Messages in this thread | | | Date | Mon, 12 Jun 2006 09:43:17 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH]: Adding a counter in vma to indicate the number of physical pages backing it |
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On Fri, 9 Jun 2006, Rohit Seth wrote:
> 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).
Adding a new counter to a vma may cause a bouncing cacheline etc. I would think that such a counter is far more expensive than occasional scans through the page table because someone is curious about the number of page in use. /proc/<pid>/numa_maps also uses these scans to determine dirty pages etc.
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