K 10
svn:author
V 6
dillon
K 8
svn:date
V 27
2000-11-26T02:55:14.000000Z
K 7
svn:log
V 847
MFC the major low memory deadlock solution.  This patch removes most of
the preexisting low-memory-handling hacks and replaces it with a relatively
simple concept:  The entire I/O path (except networking) is allowed to dig
into the system memory reserve but will effectively free resources rather
then leave them wired/cached if the system is found to be in a low-memory
situation, thus allowing I/O to continue to operate.

This patch also fixes a  VXLOCK self-deadlock and generates a message
if it detects what used to be the deadlock.  (this also MFCd)

Finally, this patch removes code related to the case where the original
page could not be found during bogus page recovery and replaces it with a
panic.  The original page had better still exist since we have an extra
reference on it and on the VM object during the I/O.  (this also MFCd)

END