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[Bug tapsets/11209] Provide an alternative time tapset
- From: "jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 26 Jan 2010 22:55:35 -0000
- Subject: [Bug tapsets/11209] Provide an alternative time tapset
- References: <20100121223614.11209.jistone@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From jistone at redhat dot com 2010-01-26 22:55 -------
(In reply to comment #1)
> Is cpu_clock() synchronized across cpus?
At the top of sched_clock.c, it says:
* The clock: sched_clock_cpu() is monotonic per cpu, and should be somewhat
* consistent between cpus (never more than 2 jiffies difference).
We should probably experiment to estimate the practical difference of being
"somewhat consistent".
(And FWIW, I'm not even sure how close we can assert our current gtod is.)
--
http://sourceware.org/bugzilla/show_bug.cgi?id=11209
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