Messages in this thread | | | Subject | Re: [PATCH]: Adding a counter in vma to indicate the number of physical pages backing it | From | Rohit Seth <> | Date | Mon, 12 Jun 2006 10:49:23 -0700 |
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On Fri, 2006-06-09 at 19:42 -0700, Andrew Morton wrote: > 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? >
I'll look into this. Possibly combining it with mm counters.
> What locking protects vma.nphys (can we call this nr_present or something?) >
I'll need to use the same atomic counters as mm. And Yes nr_present is a better name.
> Will this patch do the right thing with weird vmas such as the gate vma and > mmaps of device memory, etc? >
I think so. (though strictly speaking those special vmas are less interesting). But final solution (if we do decide to implement this counter) will address that.
-rohit
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