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fadv_noreuse
2010 Nov 04
4
fadvise DONTNEED implementation (or lack thereof)
...itten (although never merged, it seems)
incorporating fadvise support, but I found its implementation rather
odd, using mincore() and FADV_DONTNEED to kick out only regions brought
in by rsync. It seemed to me the simpler and more appropriate solution
would be to simply flag every touched file with FADV_NOREUSE and let the
kernel manage automatically expelling used pages.
After looking deeper into the kernel implementation[2] of fadvise() the
reason for using DONTNEED became more apparant. It seems that the kernel
implements NOREUSE as a noop. A little googling revealed[3] that I not
the first person to...