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| author | Tiezhu Yang <yangtiezhu@loongson.cn> | 2023-02-25 15:52:57 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-02-25 22:12:17 +0800 |
| commit | 09e679c28a4def4ea8d4f618503c1d55c355ae5c (patch) | |
| tree | a7d7a07593819fd02766c3c4834b2fe4f614e8f0 /fs/nfs/write.c | |
| parent | 3f5536860086d906b01ec5ed68cf50c7edcc40af (diff) | |
LoongArch: Add kprobes on ftrace support
Add kprobe_ftrace_handler() and arch_prepare_kprobe_ftrace() to support
kprobes on ftrace, the code is similar with x86 and riscv.
Here is a simple example:
# echo 'p:myprobe kernel_clone' > /sys/kernel/debug/tracing/kprobe_events
# echo 'r:myretprobe kernel_clone $retval' >> /sys/kernel/debug/tracing/kprobe_events
# echo 1 > /sys/kernel/debug/tracing/events/kprobes/myprobe/enable
# echo 1 > /sys/kernel/debug/tracing/events/kprobes/myretprobe/enable
# echo 1 > /sys/kernel/debug/tracing/tracing_on
# cat /sys/kernel/debug/tracing/trace
# tracer: nop
#
# entries-in-buffer/entries-written: 2/2 #P:4
#
# _-----=> irqs-off/BH-disabled
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> migrate-disable
# |||| / delay
# TASK-PID CPU# ||||| TIMESTAMP FUNCTION
# | | | ||||| | |
bash-488 [002] ..... 2041.190681: myprobe: (kernel_clone+0x0/0x40c)
bash-488 [002] ..... 2041.190788: myretprobe: (__do_sys_clone+0x84/0xb8 <- kernel_clone) arg1=0x200
Tested-by: Jeff Xie <xiehuan09@gmail.com>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'fs/nfs/write.c')
0 files changed, 0 insertions, 0 deletions