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From: Frank Ch. Eigler on 19 May 2010 14:00
Hi -

On Wed, May 19, 2010 at 11:08:06PM +0530, Srikar Dronamraju wrote:

> [...] For global tracing we can't use access_process_vm. [...]

Well, we have already demonstrated functional "global tracing" via
access_process_vm, with the trade-off that affected pages are
replicated on a per-process basis. (KSM could end up sharing them
again, one supposes.)

- FChE
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From: Peter Zijlstra on 19 May 2010 14:00
On Wed, 2010-05-19 at 23:08 +0530, Srikar Dronamraju wrote:

> Or do you suggest any alternative methods for global tracing?

COW the page for each existing and future mapping.

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From: Srikar Dronamraju on 19 May 2010 22:30
* Peter Zijlstra <peterz(a)infradead.org> [2010-05-19 19:54:20]:

> On Wed, 2010-05-19 at 23:08 +0530, Srikar Dronamraju wrote:
>
> > Or do you suggest any alternative methods for global tracing?
>
> COW the page for each existing and future mapping.

Yes, we could certainly do this. However we could end up with multiple
copies of the same page. And probably equal number of uprobe and probept
structures.

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Thanks and Regards
Srikar

>
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