Ingo Weinhold 7b8683b252 Updated write_to_cache() to use physical pages for I/O and the new
{memset,memcpy_to}_physical() functions.
Mapping lots of physical pages at once as done before was an actual
problem on systems with enough RAM, as the physical page mapper can map
only 64 chunks at a time. So multiple threads could play dining
philosophers, each getting only one of two chopsticks, waiting for
another one to be freed.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28220 a95241bf-73f2-0310-859d-f6bbb57e9c96
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