[PATCH 1/2] mm: Export vm_committed_as
David Rientjes
rientjes at google.com
Thu Nov 8 22:14:35 UTC 2012
On Thu, 8 Nov 2012, Andrew Morton wrote:
> > > I don't think you should export the symbol itself to modules but rather a
> > > helper function that returns s64 that just wraps
> > > percpu_counter_read_positive() which your driver could use instead.
> > >
> > > (And why percpu_counter_read_positive() returns a signed type is a
> > > mystery.)
> >
> > Yes, this makes sense. I just want to access (read) this metric. Andrew, if you are willing to
> > take this patch, I could send one.
>
> Sure. I suppose that's better, although any module which modifies
> committed_as would never pass review (rofl).
>
I was thinking of a function that all hypervisors can use (since xen also
uses it) that can be well documented and maintain the semantics that they
expect, whether that relines on vm_commited_as in the future or not.
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