Re: [PATCH 3/3] perf events: add timehist option to record and report
flat view
From: Ingo Molnar <hidden>
Date: 2011-02-18 07:07:23
Also in:
lkml
* David Ahern [off-list ref] wrote:
quoted hunk ↗ jump to hunk
+--timehist:: + Generate time history output. This shows each sample with a wall-clock + timestamp and address to symbol conversions. The samples are output in + the same order they exist in the perf.data file. The --timehist option + must be used with the record to get wall-clock timestamps.
Displaying samples this way is very useful, but how is this different from trace
output - i.e. 'perf script' output?
There's a 'live logging mode' feature:
perf record ./myworkload | perf inject -v -b | perf script -i -
( There's also some work going on to have a separate 'perf trace' utility that will
output a linear trace of whatever events in perf.data are. )
So unless i'm missing something it would be more useful to extend 'perf script' (or
the upcoming 'perf trace') to list regular samples in a perf.data (i.e. not rely on
-R raw trace data alone), and of course allow a straightforward utilization of real
timestamps, when available.
Thanks,
Ingo