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[213.175.37.12]) by smtp.gmail.com with ESMTPSA id c5sm11385326wml.9.2021.10.08.02.13.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Oct 2021 02:13:37 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa To: "Steven Rostedt (VMware)" Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Subject: [PATCHv2 0/8] x86/ftrace: Add direct batch interface Date: Fri, 8 Oct 2021 11:13:28 +0200 Message-Id: <20211008091336.33616-1-jolsa@kernel.org> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 v2 changes: - added comments to API functions - move common cleanup code to new remove_direct_functions_hash function - added addr argument to unregister_ftrace_direct_multi API, to properly cleanup direct_functions hash - added missing unregister_ftrace_direct call to trampoline/graph selftest - added comment to modify_ftrace_direct_multi about non-callback gap between ftrace_shutdown and ftrace_startup 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 | 268 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------ kernel/trace/trace_selftest.c | 54 ++++++++++++++++++++++- samples/ftrace/Makefile | 1 + samples/ftrace/ftrace-direct-multi.c | 52 ++++++++++++++++++++++ 9 files changed, 420 insertions(+), 97 deletions(-) create mode 100644 samples/ftrace/ftrace-direct-multi.c