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| author |  Donglin Peng <dolinux.peng@gmail.com>
| 2023-02-21 08:52:42 +0900 |
|---|---|---|
| committer |  Masami Hiramatsu (Google) <mhiramat@kernel.org>
| 2023-02-21 08:52:42 +0900 |
| commit | 8478cca1e3abd183f309cd9c2491f484acf5d377 (patch) | |
| tree | 22623d22350cc9f938a59ddc85b87da6bbb8ffdd /kernel/trace/trace.c | |
| parent | selftests/ftrace: Fix probepoint testcase to ignore __pfx_* symbols (diff) | |
| download | linux-8478cca1e3abd183f309cd9c2491f484acf5d377.tar.gz linux-8478cca1e3abd183f309cd9c2491f484acf5d377.tar.bz2 linux-8478cca1e3abd183f309cd9c2491f484acf5d377.zip | |
tracing/probe: add a char type to show the character value of traced arguments
There are scenes that we want to show the character value of traced
arguments other than a decimal or hexadecimal or string value for debug
convinience. I add a new type named 'char' to do it and a new test case
file named 'kprobe_args_char.tc' to do selftest for char type.
For example:
The to be traced function is 'void demo_func(char type, char *name);', we
can add a kprobe event as follows to show argument values as we want:
echo 'p:myprobe demo_func $arg1:char +0($arg2):char[5]' > kprobe_events
we will get the following trace log:
... myprobe: (demo_func+0x0/0x29) arg1='A' arg2={'b','p','f','1',''}
Link: https://lore.kernel.org/all/20221219110613.367098-1-dolinux.peng@gmail.com/
Signed-off-by: Donglin Peng <dolinux.peng@gmail.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index b677f8d61deb..712ba8d6f91f 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5615,7 +5615,7 @@ static const char readme_msg[] = "\t $stack<index>, $stack, $retval, $comm,\n" #endif "\t +|-[u]<offset>(<fetcharg>), \\imm-value, \\\"imm-string\"\n" - "\t type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string, symbol,\n" + "\t type: s8/16/32/64, u8/16/32/64, x8/16/32/64, char, string, symbol,\n" "\t b<bit-width>@<bit-offset>/<container-size>, ustring,\n" "\t symstr, <type>\\[<array-size>\\]\n" #ifdef CONFIG_HIST_TRIGGERS |