Perf
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| + | ===The Basics=== | ||
| + | <source lang="bash"> | ||
| + | # Unrestrict the kernel symbol maps | ||
| + | echo -n 0 | sudo tee /proc/sys/kernel/kptr_restrict > /dev/null | ||
| + | |||
| + | # start the process, and get its PID | ||
| + | |||
| + | # record some data, to perf.data (kill perf when done) | ||
| + | perf record -p ${PID} | ||
| + | |||
| + | # review the recorded data | ||
| + | perf report --stdio | ||
| + | </source> | ||
| + | |||
| + | ===Record a Call Graph=== | ||
| + | <source lang="bash"> | ||
| + | perf record -g -p ${PID} | ||
| + | </source> | ||
| + | |||
| + | ===Record for 30 seconds=== | ||
| + | <source lang="bash"> | ||
| + | perf record -p ${PID} sleep 30 | ||
| + | </source> | ||
Revision as of 16:19, 19 February 2015
Contents |
Install
apt-get install linux-tools-common linux-tools-$(uname -r)
Using
The Basics
# Unrestrict the kernel symbol maps echo -n 0 | sudo tee /proc/sys/kernel/kptr_restrict > /dev/null # start the process, and get its PID # record some data, to perf.data (kill perf when done) perf record -p ${PID} # review the recorded data perf report --stdio
Record a Call Graph
perf record -g -p ${PID}
Record for 30 seconds
perf record -p ${PID} sleep 30
