linux-kernel - sched_clock

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Date:	Thu, 15 Apr 2010 16:55:25 +0200
From:	Michal Simek <michal.simek@...alogix.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
CC:	Wu Zhangjin <wuzhangjin@...il.com>
Subject: sched_clock - microblaze

Hi Thomas and Steven,

I would like to improve time measuring for ftrace (Log below)

I looked at http://lkml.org/lkml/2009/11/16/181
where Thomas suggested to create sched_clock() function.
I used the same solution as Wu proposed but it is not nice.

Is unimplemented sched_clock the reason why ftrace not show fine grain time?

Or is there any other thing which is wrong?

Thanks,
Michal



Dumping ftrace buffer:
---------------------------------
  0) ! 10000.00 us |                                }
  0)   <========== |
  0) ! 10000.00 us |                            }
  0) ! 10000.00 us |                          }
  0)   0.000 us    |                          get_seconds();
  0)   0.000 us    |                          tcp_rcv_rtt_update();
  0)   0.000 us    |                          tcp_ack();
  0)   0.000 us    |                          tcp_rcv_rtt_update();
  0)   0.000 us    |                          tcp_urg();
  0)               |                          tcp_data_queue() {
  0)   0.000 us    |                            __sk_mem_schedule();
  0)   0.000 us    |                            tcp_event_data_recv();
  0)   0.000 us    |                            sock_def_readable();
  0)   0.000 us    |                          }
  0)   0.000 us    |                          tcp_check_space();
  0)               |                          __tcp_ack_snd_check() {


-- 
Michal Simek, Ing. (M.Eng)
PetaLogix - Linux Solutions for a Reconfigurable World
w: www.petalogix.com p: +61-7-30090663,+42-0-721842854 f: +61-7-30090663
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