Explicitly wire the user buffer rather than doing it implicitly in

sbuf_new_for_sysctl(9).  This allows using an sbuf with a SYSCTL_OUT
drain for extremely large amounts of data where the caller knows that
appropriate references are held, and sleeping is not an issue.

Inspired by:	rwatson

1 files changed, 6 insertions, 0 deletions

diff --git a/sys/kern/kern_malloc.c b/sys/kern/kern_malloc.c
index 9c7ff40..a3a9795 100644
--- a/sys/kern/kern_malloc.c
+++ b/sys/kern/kern_malloc.c
@@ -862,6 +862,9 @@ sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS)
 	int error, i;
 	struct sbuf sbuf;
 
+	error = sysctl_wire_old_buffer(req, 0);
+	if (error != 0)
+		return (error);
 	sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
 	mtx_lock(&malloc_mtx);
 
@@ -1019,6 +1022,9 @@ sysctl_kern_mprof(SYSCTL_HANDLER_ARGS)
 	waste = 0;
 	mem = 0;
 
+	error = sysctl_wire_old_buffer(req, 0);
+	if (error != 0)
+		return (error);
 	sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
 	sbuf_printf(&sbuf, 
 	    "\n  Size                    Requests  Real Size\n");