linux-kernel - [PATCH 0/7] add function arguments to ftrace

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Message-ID: <20240904065908.1009086-1-svens@linux.ibm.com>
Date: Wed,  4 Sep 2024 08:58:54 +0200
From: Sven Schnelle <svens@...ux.ibm.com>
To: Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
        Guo Ren <guoren@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-csky@...r.kernel.org
Subject: [PATCH 0/7] add function arguments to ftrace

These patches add support for printing function arguments in ftrace.

Example usage:

function tracer:

cd /sys/kernel/tracing/
echo icmp_rcv >set_ftrace_filter
echo function >current_tracer
echo 1 >options/func-args
ping -c 10 127.0.0.1
[..]
cat trace
[..]
            ping-1277    [030] ..s1.    39.120939: icmp_rcv(skb = 0xa0ecab00) <-ip_protocol_deliver_rcu
            ping-1277    [030] ..s1.    39.120946: icmp_rcv(skb = 0xa0ecac00) <-ip_protocol_deliver_rcu
            ping-1277    [030] ..s1.    40.179724: icmp_rcv(skb = 0xa0ecab00) <-ip_protocol_deliver_rcu
            ping-1277    [030] ..s1.    40.179730: icmp_rcv(skb = 0xa0ecac00) <-ip_protocol_deliver_rcu
            ping-1277    [030] ..s1.    41.219700: icmp_rcv(skb = 0xa0ecab00) <-ip_protocol_deliver_rcu
            ping-1277    [030] ..s1.    41.219706: icmp_rcv(skb = 0xa0ecac00) <-ip_protocol_deliver_rcu
            ping-1277    [030] ..s1.    42.259717: icmp_rcv(skb = 0xa0ecab00) <-ip_protocol_deliver_rcu
            ping-1277    [030] ..s1.    42.259725: icmp_rcv(skb = 0xa0ecac00) <-ip_protocol_deliver_rcu
            ping-1277    [030] ..s1.    43.299735: icmp_rcv(skb = 0xa0ecab00) <-ip_protocol_deliver_rcu
            ping-1277    [030] ..s1.    43.299742: icmp_rcv(skb = 0xa0ecac00) <-ip_protocol_deliver_rcu

function graph:

cd /sys/kernel/tracing
echo icmp_rcv >set_graph_function
echo function_graph >current_tracer
echo 1 >options/funcgraph-args

ping -c 1 127.0.0.1

cat trace

 30)               |  icmp_rcv(skb = 0xa0ecab00) {
 30)               |    __skb_checksum_complete(skb = 0xa0ecab00) {
 30)               |      skb_checksum(skb = 0xa0ecab00, offset = 0, len = 64, csum = 0) {
 30)               |        __skb_checksum(skb = 0xa0ecab00, offset = 0, len = 64, csum = 0, ops = 0x232e0327a88) {
 30)   0.418 us    |          csum_partial(buff = 0xa0d20924, len = 64, sum = 0)
 30)   0.985 us    |        }
 30)   1.463 us    |      }
 30)   2.039 us    |    }
[..]


Sven Schnelle (7):
  tracing: add ftrace_regs to function_graph_enter()
  x86/tracing: pass ftrace_regs to function_graph_enter()
  s390/tracing: pass ftrace_regs to function_graph_enter()
  Add print_function_args()
  tracing: add config option for print arguments in ftrace
  tracing: add support for function argument to graph tracer
  tracing: add arguments to function tracer

 arch/arm/kernel/ftrace.c             |  2 +-
 arch/arm64/kernel/ftrace.c           |  2 +-
 arch/csky/kernel/ftrace.c            |  2 +-
 arch/loongarch/kernel/ftrace.c       |  2 +-
 arch/loongarch/kernel/ftrace_dyn.c   |  2 +-
 arch/microblaze/kernel/ftrace.c      |  2 +-
 arch/mips/kernel/ftrace.c            |  2 +-
 arch/parisc/kernel/ftrace.c          |  2 +-
 arch/powerpc/kernel/trace/ftrace.c   |  2 +-
 arch/riscv/kernel/ftrace.c           |  2 +-
 arch/s390/kernel/entry.h             |  4 +-
 arch/s390/kernel/ftrace.c            |  4 +-
 arch/sh/kernel/ftrace.c              |  2 +-
 arch/sparc/kernel/ftrace.c           |  2 +-
 arch/x86/include/asm/ftrace.h        |  2 +-
 arch/x86/kernel/ftrace.c             |  6 +-
 include/linux/ftrace.h               |  4 +-
 kernel/trace/Kconfig                 | 12 ++++
 kernel/trace/fgraph.c                |  7 ++-
 kernel/trace/trace.c                 |  8 ++-
 kernel/trace/trace.h                 |  4 +-
 kernel/trace/trace_entries.h         |  7 ++-
 kernel/trace/trace_functions.c       | 46 ++++++++++++++--
 kernel/trace/trace_functions_graph.c | 74 +++++++++++++------------
 kernel/trace/trace_irqsoff.c         |  4 +-
 kernel/trace/trace_output.c          | 82 +++++++++++++++++++++++++++-
 kernel/trace/trace_output.h          |  9 +++
 kernel/trace/trace_sched_wakeup.c    |  4 +-
 28 files changed, 228 insertions(+), 73 deletions(-)

--
2.43.0