Author: avg
Date: Sat Oct 9 09:03:17 2010
New Revision: 213651
URL: http://svn.freebsd.org/changeset/base/213651
Log:
add kmem_map_free sysctl: query largest contiguous free range in kmem_map
Suggested by: alc
Reviewed by: alc
MFC after: 1 week
Modified:
head/sys/kern/kern_malloc.c
Modified: head/sys/kern/kern_malloc.c
==============================================================================
--- head/sys/kern/kern_malloc.c Sat Oct 9 08:52:09 2010 (r213650)
+++ head/sys/kern/kern_malloc.c Sat Oct 9 09:03:17 2010 (r213651)
@@ -207,6 +207,11 @@ 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");
+static int sysctl_kmem_map_free(SYSCTL_HANDLER_ARGS);
+SYSCTL_PROC(_vm, OID_AUTO, kmem_map_free,
+ CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
+ sysctl_kmem_map_free, "LU", "Largest contiguous free range in kmem_map");
+
/*
* The malloc_mtx protects the kmemstatistics linked list.
*/
@@ -254,6 +259,18 @@ sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS
return (sysctl_handle_long(oidp, &size, 0, req));
}
+static int
+sysctl_kmem_map_free(SYSCTL_HANDLER_ARGS)
+{
+ u_long size;
+
+ vm_map_lock_read(kmem_map);
+ size = kmem_map->root != NULL ?
+ kmem_map->root->max_free : kmem_map->size;
+ vm_map_unlock_read(kmem_map);
+ 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.
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