linux-kernel - Re: sched_clock

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Message-Id: <1271343970.3856.7.camel@iscandar.digidescorp.com>
Date:	Thu, 15 Apr 2010 10:06:10 -0500
From:	"Steven J. Magnani" <steve@...idescorp.com>
To:	michal.simek@...alogix.com
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Wu Zhangjin <wuzhangjin@...il.com>
Subject: Re: sched_clock - microblaze

Michal,

On Thu, 2010-04-15 at 16:55 +0200, Michal Simek wrote:

> Is unimplemented sched_clock the reason why ftrace not show fine grain time?
> 
> Or is there any other thing which is wrong?
> 

I think that's it. On my platform we have a free-running 1 MHz counter
so I implemented a platform sched_clock for that, and I get nice ftrace
times.

 0) + 65.000 us   |  finish_task_switch();
 0)               |  lock_sock_nested() {
 0) + 52.000 us   |    local_bh_disable();
 0) + 53.000 us   |    local_bh_enable();
 0) ! 264.000 us  |  }

Steve



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