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ftracetest: Clear trace buffer after running kprobe testcases
The kprobe testcases create, use and delete dynamic events during the test but didn't clear the trace buffer so it'll leave the result after it finishes. # ./ftracetest ... # cat trace # tracer: nop # # entries-in-buffer/entries-written: 2/2 #P:12 # # _-----=> irqs-off # / _----=> need-resched # | / _---=> hardirq/softirq # || / _--=> preempt-depth # ||| / delay # TASK-PID CPU# |||| TIMESTAMP FUNCTION # | | | |||| | | ftracetest-26474 [009] d..1 79417.143782: Unknown type 1099 ftracetest-26498 [009] d..1 79417.208034: Unknown type 1101 Link: http://lkml.kernel.org/r/1415239470-28705-2-git-send-email-namhyung@kernel.org Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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4 changed files with 4 additions and 0 deletions
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@ -9,3 +9,4 @@ echo p:myevent do_fork > kprobe_events
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grep myevent kprobe_events
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test -d events/kprobes/myevent
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echo > kprobe_events
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clear_trace
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@ -11,3 +11,4 @@ echo 1 > events/kprobes/myevent/enable
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echo > kprobe_events && exit 1 # this must fail
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echo 0 > events/kprobes/myevent/enable
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echo > kprobe_events # this must succeed
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clear_trace
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@ -12,5 +12,6 @@ echo 1 > events/kprobes/testprobe/enable
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( echo "forked")
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echo 0 > events/kprobes/testprobe/enable
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echo "-:testprobe" >> kprobe_events
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clear_trace
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test -d events/kprobes/testprobe && exit 1 || exit 0
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@ -12,4 +12,5 @@ echo 1 > events/kprobes/testprobe2/enable
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( echo "forked")
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echo 0 > events/kprobes/testprobe2/enable
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echo '-:testprobe2' >> kprobe_events
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clear_trace
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test -d events/kprobes/testprobe2 && exit 1 || exit 0
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