Messages in this thread | | | From | Jiri Olsa <> | Subject | [PATCH 0/8] x86/ftrace: Add direct batch interface | Date | Tue, 31 Aug 2021 11:50:09 +0200 |
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hi, adding interface to maintain multiple direct functions within single calls. It's a base for follow up bpf batch attach functionality.
New interface:
int register_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr) int unregister_ftrace_direct_multi(struct ftrace_ops *ops) int modify_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr)
that allows to register/unregister/modify direct function 'addr' with struct ftrace_ops object. The ops filter can be updated before with ftrace_set_filter_ip calls
1) patches (1-4) that fix the ftrace graph tracing over the function with direct trampolines attached 2) patches (5-8) that add batch interface for ftrace direct function register/unregister/modify
Also available at (based on Steven's ftrace/core branch): https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git ftrace/direct
thanks, jirka
--- Jiri Olsa (6): x86/ftrace: Remove extra orig rax move tracing: Add trampoline/graph selftest ftrace: Add ftrace_add_rec_direct function ftrace: Add multi direct register/unregister interface ftrace: Add multi direct modify interface ftrace/samples: Add multi direct interface test module
Steven Rostedt (VMware) (2): x86/ftrace: Remove fault protection code in prepare_ftrace_return x86/ftrace: Make function graph use ftrace directly
arch/x86/include/asm/ftrace.h | 9 +++-- arch/x86/kernel/ftrace.c | 71 +++++++++++++++++++------------------- arch/x86/kernel/ftrace_64.S | 30 +--------------- include/linux/ftrace.h | 26 ++++++++++++++ kernel/trace/fgraph.c | 6 ++-- kernel/trace/ftrace.c | 214 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------- kernel/trace/trace_selftest.c | 49 +++++++++++++++++++++++++- samples/ftrace/Makefile | 1 + samples/ftrace/ftrace-direct-multi.c | 52 ++++++++++++++++++++++++++++ 9 files changed, 364 insertions(+), 94 deletions(-) create mode 100644 samples/ftrace/ftrace-direct-multi.c
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