d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Mention the removal of UPAGES, the return-to-userspace fork(), and the fast

Browse Source 
complete implementation of vfork().
This commit is contained in:
peter 1997-05-05 05:58:33 +00:00
parent 0d0068a444
commit 3f1ea1975a
1 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
release/sysinstall/help/relnotes.hlp
View File

@ -34,13 +34,28 @@ previous hackery involving struct in_ifaddr and arpcom. Get rid of the
abominable multi_kludge.
The new if_media selection method for ethernet drivers has been brought
in, obtained from Jason Thorpe's NetBSD implementation.
in, obtained from Jason Thorpe's implementation for NetBSD.
Multi-session ISO-9660 CD-ROMs are now fully supported. By default, the
last session will be mounted (including for root mounts). For non-root
mounts, mount_cd9660(8) can take an argument to mount a particular
session instead of the default one.
The UPAGES are gone from the per-process address space which allows
complete address space and page table sharing by reference count.
Newly forked child processes return directly to user mode rather than
return up through the fork() syscall tree. This eliminates the kernel
stack copy at fork time and simplifies certain other internal operations.
It is also needed to support the removal of the UPAGES. (The idea for
this originally came from NetBSD, but we did it for different reasons.)
vfork() is now fully functional by taking advantage of the new sharing
semantics and a significant speedup has been measured. This can be
disabled via the kern.fast_vfork sysctl variable in case of problems.
Statically linked binaries from older releases and other BSD platforms
are a problem since there was a bug in the 4.4BSD (net2, Lite and Lite2)
popen() implementation.
2. Supported Configurations
---------------------------