lkml.org 
[lkml]   [2018]   [May]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v7 00/16] tracing: probeevent: Improve fetcharg features
On Sat, 5 May 2018 11:38:03 +0900
Masami Hiramatsu <mhiramat@kernel.org> wrote:

> On Fri, 4 May 2018 12:06:42 -0400
> Steven Rostedt <rostedt@goodmis.org> wrote:
>
> > On Sat, 5 May 2018 00:48:28 +0900
> > Masami Hiramatsu <mhiramat@kernel.org> wrote:
> >
> > > So the syntax will be
> > >
> > > p[:EVENT] SYM[(CAST)|+OFFS] [FETCHARG]
> > >
> > > And here is an example;
> > >
> > > p:myevent vfs_read(void *file, char *buf, size_t count, void *pos) $arg1 $arg2
> >
> > If we do this, why bother with $arg1 $arg2?
>
> User may want to trace only some of them. :)

Yes, and this is why I like my solution of the NULL parameter, and you
don't need to show anything after what you want.

p:myevent vfs_read(void *file, NULL, size_t count)

would only trace file and count, and ignore buf and pos.

-- Steve

\
 
 \ /
  Last update: 2018-05-07 17:22    [W:0.226 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site