Subject: Re: pmap.c hacking...
To: Andrew Doran <firstname.lastname@example.org>
From: Frank van der Linden <email@example.com>
Date: 03/29/2007 13:42:55
Andrew Doran wrote:
> As an aside the amd64 pmap is lacking the lazy switching that the i386 pmap
> does, which eliminates reloads of %cr3 / TLB flushes when switching to
> kthreads, or when switching between threads within the same process. Also
> IIRC the xen pmap is an old, slightly modified version of the i386 pmap and
> should be merged back in with an #ifdef XEN.
> The amd64 pmap was written to work on i386 too. Can anyone comment on what
> the original issues were that prevented sharing it? Frank?
yamt resolved any remaining issues and came up with a shared pmap. I
agree that it should be shared, however, others disagreed, and the
shared pmap was not committed.
I don't remember what the arguments were. I still think that a shared
pmap should be committed.