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
