22 Feb
1999
22 Feb
'99
4:34 p.m.
Hi Robert,
there is one mapping entry per associated page per address space. that means, if you map a page to 2 address spaces you need 2 mappings. The current L4 version allocates the mappings statically (currently 5 entries per frame, but this is configurable at startup time). The idea is, that the kernel can revoke pages from sigma 0, what is not implemented yet. I don't see the case, where you want to map a lot of pages into all address spaces. Furthermore is your calculation not right. You can map a page to multiple address spaces multiple times (at different virtual addresses) - so there is no limit of needed mapping-entries per page.
Volkmar