Re: Filter option should follow a tracer option

[Jack Henschel <jackdev@mailbox.org>]

> Adrian Hunter <adrian.hunter@intel.com> hat am 23. August 2017 um 08:06 geschrieben:
> 
> 
> On 22/08/17 22:00, Arnaldo Carvalho de Melo wrote:
> > Em Fri, Aug 18, 2017 at 11:43:51AM +0200, Jack Henschel escreveu:
> >> Hi everyone,
> >>
> >> I'm experimenting with Intel PT and perf, but I am currently stuck at getting filters to work with `perf record`.
> >>
> >> I have the following command:
> >>> perf record -e intel_pt// --filter 'filter main @ /bin/sleep' /bin/sleep 1
> >> But it throws this error message:
> >>> --filter option should follow a -e tracepoint or HW tracer option
> >>
> >> Maybe this is a trivial mistake, but I don't understand the error, because as far as I'm concerned the --filter options *is* following a -e HW tracer option.
> >>
> >> I'm using perf version 4.9.30 with kernel 4.9.30-2+deb9u3 on Debian 9 Stretch.
> 
> It looks like either your CPU does not support Intel PT at all, or it does not support address filtering.

My CPU (Xeon CPU E5-2680 v4) supports Intel PT (intel_pt flag is present in /proc/cpuinfo), but this is not an issue with Intel PT. Here are some more examples (with various syntaxes):

> $ perf list | grep -E 'intel_pt|branch-loads|cache-misses'
>  cache-misses                                       [Hardware event]
>  branch-loads                                       [Hardware cache event]
>  cache-misses OR cpu/cache-misses/                  [Kernel PMU event]
>  intel_pt//                                         [Kernel PMU event]
> $ perf record --event intel_pt// --exclude-perf -a
> --exclude-perf option should follow a -e tracepoint option
> $ perf record --event=branch-loads --filter 'filter main @ /bin/sleep' -- /bin/sleep 1
> --filter option should follow a -e tracepoint or HW tracer option
> $ perf record -e cache-misses --filter 'filter main @ /bin/sleep' -- /bin/sleep 1
> --filter option should follow a -e tracepoint or HW tracer option

> Have you checked the value of /sys/bus/event_source/devices/intel_pt/nr_addr_filters ?
I don't have that file:
> $ ls -l /sys/bus/event_source/devices/intel_pt/   
> total 0
> drwxr-xr-x 2 root root    0 Aug 22 06:32 caps
> drwxr-xr-x 2 root root    0 Aug 22 06:32 format
> -r--r--r-- 1 root root 4096 Aug 23 04:47 max_nonturbo_ratio
> -rw-r--r-- 1 root root 4096 Aug 23 04:47 perf_event_mux_interval_ms
> drwxr-xr-x 2 root root    0 Aug 23 04:47 power
> lrwxrwxrwx 1 root root    0 Aug 22 06:30 subsystem -> ../../bus/event_source
> -r--r--r-- 1 root root 4096 Aug 23 04:47 tsc_art_ratio
> -r--r--r-- 1 root root 4096 Aug 22 06:32 type
> -rw-r--r-- 1 root root 4096 Aug 22 06:30 uevent


The above commands were ran on linux kernel 4.13-rc6 along with perf 4.13 (both compiled from git):
> $ uname -r
> 4.13.0-rc6+
> $ perf version
> perf version 4.13.rc6.g647081

Greetings
Jack