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

From: Nick Piggin
Date: Tue Jun 13 2006 - 00:26:27 EST


Andi Kleen wrote:

On Monday 12 June 2006 21:42, Rohit Seth wrote:

I think having this information in each vma keeps the impact (of adding new counter) to very
low.

Second question is to advertize this value to user space. Please let me
know what suites the most among /proc, /sys or system call (or if there
is any other mechanism then let me know) for a per process per segment
related information.


I think we first need to identify the basic need.
Don't see why we even need per VMA information so far.


Exactly. There is no question that walking page tables will be slower
than having a counter like your patch does; the question is why we
need it.

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