57 lines
1.2 KiB
Plaintext
57 lines
1.2 KiB
Plaintext
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Kprobe dynamic event with function tracer
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[ -f kprobe_events ] || exit_unsupported # this is configurable
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grep function available_tracers || exit_unsupported # this is configurable
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# prepare
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echo nop > current_tracer
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echo _do_fork > set_ftrace_filter
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echo 0 > events/enable
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echo > kprobe_events
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echo 'p:testprobe _do_fork' > kprobe_events
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# kprobe on / ftrace off
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echo 1 > events/kprobes/testprobe/enable
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echo > trace
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( echo "forked")
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grep testprobe trace
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! grep '_do_fork <-' trace
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# kprobe on / ftrace on
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echo function > current_tracer
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echo > trace
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( echo "forked")
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grep testprobe trace
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grep '_do_fork <-' trace
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# kprobe off / ftrace on
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echo 0 > events/kprobes/testprobe/enable
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echo > trace
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( echo "forked")
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! grep testprobe trace
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grep '_do_fork <-' trace
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# kprobe on / ftrace on
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echo 1 > events/kprobes/testprobe/enable
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echo function > current_tracer
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echo > trace
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( echo "forked")
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grep testprobe trace
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grep '_do_fork <-' trace
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# kprobe on / ftrace off
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echo nop > current_tracer
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echo > trace
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( echo "forked")
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grep testprobe trace
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! grep '_do_fork <-' trace
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# cleanup
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echo nop > current_tracer
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echo > set_ftrace_filter
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echo 0 > events/kprobes/testprobe/enable
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echo > kprobe_events
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echo > trace
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