# Re: \[PATCH v3 6/7\] mm: make clear\_huge\_page cache clear only around the fault address

- From: Andrea Arcangeli \<hidden\>
- Date: 2012-08-16 19:42:44 
- List: linux-sh
- Page: https://ratatoskr.run/linux-sh/2012/08/3909700
- Thread: https://ratatoskr.run/linux-mm/2012/08/3909510/t.md

```text
On Thu, Aug 16, 2012 at 09:37:25PM +0300, Kirill A. Shutemov wrote:
> On Thu, Aug 16, 2012 at 08:29:44PM +0200, Andrea Arcangeli wrote:
> > On Thu, Aug 16, 2012 at 07:43:56PM +0300, Kirill A. Shutemov wrote:
> > > Hm.. I think with static_key we can avoid cache overhead here. I'll try.
> > 
> > Could you elaborate on the static_key? Is it some sort of self
> > modifying code?
> 
> Runtime code patching. See Documentation/static-keys.txt. We can patch it
> on sysctl.

I guessed it had to be patching the code, thanks for the
pointer. It looks a perfect fit for this one agreed.
```