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authorJiri Olsa <jolsa@redhat.com>2021-12-06 19:20:32 +0100
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-12-09 19:02:44 +0100
commite1067a07cfbc5a36abad3752fafe4c79e06db1bb (patch)
tree94d47183b6eae6f63d83a179728f99cc64b67ecf /.gitignore
parentftrace: Add cleanup to unregister_ftrace_direct_multi (diff)
downloadlinux-e1067a07cfbc5a36abad3752fafe4c79e06db1bb.tar.xz
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ftrace/samples: Add module to test multi direct modify interface
Adding ftrace-direct-multi-modify.ko kernel module that uses modify_ftrace_direct_multi API. The core functionality is taken from ftrace-direct-modify.ko kernel module and changed to fit multi direct interface. The init function creates kthread that periodically calls modify_ftrace_direct_multi to change the trampoline address for the direct ftrace_ops. The ftrace trace_pipe then shows trace from both trampolines. Link: https://lkml.kernel.org/r/20211206182032.87248-4-jolsa@kernel.org Cc: Ingo Molnar <mingo@redhat.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Tested-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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