<div dir="ltr">Dear Anish, Mulyadi,<div><br></div><div style>this is how i read jiffies.</div><div style><br></div><div style>unsigned long start_time, end_time;</div><div style>start_time = jiffies;</div><div style>free_area(***);</div>
<div style>end_time = jiffies;</div><div style>printk("%ld", end_time-start_time);</div><div style><br></div><div style>I onserved jiffies getting incremented at different place, though</div><div style><br></div>
<div style>thanks</div><div style>sandeep</div><div style><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jan 22, 2013 at 10:29 AM, sandeep kumar <span dir="ltr"><<a href="mailto:coolsandyforyou@gmail.com" target="_blank">coolsandyforyou@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi All<div>I am seeing this problem at the very early in the start_kernel--> mm_init--> free_highpages, at that time nothing is up and kernel is running in single thread.</div>
<div><br></div>
<div>Thanks</div><span class="HOEnZb"><font color="#888888"><div>Sandeep</div></font></span></div><div class="gmail_extra"><div><div class="h5"><br><br><div class="gmail_quote">On Tue, Jan 22, 2013 at 1:07 AM, hejianet <span dir="ltr"><<a href="mailto:hejianet@linux.vnet.ibm.com" target="_blank">hejianet@linux.vnet.ibm.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">how about to check the disable/enable timer interrupt?<br>
cat /proc/stat before/after 2 seconds?<br>
<div><div>On 2013-01-22 13:51, sandeep kumar wrote:<br>
> Hi all<br>
> As far as I know jiffie counter is incremented HZ times/second. And it is<br>
> used to measure the time lapses in the kernel code.<br>
><br>
> I m seeing a case where, actualy time spent in some module using giffies is<br>
> zero, but while seeing UART logs i am seein 2 sec time difference. I dont<br>
> know how to interpret this. The case which i am seeing, hrtimers are not<br>
> enabled yet, so only thing i can rely are on jiffies.<br>
><br>
> My question here is,<br>
> Is it possible that the measured time lapse shown is "0"(jiffie count is<br>
> same before and after), but actually some time is spent?(say some 2 sec)<br>
><br>
> In another way..can jiffies may freeze for some time?<br>
><br>
> Please clarify...<br>
><br>
><br>
><br>
><br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div></div></div><div class="im">-- <br>With regards,<br>Sandeep Kumar Anantapalli,<br>
</div></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br>With regards,<br>Sandeep Kumar Anantapalli,<br>
</div>