Re: [ofa-general] Re: [GIT PULL] please pull ummunotify

[Roland Dreier]

 > I don't remember seeing discussion of this on lkml. Yes it  is in
 > -next...

eg http://lkml.org/lkml/2009/7/31/197 and followups, or search for v2
and earlier patches.

 > Basically it allows app to 'trace itself'? ...with interesting mmap()
 > interface, exporting int to userspace, hoping it behaves atomically...? 

Yes, it allows app to trace what the kernel does to memory mappings.  I
don't believe there's any real issue to atomicity of mmap'ed memory,
since userspace really just tests whether read value is == to old read
value or not.

 - R.
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