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

>> 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?
>
BTW, what is smaps used for (who uses it), anyway?


Jan Engelhardt
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References:
- [PATCH]: Adding a counter in vma to indicate the number of physical pages backing it
  - From: Rohit Seth <[email protected]>
- Re: [PATCH]: Adding a counter in vma to indicate the number of physical pages backing it
  - From: Nick Piggin <[email protected]>

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