Re: [PATCH v2] perf stat: enable 1ms interval for printing event counters values

[Arnaldo Carvalho de Melo]

Em Wed, Apr 04, 2018 at 09:05:16AM +0200, Jiri Olsa escreveu:
> On Tue, Apr 03, 2018 at 09:18:33PM +0300, Alexey Budankov wrote:
> > 
> > Currently print count interval for performance counters values is 
> > limited by 10ms so reading the values at frequencies higher than 100Hz 
> > is restricted by the tool.
> > 
> > This change makes perf stat -I possible on frequencies up to 1KHz and, 
> > to some extent, makes perf stat -I to be on-par with perf record 
> > sampling profiling.
> > 
> > When running perf stat -I for monitoring e.g. PCIe uncore counters and 
> > at the same time profiling some I/O workload by perf record e.g. for 
> > cpu-cycles and context switches, it is then possible to observe 
> > consolidated CPU/OS/IO(Uncore) performance picture for that workload.
> > 
> > Tool overhead warning printed when specifying -v option can be missed 
> > due to screen scrolling in case you have output to the console 
> > so message is moved into help available by running perf stat -h.
> > 
> > Signed-off-by: Alexey Budankov <alexey.budankov@xxxxxxxxxxxxxxx>
> > ---
> > 
> > Changes in v2:
> >  - updated minimum value to 1ms at perf-stat.txt manual
> 
> Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>

Thanks, applied to perf/core.

- Arnaldo