From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50706) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dB0J8-0001jL-Ma for qemu-devel@nongnu.org; Wed, 17 May 2017 10:52:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dB0J7-0004fA-Hv for qemu-devel@nongnu.org; Wed, 17 May 2017 10:52:10 -0400 Received: from mail-wm0-x22f.google.com ([2a00:1450:400c:c09::22f]:36111) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dB0J7-0004f2-Bb for qemu-devel@nongnu.org; Wed, 17 May 2017 10:52:09 -0400 Received: by mail-wm0-x22f.google.com with SMTP id 70so13261416wmq.1 for ; Wed, 17 May 2017 07:52:09 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= Date: Wed, 17 May 2017 15:52:56 +0100 Message-Id: <20170517145259.28979-4-alex.bennee@linaro.org> In-Reply-To: <20170517145259.28979-1-alex.bennee@linaro.org> References: <20170517145259.28979-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PATCH v2 3/6] scripts/qemu-gdb/tcg: new helper to dump tcg state List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: pbonzini@redhat.com, stefanha@redhat.com Cc: cota@braap.org, qemu-devel@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= This adds a simple helper to dump lock state within TCG. Signed-off-by: Alex Bennée --- 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 +# +# 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)) -- 2.11.0