Re: [PATCH v4 0/13] Uprobes v4

[Srikar Dronamraju]

* Peter Zijlstra <peterz@xxxxxxxxxxxxx> [2010-05-19 16:17:40]:

> On Wed, 2010-05-19 at 11:38 +0530, Srikar Dronamraju wrote:
> > 
> > Also when uprobes implements global tracing support (i.e probing a
> > particular symbol in a dso across processes), it has to rely on
> > background page replacement. 
> 
> Uhm, how so?

For global tracing we cant use access_process_vm. The equivalent to
access_process_vm for global tracing would be to use copy_to_user.

However I am sure people wouldnt be happy using copy_to_user on a page
that other processes could have mapped. 

So that leaves us with background page replacement method. 
I do agree that we will not be using the same routine. But the technique
should be something similar(or do you disagree?). 

Or do you suggest any alternative methods for global tracing?

--
Thanks and Regards
Srikar
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