Messages in this thread |  | | From | David Laight <> | Subject | RE: [PATCH v3 3/3] x86: usercopy: reimplement arch_within_stack_frames with unwinder | Date | Mon, 9 Apr 2018 13:14:58 +0000 |
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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
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