Adjust some variables (mostly related to the buffer cache) that hold

address space sizes to be longs instead of ints.  Specifically, the follow
values are now longs: runningbufspace, bufspace, maxbufspace,
bufmallocspace, maxbufmallocspace, lobufspace, hibufspace, lorunningspace,
hirunningspace, maxswzone, maxbcache, and maxpipekva.  Previously, a
relatively small number (~ 44000) of buffers set in kern.nbuf would result
in integer overflows resulting either in hangs or bogus values of
hidirtybuffers and lodirtybuffers.  Now one has to overflow a long to see
such problems.  There was a check for a nbuf setting that would cause
overflows in the auto-tuning of nbuf.  I've changed it to always check and
cap nbuf but warn if a user-supplied tunable would cause overflow.

Note that this changes the ABI of several sysctls that are used by things
like top(1), etc., so any MFC would probably require a some gross shims
to allow for that.

MFC after:	1 month

1 files changed, 2 insertions, 2 deletions

diff --git a/sys/vm/vnode_pager.c b/sys/vm/vnode_pager.c
index 53658fb..e8c7958 100644
--- a/sys/vm/vnode_pager.c
+++ b/sys/vm/vnode_pager.c
@@ -525,7 +525,7 @@ vnode_pager_input_smlfs(object, m)
 			bp->b_bcount = bsize;
 			bp->b_bufsize = bsize;
 			bp->b_runningbufspace = bp->b_bufsize;
-			atomic_add_int(&runningbufspace, bp->b_runningbufspace);
+			atomic_add_long(&runningbufspace, bp->b_runningbufspace);
 
 			/* do the input */
 			bp->b_iooffset = dbtob(bp->b_blkno);
@@ -905,7 +905,7 @@ vnode_pager_generic_getpages(vp, m, bytecount, reqpage)
 	bp->b_bcount = size;
 	bp->b_bufsize = size;
 	bp->b_runningbufspace = bp->b_bufsize;
-	atomic_add_int(&runningbufspace, bp->b_runningbufspace);
+	atomic_add_long(&runningbufspace, bp->b_runningbufspace);
 
 	PCPU_INC(cnt.v_vnodein);
 	PCPU_ADD(cnt.v_vnodepgsin, count);