75 lines
1.3 KiB
Bash
75 lines
1.3 KiB
Bash
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: event tracing - restricts events based on pid
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# flags: instance
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do_reset() {
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echo > set_event
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echo > set_event_pid
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echo 0 > options/event-fork
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clear_trace
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}
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fail() { #msg
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do_reset
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echo $1
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exit_fail
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}
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yield() {
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ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
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}
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if [ ! -f set_event -o ! -d events/sched ]; then
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echo "event tracing is not supported"
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exit_unsupported
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fi
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if [ ! -f set_event_pid ]; then
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echo "event pid filtering is not supported"
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exit_unsupported
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fi
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reset_tracer
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do_reset
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echo 1 > events/sched/sched_switch/enable
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yield
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count=`cat trace | grep sched_switch | wc -l`
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if [ $count -eq 0 ]; then
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fail "sched_switch events are not recorded"
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fi
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do_reset
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read mypid rest < /proc/self/stat
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echo $mypid > set_event_pid
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echo 'sched:sched_switch' > set_event
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yield
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count=`cat trace | grep sched_switch | grep -v "pid=$mypid" | wc -l`
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if [ $count -ne 0 ]; then
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fail "sched_switch events from other task are recorded"
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fi
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do_reset
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echo $mypid > set_event_pid
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echo 1 > options/event-fork
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echo 1 > events/sched/sched_switch/enable
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yield
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count=`cat trace | grep sched_switch | grep -v "pid=$mypid" | wc -l`
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if [ $count -eq 0 ]; then
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fail "sched_switch events from other task are not recorded"
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fi
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do_reset
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exit 0
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