vm.kmem_map_size: a sysctl to query current kmem_map->size

Based on a patch from Sandvine Incorporated via emaste.

Reviewed by:	emaste
MFC after:	1 week

1 files changed, 14 insertions, 0 deletions

diff --git a/sys/kern/kern_malloc.c b/sys/kern/kern_malloc.c
index d913ccf..ee45e3a 100644
--- a/sys/kern/kern_malloc.c
+++ b/sys/kern/kern_malloc.c
@@ -202,6 +202,11 @@ static u_int vm_kmem_size_scale;
 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_scale, CTLFLAG_RDTUN, &vm_kmem_size_scale, 0,
     "Scale factor for kernel memory size");
 
+static int sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS);
+SYSCTL_PROC(_vm, OID_AUTO, kmem_map_size,
+    CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
+    sysctl_kmem_map_size, "LU", "Current kmem_map allocation size");
+
 /*
  * The malloc_mtx protects the kmemstatistics linked list.
  */
@@ -240,6 +245,15 @@ SYSCTL_INT(_debug_malloc, OID_AUTO, failure_count, CTLFLAG_RD,
     &malloc_failure_count, 0, "Number of imposed M_NOWAIT malloc failures");
 #endif
 
+static int
+sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS)
+{
+	u_long size;
+
+	size = kmem_map->size;
+	return (sysctl_handle_long(oidp, &size, 0, req));
+}
+
 /*
  * malloc(9) uma zone separation -- sub-page buffer overruns in one
  * malloc type will affect only a subset of other malloc types.