[ros-kernel] Re: Cache and memory manager

[<we...@cw...>]

Philip Susi writes
>
>It is more difficult to create and maintain all of these special code
>paths and algorithms for the cache than it would be to simply let the
>existing memory management code do all the work for you like in NT.
>
But the existing memory management code doesn't 'do all the work'
since cached file data and memory mapped files are fundamentally
different things. Most of the time data will either be memory mapped
or the subject of NtReadFile/NtWriteFile and we want the paths for
handling both to be optimized for their specific characteristics not
to kludge one into a special case of the other.

>We do?  Where? 
>
Because every time an application uses a part of a cached file
then it calls (via the filesystem) the cache manager so we can record the
LRU information very easily.

> And how does memory mapped files interact with this cache?
>
My plan was to handle memory mapped data which is also shared
with the cache using the mechanism for paging user data.

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