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

[Nick Piggin]

Rohit Seth 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.
>
> There is currently /proc/<pid>/smaps that prints the detailed
> information about the usage of physical pages but that is a very
> expensive operation as it traverses all the PTs (for some one who is
> just interested in getting that data for each vma).

Yet more cacheline footprint in the page fault and unmap paths...

What is this used for and why do we want it? Could you do some
smaps-like interface that can work on ranges of memory, and
continue to walk pagetables instead?

--
SUSE Labs, Novell Inc.
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