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From: Parav Pandit <paravpandit@yahoo.com>
To: Linux kernel <linux-kernel@vger.kernel.org>
Subject: Calculating time in order of 0.1usec on x86 system
Date: Tue, 30 Sep 2008 00:01:55 -0700 (PDT)	[thread overview]
Message-ID: <855204.33912.qm@web30108.mail.mud.yahoo.com> (raw)

Hi,

I need to calculate time spent by a function in order of less then a microsecond on x86 SMP platform.

Current profiling tools and gettimeofday() are not sufficient.

So I am using get_cycles() to get the CPU cycles.

Now how do I convert it into the time interval?

Do I have to divide it by "cpu_khz" variable? Or some other method?
Is yes, what will be the unit of the result (time interval)? nsec/usec/msec?

e.g. get_cycles()/cpu_khz (unit?)

Or Is there more simpler method exist?

Regards,
Parav Pandit


      

             reply	other threads:[~2008-09-30  7:08 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-30  7:01 Parav Pandit [this message]
2008-09-30  9:37 ` Calculating time in order of 0.1usec on x86 system Parav Pandit

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