lkml.org 
[lkml]   [2018]   [Apr]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: [PATCH v3 3/3] x86: usercopy: reimplement arch_within_stack_frames with unwinder
Date
From: kpark3469@gmail.com
> Sent: 09 April 2018 12:59
>
> The old arch_within_stack_frames which used the frame pointer is
> now reimplemented to use frame pointer unwinder apis. So the main
> functionality is same as before.

How much slower does this make the code?
Following stack frames using %bp is reasonably quick.
I can't imagine some of the other unwinder APIs being any where
near that fast.
While fine for fault tracebacks, using them during usercopy
is likely to have measurable performance impact.

David

\
 
 \ /
  Last update: 2018-04-09 15:14    [W:0.057 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site