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RE: gettimeofday with interrupts disabled
- From: "Stone, Joshua I" <joshua dot i dot stone at intel dot com>
- To: <azizeker at gmail dot com>
- Cc: <systemtap at sources dot redhat dot com>
- Date: Mon, 8 May 2006 10:28:11 -0700
- Subject: RE: gettimeofday with interrupts disabled
On Sunday, May 07, 2006 6:24 PM, Aziz Eker wrote:
> I want to get some measurements about the time scheduler_tick()
> function takes. To do that, I am finding time difference between the
> start and end of the function using 'gettimeofday_us'. However, the
> scheduler_tick() function is called with interrupts disabled. Does
> 'gettimeofday' continue to run even when interrupts are disabled? If
> not, is there anyway to count the RTC in systemtap?
Calling gettimeofday is only a problem for probes in code sections that
hold a write lock on xtime_lock. See bug #2525 for more details:
http://sources.redhat.com/bugzilla/show_bug.cgi?id=2525
Josh