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I'm trying to use the linux performance tool perf to monitor kvm events on a host where a guest VM exists.

The command I invoke perf is 

perf kvm stat record

After some time, I'll press Ctrl + C to stop it and it will show some info like how many times it has been waken up to write data, and it will spend some time before truly exiting, which I suppose it's writing data.

Basically what I want to achieve is automatically stop the perf process after 1 minute. Here is a prototype of my script:

perf kvm stat record &
pid=$!
sleep 60
sudo kill -2 $pid

The problem here is when I terminate the process in this way, it won't properly write data to disk.And I've tried to send signal 2 and 9, neither works for me.

Does anyone know how to properly interrupt perf process so that it will finish writing data then exit?

Michael Tong
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1 Answers1

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According to the perf kvm description here, you have to use SIGINT(7) to kill the perf process. This ensures that perf properly dumps the collected data to file.

perf kvm stat record &
pid=$!
sleep 60
sudo kill -INT $pid
Arnstein Ressem
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