For storing swapslots aobj's select between a hashtable or an array
(sizes vary between a page and the kernel address space), by definition
we only need one of those, so make it a union and possibly shave some
bytes.
ok?
been running with this for a while, I hit swap daily and my machine
allocs a lot of uaos.
-0-
Index: uvm_aobj.c
===================================================================
RCS file: /cvs/src/sys/uvm/uvm_aobj.c,v
retrieving revision 1.51
diff -u -p -r1.51 uvm_aobj.c
--- uvm_aobj.c 2 Jul 2010 02:08:53 -0000 1.51
+++ uvm_aobj.c 27 Apr 2011 12:37:35 -0000
@@ -147,12 +147,16 @@ struct uvm_aobj {
struct uvm_object u_obj; /* has: lock, pgops, memt, #pages, #refs */
int u_pages; /* number of pages in entire object */
int u_flags; /* the flags (see uvm_aobj.h) */
- int *u_swslots; /* array of offset->swapslot mappings */
- /*
- * hashtable of offset->swapslot mappings
- * (u_swhash is an array of bucket heads)
- */
- struct uao_swhash *u_swhash;
+ /*
+ * Either an array or hashtable (array of bucket heads) of
+ * offset -> swapslot mappings for the aobj.
+ */
+#define u_swslots u_swap.slot_array
+#define u_swhash u_swap.slot_hash
+ union swslots {
+ int *slot_array;
+ struct uao_swhash *slot_hash;
+ } u_swap;
u_long u_swhashmask; /* mask for hashtable */
LIST_ENTRY(uvm_aobj) u_list; /* global list of aobjs */
};
--
I used to work in a fire hydrant factory. You couldn't park anywhere
near the place.
-- Steven Wright
