| Message ID | 172991731968.443985.4558065903004844780.stgit@devnote2 (mailing list archive) |
|---|---|
| Headers | show |
| Series | tracing: fprobe: function_graph: Multi-function graph and fprobe on fgraph | expand |
Hi Masami, On 10/31/24 10:25, Masami Hiramatsu wrote: > On Sat, 26 Oct 2024 04:43:26 +0000 (UTC) > bot+bpf-ci@kernel.org wrote: > >> Dear patch submitter, >> >> CI has tested the following submission: >> Status: CONFLICT >> Name: [v18,00/17] tracing: fprobe: function_graph: Multi-function graph and fprobe on fgraph >> Patchwork: https://patchwork.kernel.org/project/netdevbpf/list/?series=903367&state=* >> PR: https://github.com/kernel-patches/bpf/pull/7959 >> >> Please rebase your submission onto the most recent upstream change and resubmit >> the patch to get it tested again. >> >> >> Please note: this email is coming from an unmonitored mailbox. If you have >> questions or feedback, please reach out to the Meta Kernel CI team at >> kernel-ci@meta.com. > > Hmm what is the actual basement branch/tree? I guess it is based on bpf. > I'm using the latest linux-trace/for-next. > > Thank you, > Yes, it's using bpf as target tree. Reason this happens is b/c patchset is sent to bpf list but no tag was provided. So KPD guesses and bpf tree is first in list of guesses. If you have ideas on how to better handle this please let us know. Thanks, Daniel
Hi, Here is the 18th version of the series to re-implement the fprobe on function-graph tracer. The previous version is; https://lore.kernel.org/all/172904026427.36809.516716204730117800.stgit@devnote2/ This version fixes the fprobe_header encoding problem[11/17] and and add asm/fprobe.h for arch dependent encoding/decoding[12/17]. Another minor fixes are; - [1/17] Remove unclear comment on arm64 - [2/17] Use PTREGS_SIZE on i386 - [6/17] Fix to use sizeof() for array - [11/17] Fix Kconfig for FPROBE to depend on DYNAMIC_FTRACE_WITH_ARGS Overview -------- This series rewrites the fprobe on this function-graph. The purposes of this change are; 1) Remove dependency of the rethook from fprobe so that we can reduce the return hook code and shadow stack. 2) Make 'ftrace_regs' the common trace interface for the function boundary. 1) Currently we have 2(or 3) different function return hook codes, the function-graph tracer and rethook (and legacy kretprobe). But since this is redundant and needs double maintenance cost, I would like to unify those. From the user's viewpoint, function- graph tracer is very useful to grasp the execution path. For this purpose, it is hard to use the rethook in the function-graph tracer, but the opposite is possible. (Strictly speaking, kretprobe can not use it because it requires 'pt_regs' for historical reasons.) 2) Now the fprobe provides the 'pt_regs' for its handler, but that is wrong for the function entry and exit. Moreover, depending on the architecture, there is no way to accurately reproduce 'pt_regs' outside of interrupt or exception handlers. This means fprobe should not use 'pt_regs' because it does not use such exceptions. (Conversely, kprobe should use 'pt_regs' because it is an abstract interface of the software breakpoint exception.) This series changes fprobe to use function-graph tracer for tracing function entry and exit, instead of mixture of ftrace and rethook. Unlike the rethook which is a per-task list of system-wide allocated nodes, the function graph's ret_stack is a per-task shadow stack. Thus it does not need to set 'nr_maxactive' (which is the number of pre-allocated nodes). Also the handlers will get the 'ftrace_regs' instead of 'pt_regs'. Since eBPF mulit_kprobe/multi_kretprobe events still use 'pt_regs' as their register interface, this changes it to convert 'ftrace_regs' to 'pt_regs'. Of course this conversion makes an incomplete 'pt_regs', so users must access only registers for function parameters or return value. Design ------ Instead of using ftrace's function entry hook directly, the new fprobe is built on top of the function-graph's entry and return callbacks with 'ftrace_regs'. Since the fprobe requires access to 'ftrace_regs', the architecture must support CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS and CONFIG_HAVE_FTRACE_GRAPH_FUNC, which enables to call function-graph entry callback with 'ftrace_regs', and also CONFIG_HAVE_FUNCTION_GRAPH_FREGS, which passes the ftrace_regs to return_to_handler. All fprobes share a single function-graph ops (means shares a common ftrace filter) similar to the kprobe-on-ftrace. This needs another layer to find corresponding fprobe in the common function-graph callbacks, but has much better scalability, since the number of registered function-graph ops is limited. In the entry callback, the fprobe runs its entry_handler and saves the address of 'fprobe' on the function-graph's shadow stack as data. The return callback decodes the data to get the 'fprobe' address, and runs the exit_handler. The fprobe introduces two hash-tables, one is for entry callback which searches fprobes related to the given function address passed by entry callback. The other is for a return callback which checks if the given 'fprobe' data structure pointer is still valid. Note that it is possible to unregister fprobe before the return callback runs. Thus the address validation must be done before using it in the return callback. Download -------- This series can be applied against the ftrace/for-next branch in linux-trace tree. This series can also be found below branch. https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git/log/?h=topic/fprobe-on-fgraph Thank you, --- Masami Hiramatsu (Google) (17): fgraph: Pass ftrace_regs to entryfunc fgraph: Replace fgraph_ret_regs with ftrace_regs fgraph: Pass ftrace_regs to retfunc fprobe: Use ftrace_regs in fprobe entry handler fprobe: Use ftrace_regs in fprobe exit handler tracing: Add ftrace_partial_regs() for converting ftrace_regs to pt_regs tracing: Add ftrace_fill_perf_regs() for perf event tracing/fprobe: Enable fprobe events with CONFIG_DYNAMIC_FTRACE_WITH_ARGS bpf: Enable kprobe_multi feature if CONFIG_FPROBE is enabled ftrace: Add CONFIG_HAVE_FTRACE_GRAPH_FUNC fprobe: Rewrite fprobe on function-graph tracer fprobe: Add fprobe_header encoding feature tracing/fprobe: Remove nr_maxactive from fprobe selftests: ftrace: Remove obsolate maxactive syntax check selftests/ftrace: Add a test case for repeating register/unregister fprobe Documentation: probes: Update fprobe on function-graph tracer bpf: Add get_entry_ip() for arm64 Documentation/trace/fprobe.rst | 42 + arch/arm64/Kconfig | 2 arch/arm64/include/asm/fprobe.h | 7 arch/arm64/include/asm/ftrace.h | 49 + arch/arm64/kernel/asm-offsets.c | 12 arch/arm64/kernel/entry-ftrace.S | 32 + arch/arm64/kernel/ftrace.c | 15 arch/loongarch/Kconfig | 4 arch/loongarch/include/asm/fprobe.h | 5 arch/loongarch/include/asm/ftrace.h | 32 - arch/loongarch/kernel/asm-offsets.c | 12 arch/loongarch/kernel/ftrace_dyn.c | 10 arch/loongarch/kernel/mcount.S | 17 - arch/loongarch/kernel/mcount_dyn.S | 14 arch/powerpc/Kconfig | 1 arch/powerpc/include/asm/ftrace.h | 13 arch/powerpc/kernel/trace/ftrace.c | 2 arch/powerpc/kernel/trace/ftrace_64_pg.c | 10 arch/riscv/Kconfig | 3 arch/riscv/include/asm/fprobe.h | 9 arch/riscv/include/asm/ftrace.h | 45 + arch/riscv/kernel/ftrace.c | 17 - arch/riscv/kernel/mcount.S | 24 - arch/s390/Kconfig | 3 arch/s390/include/asm/fprobe.h | 10 arch/s390/include/asm/ftrace.h | 32 + arch/s390/kernel/asm-offsets.c | 6 arch/s390/kernel/mcount.S | 12 arch/x86/Kconfig | 4 arch/x86/include/asm/fprobe.h | 9 arch/x86/include/asm/ftrace.h | 33 - arch/x86/kernel/ftrace.c | 50 +- arch/x86/kernel/ftrace_32.S | 13 arch/x86/kernel/ftrace_64.S | 17 - include/asm-generic/fprobe.h | 33 + include/linux/fprobe.h | 62 +- include/linux/ftrace.h | 103 +++ include/linux/ftrace_regs.h | 2 kernel/trace/Kconfig | 24 + kernel/trace/bpf_trace.c | 83 ++- kernel/trace/fgraph.c | 62 +- kernel/trace/fprobe.c | 664 +++++++++++++++----- kernel/trace/ftrace.c | 6 kernel/trace/trace.h | 6 kernel/trace/trace_fprobe.c | 146 ++-- kernel/trace/trace_functions_graph.c | 10 kernel/trace/trace_irqsoff.c | 6 kernel/trace/trace_probe_tmpl.h | 2 kernel/trace/trace_sched_wakeup.c | 6 kernel/trace/trace_selftest.c | 11 lib/test_fprobe.c | 51 -- samples/fprobe/fprobe_example.c | 4 .../test.d/dynevent/add_remove_fprobe_repeat.tc | 19 + .../ftrace/test.d/dynevent/fprobe_syntax_errors.tc | 4 54 files changed, 1261 insertions(+), 609 deletions(-) create mode 100644 arch/arm64/include/asm/fprobe.h create mode 100644 arch/loongarch/include/asm/fprobe.h create mode 100644 arch/riscv/include/asm/fprobe.h create mode 100644 arch/s390/include/asm/fprobe.h create mode 100644 arch/x86/include/asm/fprobe.h create mode 100644 include/asm-generic/fprobe.h create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe_repeat.tc -- Masami Hiramatsu (Google) <mhiramat@kernel.org>