linux-kernel - Re: Tracing configuration review

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Message-Id: <20100611145116.72c88387.randy.dunlap@oracle.com>
Date:	Fri, 11 Jun 2010 14:51:16 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Chase Douglas <chase.douglas@...onical.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Soeren Sandmann <sandmann@...mi.au.dk>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Subject: Re: Tracing configuration review

On Tue, 08 Jun 2010 18:00:34 -0400 Chase Douglas wrote:

> On Tue, 2010-06-08 at 10:35 -0700, Randy Dunlap wrote:
> > Hi Chase,
> > 
> > Would you mind sharing your final tracing config options?
> 
> Sure.
> 
> Our source tree for Maverick encompasses all our major supported
> platforms in one git branch. Thus, we have one common config file and a
> bunch of arch and flavour (generic, server, virtual, pae) specific
> config files. One note about the common configs: if a config option
> would not exist because an option in a specific config file is set a
> certain way, then you can ignore it for that specific arch/flavour. For
> example, the common config has CONFIG_DYNAMIC_FTRACE=y, but the armel
> config has "CONFIG_FUNCTION_TRACER is not set" so the former would not
> have any affect on armel builds.
> 
> You can find the source branch at
> http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-maverick.git;a=summary
> 
> $ grep -Ir "TRAC[EI]" debian.master/config
> ./amd64/config.common.amd64:CONFIG_FUNCTION_TRACER=y
> ./amd64/config.common.amd64:CONFIG_STACK_TRACER=y
> ./i386/config.common.i386:CONFIG_FUNCTION_TRACER=y
> ./i386/config.common.i386:CONFIG_STACK_TRACER=y
> ./armel/config.common.armel:# CONFIG_FUNCTION_TRACER is not set
> ./armel/config.common.armel:# CONFIG_STACK_TRACER is not set
> ./config.common.ubuntu:# CONFIG_BACKTRACE_SELF_TEST is not set
> ./config.common.ubuntu:CONFIG_BLK_DEV_IO_TRACE=y
> ./config.common.ubuntu:# CONFIG_BOOT_TRACER is not set
> ./config.common.ubuntu:CONFIG_CAN_PM_TRACE=y
> ./config.common.ubuntu:CONFIG_CAPI_TRACE=y
> ./config.common.ubuntu:CONFIG_CONTEXT_SWITCH_TRACER=y
> ./config.common.ubuntu:CONFIG_DYNAMIC_FTRACE=y
> ./config.common.ubuntu:CONFIG_EVENT_TRACING=y
> ./config.common.ubuntu:CONFIG_FTRACE=y
> ./config.common.ubuntu:CONFIG_FTRACE_MCOUNT_RECORD=y
> ./config.common.ubuntu:CONFIG_FTRACE_NMI_ENTER=y
> ./config.common.ubuntu:# CONFIG_FTRACE_STARTUP_TEST is not set
> ./config.common.ubuntu:CONFIG_FTRACE_SYSCALLS=y
> ./config.common.ubuntu:CONFIG_FUNCTION_GRAPH_TRACER=y
> ./config.common.ubuntu:CONFIG_GENERIC_TRACER=y
> ./config.common.ubuntu:CONFIG_HAVE_ARCH_TRACEHOOK=y
> ./config.common.ubuntu:CONFIG_HAVE_DYNAMIC_FTRACE=y
> ./config.common.ubuntu:CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
> ./config.common.ubuntu:CONFIG_HAVE_FTRACE_NMI_ENTER=y
> ./config.common.ubuntu:CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
> ./config.common.ubuntu:CONFIG_HAVE_FUNCTION_TRACER=y
> ./config.common.ubuntu:CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST=y
> ./config.common.ubuntu:CONFIG_HAVE_MMIOTRACE_SUPPORT=y
> ./config.common.ubuntu:CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
> ./config.common.ubuntu:# CONFIG_IRQSOFF_TRACER is not set
> ./config.common.ubuntu:CONFIG_IWLWIFI_DEVICE_TRACING=y
> ./config.common.ubuntu:# CONFIG_KMEMTRACE is not set
> ./config.common.ubuntu:# CONFIG_KSYM_TRACER is not set
> ./config.common.ubuntu:CONFIG_MMIOTRACE=y
> ./config.common.ubuntu:# CONFIG_MMIOTRACE_TEST is not set
> ./config.common.ubuntu:CONFIG_NETFILTER_XT_TARGET_TRACE=m
> ./config.common.ubuntu:CONFIG_NOP_TRACER=y
> ./config.common.ubuntu:CONFIG_PM_TRACE=y
> ./config.common.ubuntu:CONFIG_PM_TRACE_RTC=y
> ./config.common.ubuntu:# CONFIG_RCU_TRACE is not set
> ./config.common.ubuntu:CONFIG_SCHED_TRACER=y
> ./config.common.ubuntu:# CONFIG_SCSI_IPR_TRACE is not set
> ./config.common.ubuntu:CONFIG_STACKTRACE=y
> ./config.common.ubuntu:CONFIG_STACKTRACE_SUPPORT=y
> ./config.common.ubuntu:# CONFIG_SYSPROF_TRACER is not set
> ./config.common.ubuntu:CONFIG_TRACEPOINTS=y
> ./config.common.ubuntu:CONFIG_TRACER_MAX_TRACE=y
> ./config.common.ubuntu:CONFIG_TRACE_IRQFLAGS_SUPPORT=y
> ./config.common.ubuntu:CONFIG_TRACING=y
> ./config.common.ubuntu:CONFIG_TRACING_SUPPORT=y
> ./config.common.ubuntu:# CONFIG_TREE_RCU_TRACE is not set
> ./config.common.ubuntu:CONFIG_USER_STACKTRACE_SUPPORT=y
> ./config.common.ubuntu:# CONFIG_VXGE_DEBUG_TRACE_ALL is not set
> ./config.common.ubuntu:# CONFIG_WORKQUEUE_TRACER is not set
> 
> Some of the above is not FTRACE. I also snipped the matches in
> config.common.ports because they are slightly different due to what the
> ports architectures support, but they should be pretty similar.
> 
> Please let me know if anything stands out at you as incorrect.

I'm a bit surprised by one (family) of kconfig symbols here:

PM_TRACE=y, PM_TRACE_RTC=y

That enables low-level kernel developer debugging code.

Other than that, the rest make sense to me.


thanks.  [I don't know about that "armel" stuff.]

---
~Randy
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