[lkml]   [2018]   [Nov]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v3 1/2] kretprobe: produce sane stack traces
On 2018-11-02, Aleksa Sarai <> wrote:
> Unfortunately, I'm having a lot of trouble understanding how the current
> ftrace hooking works -- ORC has a couple of ftrace hooks that seem
> reasonable on the surface but I don't understand (for instance) how
> HAVE_FUNCTION_GRAPH_RET_ADDR_PTR *actually* works. Though your comment
> appears to indicate that it doesn't work for stack traces?

Sorry, I just figured out how it works! (To make sure I actually
understand -- retp is a pointer to the place in the stack where the
return address is stored, so it uniquely specifies what each trampoline
actually points to -- this trick could also be used for kretprobes).

Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
[unhandled content-type:application/pgp-signature]
 \ /
  Last update: 2018-11-02 08:59    [W:0.154 / U:2.944 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site