Modify the output of perf script

Modify the output of perf script

[Arnab]

Hello,

I have been using IntelPT and perf-kvm to collect guest VM generated PT 
packets from the host. I use the below command to record the IntelPT 
traces :-

./perf kvm --guest -guestkallsyms=~/guest-kallsyms 
-guestmodules=~/guest-modules -e intel_pt//

I am using the latest stable Linux kernel version that is 4.14.3 and I 
am using an Ubuntu 17.04 machine running on architecture x86_64.

The above command works fine and is giving me the correct outputs as I 
expect. Now I am trying to see the raw trace dump using perf script -D

./perf script -D -i perf.data.guest

I see all the event records and all their outputs correctly. But what I 
wanted was to make perf script only display me the events corresponding 
to IntelPT trace packets.

This means that I am especially not interested in events like 
PERF_RECORD_COMM and PERF_RECORD_FORK etc and even 
PERF_RECORD_MMAP/PERF_RECORD_MMAP2. I only want perf script to display 
me the raw trace packets under PERF_RECORD_AUXTRACE.

There are obviously two cases here which I have so far considered but 
have not been able to get anywhere :

1. I have tried making perf record stop recording events, which I do not 
want like PERF_RECORD_MMAP, PERF_RECORD_FORK etc. I have been 
unsuccessful and I also think this is not the right approach.

2. The other approach that I have tried is making perf script -D to not 
print the MMAP and FORK events instead but keep recording them. I have 
not been able to do this as I have not been able to trace back in the 
linux-kernel code where the actual print is happening. This looks 
correct and probably easier to achieve.

How can I achieve one of the two goals stated above ? How can I make 
perf script dump me exactly what I want ?

Thanks and Regards,
Arnab