* Record until a function call
@ 2021-05-05 7:28 Nicolas Sterchele
2021-05-05 13:04 ` Steven Rostedt
0 siblings, 1 reply; 2+ messages in thread
From: Nicolas Sterchele @ 2021-05-05 7:28 UTC (permalink / raw)
To: linux-trace-devel
Hi there,
I did not find any options permitting to record a trace until a function has been called.
For instance, you want to record every function calls of a specific
process until a specific function has been called.
Before doing this development, I would like to have your thoughts on
this use case? Or if it is already possible?
thx.
--
Nicolas Sterchele
/ni.kɔ.lɑ/ /stɛrʃɛl/
@sterchelen
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Record until a function call
2021-05-05 7:28 Record until a function call Nicolas Sterchele
@ 2021-05-05 13:04 ` Steven Rostedt
0 siblings, 0 replies; 2+ messages in thread
From: Steven Rostedt @ 2021-05-05 13:04 UTC (permalink / raw)
To: Nicolas Sterchele; +Cc: linux-trace-devel
On Wed, 5 May 2021 09:28:23 +0200
Nicolas Sterchele <nicolas@sterchelen.net> wrote:
> Hi there,
>
> I did not find any options permitting to record a trace until a function has been called.
>
> For instance, you want to record every function calls of a specific
> process until a specific function has been called.
> Before doing this development, I would like to have your thoughts on
> this use case? Or if it is already possible?
>
> thx.
>
# trace-cmd start -p function -l '<stop-func>:traceoff '
Where "<stop-func>" is the function you want to stop at.
Note, when trying this out, I realized that there's a bug in the kernel
that it will ignore the "<stop-func>:traceoff" command if it doesn't have a
white space at the end. That's because its been tested with:
# echo "<stop-func>:traceoff" > /sys/kernel/tracing/set_ftrace_filter
and the above command will write just the string, which the kernel will
think there's more to come, but not finish it if the file is closed. That
is:
# echo -n "<stop-func>:traceoff" > /sys/kernel/tracing/set_ftrace_filter
will not work (the -n tells echo to not add a new line).
I'll have to fix that.
To clear it:
# trace-cmd reset
-- Steve
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