K 10
svn:author
V 6
dillon
K 8
svn:date
V 27
2001-11-03T19:59:28.000000Z
K 7
svn:log
V 712
MFC implement kern.maxvnodes (primarily kern/vfs_subr.c 1.326), sync,
and other VM optimizations and fixes.

* Add VOBJDIRTY flag to vnode to avoid certain indirections.
* Turn the mount structure vnode list into an LRU queue (LIST -> TAILQ)
* Attempt to reuse vnodes when we hit the maxvnodes limit
* Optimize msync() to avoid unnecessary v_interlocks
* Optimize ffs_sync() for same
* Fix vm_object double-termination bug
* Add KASSERT to ensure that backing object is not freed out from
  under remaining VM pages.

These fixes change the mount structure and will create a binary kld module
incompatibility with filesystem kld's, but I deem the scaling issues with
4.x that we are fixing to be more important.

END