Messages in this thread | | | From | Masami Hiramatsu <> | Subject | [RFC PATCH -tip 0/5] kprobes: Abolish jprobe APIs | Date | Fri, 6 Oct 2017 08:13:15 +0900 |
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Hi,
This series abolishes jprobe APIs and remove or disable related code. This is a preparation of removing all jprobe code (including kprobe's break_handler.) I'm not so sure how many jprobe users still exists, but please migrate your tool to trace-event or perf-probe.
As we discussed this thread ( https://lkml.org/lkml/2017/10/2/386 ), we decided to remove jprobe.
Nowadays ftrace and other tracing features are enough matured to replace jprobe use-cases. Users can safely use ftrace and perf probe etc. for their use cases. So we have better way. IOW, jprobe finished its task.
People who still use jprobe, must migrate to other tracing features. Please consider to migrate your tool to following options.
- Use trace-event to trace target function with arguments trace-event is a low-overhead (and almost no visible overhead if it is off) statically defined event interface. You can define new events and trace it via ftrace or any other tracing tools. See following urls, - https://lwn.net/Articles/379903/ - https://lwn.net/Articles/381064/ - https://lwn.net/Articles/383362/
- Use ftrace dynamic events (kprobe event) with perf-probe If you build your kernel with debug info (CONFIG_DEBUG_INFO), you can find which register/stack is assigned to which local variable or arguments by using perf-probe and set up new event to trace it. See following documents, - Documentation/trace/kprobetrace.txt - Documentation/trace/events.txt - tools/perf/Documentation/perf-probe.txt
As far as I can see, tcp probe, dccp probe, sctp probe and lkdtm are using jprobe to probe function. Please consider to migrate.
Thank you,
---
Masami Hiramatsu (5): kprobes: Use ENOTSUPP instead of ENOSYS kprobes: Abolish jprobe APIs kprobes: Disable jprobe test code kprobes: Remove jprobe sample code kprobes: docs: Remove jprobe related document
Documentation/kprobes.txt | 153 +++++++++++++------------------------- include/linux/kprobes.h | 52 ++++++------- kernel/kprobes.c | 6 + kernel/test_kprobes.c | 9 ++ samples/kprobes/Makefile | 2 samples/kprobes/jprobe_example.c | 67 ----------------- 6 files changed, 88 insertions(+), 201 deletions(-) delete mode 100644 samples/kprobes/jprobe_example.c
-- Masami Hiramatsu (Linaro) <mhiramat@kernel.org>
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