17 Apr
2003
17 Apr
'03
9:45 a.m.
I am fairly sure that 4.2BSD had manual pages for
mmap, but it didn't
work.
Right. Joy left Berkeley and joined Sun and the work got done at Sun.
I'm pretty sure that SunOS 4.0 was the first release with mmap working
as it was described. I was at Sun for the 4.1 release; 4.0 was the new
VM system, and it wasn't "new" like "we changed some stuff", it
was new
as in everything was rewritten. The 4.0 VM system had segmap, read/write
were implemented with segmap in the kernel (you did a read, the kernel
mapped page, started a bcopy and would fault on itself if the page wasn't
there or had no TLB entry). Etc. I have postscript of the papers on
that, still very good reading if someone wants them.
--
---
Larry McVoy lm at bitmover.com http://www.bitmover.com/lm