Jagadeesh Bhaskar P a écrit :
How can this work? Can someone please help me on this regard?
I think I gave a good overview of the question. I tried to keep things as simple as I could, at the cost of not giving an exact description of how Linux handle COW. For example, there is in fact 3 levels of page table indirections in Linux, but it was not necessary to understand COW.
4-level page tables just were merged into the kernel mainline as of 2.6.10-rc2 - mostly to support the big iron that has almost-terabyte-level system memory (the SGI Altix, some of the big stuff from IBM, some other NUMA machines).
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