Messages in this thread | | | Date | Sun, 20 Feb 2011 13:49:34 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH 2/3] perf events: Introduce realtime clock event |
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* Peter Zijlstra <peterz@infradead.org> wrote:
> > Programs that generate time-of-day output are using gettimeofday which is tied > > to CLOCK_REALTIME. We want to be able to correlate a perf sample to an entry in > > an applications log file. > > Well, you can argue those programs are broken :-), [...]
Then 99% of the world is broken as daylight saving time jumps are part of our lives.
> [...] Imagine the joys of trying to figure out wth happens when DST jumps the > clock back an hour and you have an hour of duplicate data.
DST means twice a year the clock jumps back and forth by exactly one hour, on a given Saturday night. People debugging logs on Saturday nights and not realizing that there's a (always highly publicized) DST switch going on *deserve* to be surprised twice a year! :-)
Really, i dont think it's a big issue - and timestamping in *real* time has very obvious advantages as its name already suggests.
Thanks,
Ingo
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