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Re: [Xen-devel] [PATCH] x86: move struct bug_frame instances out of line

  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <keir.xen@xxxxxxxxx>
  • Date: Thu, 22 Aug 2013 19:46:17 +0100
  • Delivery-date: Thu, 22 Aug 2013 18:46:45 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>
  • Thread-index: Ac6fZ+JzjfNUjNYy30+sBtHNK8sYHg==
  • Thread-topic: [Xen-devel] [PATCH] x86: move struct bug_frame instances out of line

On 22/08/2013 12:42, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:

> Just like Linux did many years ago, move them into a separate (data)
> section, such that they no longer pollute instruction caches and TLBs.
> Assertion frames, requiring two pointers to be stored, occupy two slots
> in the array, with the second slot mimicking a frame the location
> pointer of which doesn't match any address within .text or .init.text
> (it effectively points back to the slot itself, which - being in a data
> section - can't be reached by non-buggy execution).
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Keir Fraser <keir@xxxxxxx>

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