FreeBSD cache memory allocation

[John Baldwin]

On Wednesday 14 November 2007 11:11:41 am Rob Belics wrote:
> Someone I can't stand said this about FreeBSD.  Though I know C, I don't 
> know anything about this and would love to respond. My first thought was 
> 'contigmalloc' but I'm not sure it's equivalent.
> [QUOTE]The kernel is really lacking some features. They need a method to 
> set precise type of memory cache but BSD doesn't provide way to specify 
> memory cache.
> 
> For that reason MS has the beautiful 
> MmAllocateContigousMemorySpecifyCache()[/QUOTE]

For kernel memory on i386 and amd64 in 6.3 and later you can use 
pmap_change_attr() to adjust the caching mode of memory after you have 
allocated it.   It is best used only with allocations that are a multiple of 
the page size.

-- 
John Baldwin