Meeting minutes 20060727

[Jose R. Santos]

Frank Ch. Eigler wrote:
> "Jose R. Santos" <jrs@us.ibm.com> writes:
>
> > [...]  One of the things we are currently working on is to have an
> > alternative to gettimeofday.  [...]
>
> Josh Stone's kprobes-safe rendition gettimeofday has been in the
> systemtap runtime for some time now.  Is that not sufficient for
> your purposes?
>   

The goal here is to improve performance.  Gui Jian has timed 
_stp_gettimeofday_us() using LKET and it give a bigger overhead than 
do_gettimeofday().  By doing this in user space we can obtain better 
performance by avoiding disabling preemption or calling seqlock like 
_stp_gettimeofday does.

-JRS