[lttng-dev] clock_gettime vdso issue

[Mathieu Desnoyers]

Yes, the clock override feature, as well as the getcpu override,
should be merged within lttng-ust and lttng-tools master branches
this week. Stay tuned!

Thanks,

Mathieu

----- Original Message -----
> There has been discussions regarding adding capability to override the clock
> implementation.
> 
> If that support is arriving, you could always write your own (say a separate
> thread reading clock periodically and storing in a cache, then your own
> clock implementation could get that cached timestamp).
> Obviously you would need to think very carefully about clock resolution and
> frequency for your clock thread, but it should from a performance point of
> view be big improvement..
> 
> Maybe Mathieu(?) could shed some light on the clock override?
> 
> /Jesper
> 
> ________________________________
> > Date: Thu, 26 Mar 2015 15:25:49 +0800
> > From: zhenyu.ren at aliyun.com
> > To: lttng-dev at lists.lttng.org
> > Subject: [lttng-dev] clock_gettime vdso issue
> > 
> > 
> > Hi,Team
> > 
> > You may not feel how painful I am with a too old GLIBC which does
> > NOT support vdso clock_gettime. Especially in ust case,
> > trace_clock_read will call clock_gettime to record the time of every
> > event.
> > Does anyone know how to avoid system_call clock_gettime with this old
> > GLIBC??
> > 
> > Thanks in advance
> > zhenyu.ren
> > 
> > 
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> > lttng-dev at lists.lttng.org
> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com