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Perf tracing wireless driver on LEDE/OpenWRT

2018-07-21

kernel, Linux

Tags:

lede

louie.lu

1. Config LEDE/OpenWRT with

CONFIG_PACKAGE_perf=y
CONFIG_KERNEL_PERF_EVENTS=y

2. Add dynamic probe with external modules

$ perf probe -a -m /lib/modules/4.9.109/ath9k.ko ‘ath_tx*’
$ perf probe -a -m /lib/modules/4.9.109/ath9k.ko ‘ath9k_wake_tx_queue’
$ perf probe -a -m /lib/modules/4.9.109/mac80211.ko ‘fq_*’
$ perf probe -a -m /lib/modules/4.9.109/mac80211.ko ‘ieee80211_tx*’

$ perf probe –a –m /lib/modules/4.9.109/ath9k.ko ‘ath_tx*’

$ perf probe –a –m /lib/modules/4.9.109/ath9k.ko ‘ath9k_wake_tx_queue’

$ perf probe –a –m /lib/modules/4.9.109/mac80211.ko ‘fq_*’

$ perf probe –a –m /lib/modules/4.9.109/mac80211.ko ‘ieee80211_tx*’

3. Perf Recording

# Sample CPU stack traces, only with “probe:” events, by ping, with timestamp 
$ perf record -agT -e ‘probe:*’ ping 192.168.1.150 > /dev/null

1 2	# Sample CPU stack traces, only with “probe:” events, by ping, with timestamp $ perf record –agT –e ‘probe:*’ ping 192.168.1.150 > /dev/null

4. Perf Reporting

# Show perf.data in an ncurses browser (TUI) if possible:
$ perf report

# Show perf.data by function graph:
$ perf report -g

# List all events from perf.data:
perf script

# List all perf.data events, with customized fields (>= Linux 4.1):
perf script -F time,event,trace

# Show perf.data in an ncurses browser (TUI) if possible:

$ perf report

# Show perf.data by function graph:

$ perf report –g

# List all events from perf.data:

perf script

# List all perf.data events, with customized fields (>= Linux 4.1):

perf script –F time,event,trace

Perf tracing wireless driver on LEDE/OpenWRT

1. Config LEDE/OpenWRT with

2. Add dynamic probe with external modules

3. Perf Recording

4. Perf Reporting

5. References

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