Re: [PATCH 11/20 v2] tracing: Add symbol type to function based events

[Steven Rostedt]

On Thu, 8 Feb 2018 12:20:31 +0100
Jiri Olsa <jolsa@xxxxxxxxxx> wrote:

> > +Symbols (function names)
> > +========================
> > +
> > +To display kallsyms "%pS" type of output, use the special type "symbol".
> > +
> > +Again, using gdb to find the offset of the "func" field of struct work_struct
> > +
> > +(gdb) printf "%d\n", &((struct work_struct *)0)->func
> > +24  
> 
> you could also use Arnaldo's pahole for this, seems like less typing:
> 
>   $ pahole ./vmlinux -C work_struct
>   die__process_function: tag not supported (INVALID)!
>   struct work_struct {
>           atomic_long_t              data;                 /*     0     8 */
>           struct list_head           entry;                /*     8    16 */
>           work_func_t                func;                 /*    24     8 */
> 
> it's in 'dwarves' package

Nice, I'll have to document that:

 $ pahole ./vmlinux -C net_device |grep perm
        unsigned char              perm_addr[32];        /*   558    32 */


-- Steve