[ros-kernel] AW: Re: AW: Re: Cache and memory manager

[Hartmut B. <har...@te...>]

> -----Ursprungliche Nachricht-----
> Von:	David Welch [SMTP:we...@cw...]
> Gesendet am:	Montag, 22. Oktober 2001 23:18
> An:	ros...@re...
> Betreff:	[ros-kernel] Re: AW: Re: Cache and memory manager
>
> > For implementation of the cache manager and some of the functions above, 
> > I have moved the code, which will access the cache segments, from vfatfs to 
> > some Cc-functions. Currently I work at point 4 and 5 and will correct some things 
> > in the page out and access violation functions for virtual memory.
> > 
> I'm also working on the memory manager. I would like to agree a strategy 
> and a general division of labour among everyone working on this part of 
> the kernel before any further changes are made. The existing working set 
> code is from an experiment with paging from a long time ago; I propose 
> replacing it, with each page having an associated list of reverse mappings 
> (i.e. a structure giving the process and address where the page is 
> mapped) and a number of different queues of pages (mapped, unmapped dirty, 
> unmapped clean, etc) in pseudo-LRU order which are used to select pages to 
> be written out. Also the existing cache manager should be kept; I have 
> some changes to improve performance and to manage the amount of memory 
> used for caching. An interface compatible with NT can be exported if 
> desired but this will not, in my view, increase the chances of any NT 
> filesystems running. I would also like to export the previous interface 
> for native, high preformance filesystems.

When you also work on the memory manger, I do only fix the bugs in mm/pagefile.c. 
Phillip wrote in the other answer to my mail, that vfatfs must handle synchronous 
and asynchronous requests. Vfatfs has more problems. The code isn't thread safe. 
I will work on this part. 

- Hartmut

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