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| author | Sven Schnelle <svens@linux.ibm.com> | 2025-02-27 13:58:05 -0500 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-03-04 11:27:23 -0500 |
| commit | 533c20b062d7c25cbcbadb31e3ecb95a08ddb877 (patch) | |
| tree | 5f85cd5b5a8e539b2a26430693091f5059651e47 /kernel/trace/Kconfig | |
| parent | 0c667775fe25eeff988fb5124f390dcf923e93cf (diff) | |
| download | lwn-533c20b062d7c25cbcbadb31e3ecb95a08ddb877.tar.gz lwn-533c20b062d7c25cbcbadb31e3ecb95a08ddb877.zip | |
ftrace: Add print_function_args()
Add a function to decode argument types with the help of BTF. Will
be used to display arguments in the function and function graph
tracer.
It can only handle simply arguments and up to FTRACE_REGS_MAX_ARGS number
of arguments. When it hits a max, it will print ", ...":
page_to_skb(vi=0xffff8d53842dc980, rq=0xffff8d53843a0800, page=0xfffffc2e04337c00, offset=6160, len=64, truesize=1536, ...)
And if it hits an argument that is not recognized, it will print the raw
value and the type of argument it is:
make_vfsuid(idmap=0xffffffff87f99db8, fs_userns=0xffffffff87e543c0, kuid=0x0 (STRUCT))
__pti_set_user_pgtbl(pgdp=0xffff8d5384ab47f8, pgd=0x110e74067 (STRUCT))
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Guo Ren <guoren@kernel.org>
Cc: Donglin Peng <dolinux.peng@gmail.com>
Cc: Zheng Yejian <zhengyejian@huaweicloud.com>
Link: https://lore.kernel.org/20250227185822.639418500@goodmis.org
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Co-developed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/Kconfig')
| -rw-r--r-- | kernel/trace/Kconfig | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index d570b8b9c0a9..60412c1012ef 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -263,6 +263,12 @@ config FUNCTION_GRAPH_RETADDR the function is called. This feature is off by default, and you can enable it via the trace option funcgraph-retaddr. +config FUNCTION_TRACE_ARGS + bool + depends on HAVE_FUNCTION_ARG_ACCESS_API + depends on DEBUG_INFO_BTF + default y + config DYNAMIC_FTRACE bool "enable/disable function tracing dynamically" depends on FUNCTION_TRACER |