linux-kernel - Re: Unified tracing buffer

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Date:	Tue, 23 Sep 2008 14:59:59 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Martin Bligh <mbligh@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>, darren@...art.com,
	"Frank Ch. Eigler" <fche@...hat.com>,
	systemtap-ml <systemtap@...rces.redhat.com>
Subject: Re: Unified tracing buffer

Hi Thomas,

Thomas Gleixner wrote:
> 
> Do you have C-States enabled on that machine ?
> 
> ls /sys/devices/system/cpu/cpu0/cpuidle/
> 
> has it more than a state0 entry ?

Yes, there are state0 to state3
# ls /sys/devices/system/cpu/cpu0/cpuidle/
state0  state1  state2  state3

> If yes, please do:
> 
> cat /sys/devices/system/cpu/cpu0/cpuidle/stateX/usage
> 
> where X is the highest number in there.

# cat /sys/devices/system/cpu/cpu0/cpuidle/state3/usage
171210

> 
> cat /proc/acpi/processor/CPU0/power
> 
> might be useful as well.

# cat /proc/acpi/processor/CPU0/power
active state:            C0
max_cstate:              C8
bus master activity:     00000000
maximum allowed latency: 2000000000 usec
states:
    C1:                  type[C1] promotion[--] demotion[--] latency[001] usage[00000016] duration[00000000000000000000]
    C2:                  type[C2] promotion[--] demotion[--] latency[001] usage[00037969] duration[00000000000024288003]
    C3:                  type[C3] promotion[--] demotion[--] latency[057] usage[00171818] duration[00000000001881257636]

Could these help you?

Thank you,

> 
> Thanks,
> 
> 	tglx

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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