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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2008-12-13 20:18:13 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-17 00:26:36 +0100 |
| commit | 66896a85cf2890b6bbbc4c9ccdcd296600ffbf89 (patch) | |
| tree | ad6b0a4df65a59280163f5b8ab0b92b2fe54c283 /kernel/trace/trace.h | |
| parent | 2c2d7329d8afa9efa3ec24e19a53e7be9d14f242 (diff) | |
| download | op-kernel-dev-66896a85cf2890b6bbbc4c9ccdcd296600ffbf89.zip op-kernel-dev-66896a85cf2890b6bbbc4c9ccdcd296600ffbf89.tar.gz | |
tracing/ftrace: add the printk-msg-only option
Impact: display ftrace_printk messages "as is"
By default, ftrace_printk() messages find their output with some other
informations like pid, caller, ...
Sometimes a developer just want to have the ftrace_printk left "as is", without
other information.
This is done by providing a default-off option called printk-msg-only.
To enable it, just do `echo printk-msg-only > /debugfs/tracing/trace_options`
Before the patch:
<...>-2739 [000] 145.692153: __might_sleep: I'm an ftrace_printk msg in __might_sleep
<...>-2739 [000] 145.692155: __might_sleep: I'm another ftrace_printk msg in __might_sleep
After the patch and the printk-msg-only option enabled:
I'm an ftrace_printk msg in __might_sleep
I'm another ftrace_printk msg in __might_sleep
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index f07c246..fc75dce 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -578,7 +578,8 @@ enum trace_iterator_flags { TRACE_ITER_BRANCH = 0x1000, TRACE_ITER_ANNOTATE = 0x2000, TRACE_ITER_USERSTACKTRACE = 0x4000, - TRACE_ITER_SYM_USEROBJ = 0x8000 + TRACE_ITER_SYM_USEROBJ = 0x8000, + TRACE_ITER_PRINTK_MSGONLY = 0x10000 }; /* |
