Certainly, but the requirement here is for an in-memory fs, as I read
the email.
Nicolas Williams wrote:
On Mon, Jan 22, 2007 at 09:59:56AM -0600, John Stanton wrote:
A neat way to implement a pager is to memory map a file to make it
shared virtual memory. Then you need some form of mutex to synchronize
access to it. If you are sharing it between processes or threads you
need a lock flag on each page. If you make your shared area a named
file rather than an anonymous space and write through it your cache can
be persistent.
You may need a free list of deleted pages to avoid checkerboarding.
The benefit of the virtual memory approach is that you are not
constrained by available memory and your application becomes more portable.
But you would be constrained by memory model (i.e., 32-bit is too
small), unless you move mmap windows about the file, which would be a
pain.
Nico
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