From: hejianet@linux.vnet.ibm.com (hejianet)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Can jiffies freeze?
Date: Tue, 22 Jan 2013 17:07:37 +0800 [thread overview]
Message-ID: <50FE56D9.5000103@linux.vnet.ibm.com> (raw)
In-Reply-To: <CAL7WMDcf-c96x9eM2283L5qSWuJtJ3RgPN9QpCNcVTyVaAhnNA@mail.gmail.com>
how about to check the disable/enable timer interrupt?
cat /proc/stat before/after 2 seconds?
On 2013-01-22 13:51, sandeep kumar wrote:
> Hi all
> As far as I know jiffie counter is incremented HZ times/second. And it is
> used to measure the time lapses in the kernel code.
>
> I m seeing a case where, actualy time spent in some module using giffies is
> zero, but while seeing UART logs i am seein 2 sec time difference. I dont
> know how to interpret this. The case which i am seeing, hrtimers are not
> enabled yet, so only thing i can rely are on jiffies.
>
> My question here is,
> Is it possible that the measured time lapse shown is "0"(jiffie count is
> same before and after), but actually some time is spent?(say some 2 sec)
>
> In another way..can jiffies may freeze for some time?
>
> Please clarify...
>
>
>
>
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> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
next prev parent reply other threads:[~2013-01-22 9:07 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-22 5:51 Can jiffies freeze? sandeep kumar
2013-01-22 7:33 ` anish singh
2013-01-22 7:33 ` anish singh
2013-01-22 8:27 ` Mulyadi Santosa
2013-01-22 9:07 ` hejianet [this message]
2013-01-22 18:29 ` sandeep kumar
2013-01-22 18:36 ` sandeep kumar
2013-01-23 15:42 ` Mulyadi Santosa
[not found] ` <CAL7WMDexejzaoiDHue-eFK6u59U6mUuz2euo9QoViVY_7Hk8Bg@mail.gmail.com>
2013-01-28 7:59 ` Mulyadi Santosa
2013-01-22 18:40 ` Valdis.Kletnieks at vt.edu
2013-01-22 19:32 ` sandeep kumar
2013-01-22 20:38 ` Valdis.Kletnieks at vt.edu
2013-01-22 23:04 ` sandeep kumar
2013-01-23 6:05 ` bill4carson
2013-01-23 15:08 ` Valdis.Kletnieks at vt.edu
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