL, version 2.  See
+# the COPYING file in the top-level directory.
+#
+# Contributions after 2012-01-13 are licensed under the terms of the
+# GNU GPL, version 2 or (at your option) any later version.
+
+# 'qemu tcg-lock-status' -- display the TCG lock status across threads
+
+import gdb
+
+class TCGLockStatusCommand(gdb.Command):
+    '''Display TCG Execution Status'''
+    def __init__(self):
+        gdb.Command.__init__(self, 'qemu tcg-lock-status', gdb.COMMAND_DATA,
+                             gdb.COMPLETE_NONE)
+
+    def invoke(self, arg, from_tty):
+        gdb.write("Thread, BQL (iothread_mutex), Replay, Blocked?\n")
+        for thread in gdb.inferiors()[0].threads():
+            thread.switch()
+
+            iothread = gdb.parse_and_eval("iothread_locked")
+            replay = gdb.parse_and_eval("replay_locked")
+
+            frame = gdb.selected_frame()
+            if frame.name() == "__lll_lock_wait":
+                frame.older().select()
+                mutex = gdb.parse_and_eval("mutex")
+                owner = gdb.parse_and_eval("mutex->__data.__owner")
+                blocked = ("__lll_lock_wait waiting on %s from %d" %
+                           (mutex, owner))
+            else:
+                blocked = "not blocked"
+
+            gdb.write("%d/%d, %s, %s, %s\n" % (thread.num, thread.ptid[1],
+                                               iothread, replay, blocked))




reply via email to

[Prev in Thread] Current Thread [Next in Thread]