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selftests/ftrace: Add a testcase for many kprobe events
Add a testcase to test kprobes via ftrace interface with many concurrent kprobe events. This tries to add many kprobe events (up to 256) on kernel functions. To avoid making ftrace-based kprobes (kprobes on fentry), it skips first N bytes (on x86 N=5, on ppc or arm N=4) of function entry. After that, it enables all those events, disable it, and remove it. Since the unoptimization buffer reclaiming will be delayed, after removing events, it will wait enough time. Link: http://lkml.kernel.org/r/149577388470.11702.11832460851769204511.stgit@devbox Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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#!/bin/sh
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# description: Register/unregister many kprobe events
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# ftrace fentry skip size depends on the machine architecture.
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# Currently HAVE_KPROBES_ON_FTRACE defined on x86 and powerpc
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case `uname -m` in
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x86_64|i[3456]86) OFFS=5;;
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ppc*) OFFS=4;;
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*) OFFS=0;;
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esac
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echo "Setup up to 256 kprobes"
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grep t /proc/kallsyms | cut -f3 -d" " | grep -v .*\\..* | \
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head -n 256 | while read i; do echo p ${i}+${OFFS} ; done > kprobe_events ||:
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echo 1 > events/kprobes/enable
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echo 0 > events/kprobes/enable
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echo > kprobe_events
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echo "Waiting for unoptimizing & freeing"
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sleep 5
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echo "Done"
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