36 lines
1.6 KiB
Text
36 lines
1.6 KiB
Text
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#! /bin/bash
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#
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# get a flamegraph of where the watchdog is called from to create a
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# visualization of where interactive responsiveness is poor
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# a) systemwide profiles on the rare 'futimesat' syscall that x86_64 coolwsd
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# calls from its watchdog for the length of time requested. The env variable
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# COOL_WATCHDOG must be set to trigger these.
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# d) generates flamegraph after
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if ! test `id -u` = 0; then
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echo "not root, if this doesn't work try sudo watchdog-cool"
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fi
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if [ $# -ne 1 ]; then
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echo "Usage: watchdog-cool NUMBER[SUFFIX], e.g. watchdog-cool 1h"
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exit 1
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fi
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if ! which flamegraph.pl > /dev/null 2>&1; then
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REAL_USER_HOME="$(getent passwd $SUDO_USER | cut -d: -f6)"
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PATH=$PATH:$HOME/FlameGraph:$REAL_USER_HOME/FlameGraph
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fi
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if ! which flamegraph.pl > /dev/null 2>&1; then
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echo "no flamegraph.pl found"
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echo "On fedora install systemwide with: sudo dnf install flamegraph"
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echo "Otherwise install locally manually into ~/FlameGraph"
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echo " e.g. git clone https://github.com/brendangregg/FlameGraph ~/FlameGraph"
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exit 1
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fi
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perf record -F50 -o perf.data.watchdog -e syscalls:sys_enter_futimesat --call-graph dwarf -a sleep $1
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#alternatively record every nth sample
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#perf record -c12 -o perf.data.watchdog -e syscalls:sys_enter_futimesat --call-graph dwarf -a sleep $1
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perf script -i perf.data.watchdog --no-inline | stackcollapse-perf.pl | \
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sed -E -s "s/^kitbroker[^;]+/kitbroker/" | \
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sed -E -s "s/^docbroker[^;]+/docbroker/" | \
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sed -E -s "s/^kit_spare[^;]+/kit_spare/" | \
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flamegraph.pl > watchdog.svg
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echo generated flamegraph output svg: watchdog.svg
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