From nobody Mon Feb 9 02:28:47 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1524545616387760.5663820667129; Mon, 23 Apr 2018 21:53:36 -0700 (PDT) Received: from localhost ([::1]:56509 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fApxJ-0002sM-L2 for importer@patchew.org; Tue, 24 Apr 2018 00:53:29 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49386) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fApvW-00021G-8B for qemu-devel@nongnu.org; Tue, 24 Apr 2018 00:51:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fApvV-0006WT-9D for qemu-devel@nongnu.org; Tue, 24 Apr 2018 00:51:38 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:58562 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fApvV-0006WL-4c for qemu-devel@nongnu.org; Tue, 24 Apr 2018 00:51:37 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A77CF8182D2E; Tue, 24 Apr 2018 04:51:36 +0000 (UTC) Received: from xz-mi.nay.redhat.com (dhcp-14-151.nay.redhat.com [10.66.14.151]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2B1661134CD3; Tue, 24 Apr 2018 04:51:33 +0000 (UTC) From: Peter Xu To: qemu-devel@nongnu.org Date: Tue, 24 Apr 2018 12:51:11 +0800 Message-Id: <20180424045112.12963-4-peterx@redhat.com> In-Reply-To: <20180424045112.12963-1-peterx@redhat.com> References: <20180424045112.12963-1-peterx@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Tue, 24 Apr 2018 04:51:36 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Tue, 24 Apr 2018 04:51:36 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'peterx@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH v5 3/4] QemuMutex: support --enable-debug-mutex X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , "Emilio G . Cota" , Fam Zheng , peterx@redhat.com, Stefan Hajnoczi Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" We have had some tracing tools for mutex but it's not easy to use them for e.g. dead locks. Let's provide "--enable-debug-mutex" parameter when configure to allow QemuMutex to store the last owner that took specific lock. It will be easy to use this tool to debug deadlocks since we can directly know who took the lock then as long as we can have a debugger attached to the process. Signed-off-by: Peter Xu Reviewed-by: Emilio G. Cota --- configure | 10 ++++++++++ include/qemu/thread-posix.h | 4 ++++ include/qemu/thread-win32.h | 4 ++++ util/qemu-thread-common.h | 12 ++++++++++++ 4 files changed, 30 insertions(+) diff --git a/configure b/configure index 0a19b033bc..a80af735b2 100755 --- a/configure +++ b/configure @@ -451,6 +451,7 @@ jemalloc=3D"no" replication=3D"yes" vxhs=3D"" libxml2=3D"" +debug_mutex=3D"no" =20 supported_cpu=3D"no" supported_os=3D"no" @@ -1374,6 +1375,10 @@ for opt do ;; --disable-git-update) git_update=3Dno ;; + --enable-debug-mutex) debug_mutex=3Dyes + ;; + --disable-debug-mutex) debug_mutex=3Dno + ;; *) echo "ERROR: unknown option $opt" echo "Try '$0 --help' for more information" @@ -1631,6 +1636,7 @@ disabled with --disable-FEATURE, default is enabled i= f available: crypto-afalg Linux AF_ALG crypto backend driver vhost-user vhost-user support capstone capstone disassembler support + debug-mutex mutex debugging support =20 NOTE: The object files are built at the place where configure is launched EOF @@ -5874,6 +5880,7 @@ echo "avx2 optimization $avx2_opt" echo "replication support $replication" echo "VxHS block device $vxhs" echo "capstone $capstone" +echo "mutex debugging $debug_mutex" =20 if test "$sdl_too_old" =3D "yes"; then echo "-> Your SDL version is too old - please upgrade to have SDL support" @@ -6602,6 +6609,9 @@ fi if test "$capstone" !=3D "no" ; then echo "CONFIG_CAPSTONE=3Dy" >> $config_host_mak fi +if test "$debug_mutex" =3D "yes" ; then + echo "CONFIG_DEBUG_MUTEX=3Dy" >> $config_host_mak +fi =20 # Hold two types of flag: # CONFIG_THREAD_SETNAME_BYTHREAD - we've got a way of setting the name = on diff --git a/include/qemu/thread-posix.h b/include/qemu/thread-posix.h index f3f47e426f..fd27b34128 100644 --- a/include/qemu/thread-posix.h +++ b/include/qemu/thread-posix.h @@ -12,6 +12,10 @@ typedef QemuMutex QemuRecMutex; =20 struct QemuMutex { pthread_mutex_t lock; +#ifdef CONFIG_DEBUG_MUTEX + const char *file; + int line; +#endif bool initialized; }; =20 diff --git a/include/qemu/thread-win32.h b/include/qemu/thread-win32.h index 3a05e3b3aa..d668d789b4 100644 --- a/include/qemu/thread-win32.h +++ b/include/qemu/thread-win32.h @@ -5,6 +5,10 @@ =20 struct QemuMutex { SRWLOCK lock; +#ifdef CONFIG_DEBUG_MUTEX + const char *file; + int line; +#endif bool initialized; }; =20 diff --git a/util/qemu-thread-common.h b/util/qemu-thread-common.h index 3bf37c9963..f7ec7b9fe3 100644 --- a/util/qemu-thread-common.h +++ b/util/qemu-thread-common.h @@ -19,6 +19,10 @@ =20 static inline void qemu_mutex_post_init(QemuMutex *mutex) { +#ifdef CONFIG_DEBUG_MUTEX + mutex->file =3D NULL; + mutex->line =3D 0; +#endif mutex->initialized =3D true; } =20 @@ -31,12 +35,20 @@ static inline void qemu_mutex_pre_lock(QemuMutex *mutex, static inline void qemu_mutex_post_lock(QemuMutex *mutex, const char *file, int line) { +#ifdef CONFIG_DEBUG_MUTEX + mutex->file =3D file; + mutex->line =3D line; +#endif trace_qemu_mutex_locked(mutex, file, line); } =20 static inline void qemu_mutex_pre_unlock(QemuMutex *mutex, const char *file, int line) { +#ifdef CONFIG_DEBUG_MUTEX + mutex->file =3D NULL; + mutex->line =3D 0; +#endif trace_qemu_mutex_unlock(mutex, file, line); } =20 --=20 2.14.3