# Re: \[PATCH 2/2\] mm/page\_ref: add tracepoint to track down page reference manipulation

- From: Sergey Senozhatsky \<hidden\>
- Date: 2016-02-19 02:14:08 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2016/02/4689003
- Thread: https://ratatoskr.run/linux-mm/2016/02/4685299/t.md

```text
On (02/19/16 10:39), Joonsoo Kim wrote:
[..]
> > not sure if it's worth mentioning in the comment, but the other
> > concern here is the performance impact of an extra function call,
> > I believe. otherwise, Joonsoo would just do:
> 
> It's very natural thing so I'm not sure it is worth mentioning.

agree.

> > and in mm/debug_page_ref.c
> >
> > void __page_ref_set(struct page *page, int v)
> > {
> >         if (trace_page_ref_set_enabled())
> >                 trace_page_ref_set(page, v);
> > }
> > EXPORT_SYMBOL(__page_ref_set);
> > EXPORT_TRACEPOINT_SYMBOL(page_ref_set);
> 
> It is what I did in v1.

ah... indeed. well, "That was a year ago, how am I suppose to remember"

	-ss

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```