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Date: Wed, 20 Aug 2008 09:12:54 -0400 (EDT) From: Steven Rostedt <rostedt@...dmis.org> To: Eran Liberty <liberty@...ricom.com> cc: Steven Rostedt <srostedt@...hat.com>, linux-kernel@...r.kernel.org, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, linuxppc-dev@...abs.org Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3) On Wed, 20 Aug 2008, Eran Liberty wrote: > Steven Rostedt wrote: > > On Tue, 19 Aug 2008, Eran Liberty wrote: > > > > > > > Steven Rostedt wrote: > > > > > > > > > > > > Testing tracer sched_switch: PASSED > > > > > Testing tracer ftrace: PASSED > > > > > Testing dynamic ftrace: PASSED > > > > > > > > > Do you have PREEMPT_TRACER enabled, or any other tracer for that matter? > > > > -- Steve > > > I can see stack trace & context trace, but they are derived from other choices > (I can not un select them) Yeah, those are not bad. > > cat .config | grep TRACE > CONFIG_STACKTRACE_SUPPORT=y > CONFIG_HAVE_ARCH_TRACEHOOK=y > # CONFIG_BLK_DEV_IO_TRACE is not set > CONFIG_STACKTRACE=y > # CONFIG_BACKTRACE_SELF_TEST is not set > CONFIG_HAVE_FTRACE=y > CONFIG_HAVE_DYNAMIC_FTRACE=y > CONFIG_FTRACE=y > # CONFIG_SCHED_TRACER is not set > CONFIG_CONTEXT_SWITCH_TRACER=y > CONFIG_DYNAMIC_FTRACE=y > CONFIG_FTRACE_SELFTEST=y > CONFIG_FTRACE_STARTUP_TEST=y You must not have PREEMPT on, so the PREEMPT_TRACER will not show up. The reason I asked, is that my PowerBook runs fine without PREEMPT_TRACER but is very unstable when I have PREEMPT_TRACER enabled. -- Steve > > > > > > > Oops: Exception in kernel mode, sig: 11 [#1] > > > > > Exsw1600 > > > > > Modules linked in: > > > > > NIP: c00bbb20 LR: c00bbb20 CTR: 00000000 > > > > > > > > > > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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