Re: [PATCH]: Adding a counter in vma to indicate the number of physical pages backing it

Andrew Morton
2006-06-10T02:42:36Z

On Fri, 09 Jun 2006 18:33:55 -0700
Rohit Seth <rohitseth@google.com> wrote:

> Below is a patch that adds number of physical pages that each vma is
> using in a process. Exporting this information to user space
> using /proc/<pid>/maps interface.

Ouch, that's an awful lot of open-coded incs and decs. Isn't there some
more centralised place we can do this?

What locking protects vma.nphys (can we call this nr_present or something?)

Will this patch do the right thing with weird vmas such as the gate vma and
mmaps of device memory, etc?