Re: [Patch] mm tracepoints

[Ingo Molnar <mingo@elte.hu>]

* Larry Woodman <lwoodman@redhat.com> wrote:

> > Would that be useless or controversial? We know from 
> > vma->mapping which inode it maps to. Knowing which file is 
> > faulting in can be useful - especially when addresses are a 
> > moving target such as under PIE or with dlopen(), etc.
> > 
> > 	Ingo
> 
> Attached is the updated patch that applies and builds 
> correctly (sorry I missed the lockdep tracepoints that were 
> added at the last minute). [...]

Looks pretty good and useful to me. I've Cc:-ed more mm folks, 
it would be nice to hear their opinion about these tracepoints.

Andrew, Nick, Peter, what do you think?

About the motivation of these tracepoints: i suspect these 
tracepoints reflect your years-long experience in dealing with 
various MM regressions in the enterprise space and these 
tracepoints would help understand such regressions 
faster/easier?

> [...]  As far as the filename:offset is concerned I am working 
> on that.  Its not as simple as it looks because we have to 
> follow a variable list of structs that can be null terminated 
> several places along the way.

It's definitely not simple! I dont think it should be in this 
base patch at all - it should be an add-on.

	Ingo