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Index: head/sys/vm/uma_core.c
===================================================================
--- head/sys/vm/uma_core.c
+++ head/sys/vm/uma_core.c
@@ -290,6 +290,7 @@
static int sysctl_handle_uma_zone_allocs(SYSCTL_HANDLER_ARGS);
static int sysctl_handle_uma_zone_frees(SYSCTL_HANDLER_ARGS);
static int sysctl_handle_uma_zone_flags(SYSCTL_HANDLER_ARGS);
+static int sysctl_handle_uma_slab_efficiency(SYSCTL_HANDLER_ARGS);
#ifdef INVARIANTS
static inline struct noslabbits *slab_dbg_bits(uma_slab_t slab, uma_keg_t keg);
@@ -1948,6 +1949,10 @@
SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
"free", CTLFLAG_RD, &keg->uk_free, 0,
"items free in the slab layer");
+ SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
+ "efficiency", CTLFLAG_RD | CTLTYPE_INT | CTLFLAG_MPSAFE,
+ keg, 0, sysctl_handle_uma_slab_efficiency, "I",
+ "Slab utilization (100 - internal fragmentation %)");
} else
SYSCTL_ADD_CONST_STRING(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
"name", CTLFLAG_RD, nokeg, "Keg name");
@@ -4438,6 +4443,27 @@
sbuf_delete(&sbuf);
return (error);
+}
+
+static int
+sysctl_handle_uma_slab_efficiency(SYSCTL_HANDLER_ARGS)
+{
+ uma_keg_t keg = arg1;
+ int avail, effpct, total;
+
+ total = keg->uk_ppera * PAGE_SIZE;
+ if ((keg->uk_flags & UMA_ZONE_OFFPAGE) != 0)
+ total += slab_sizeof(SLAB_MAX_SETSIZE);
+ /*
+ * We consider the client's requested size and alignment here, not the
+ * real size determination uk_rsize, because we also adjust the real
+ * size for internal implementation reasons (max bitset size).
+ */
+ avail = keg->uk_ipers * roundup2(keg->uk_size, keg->uk_align + 1);
+ if ((keg->uk_flags & UMA_ZONE_PCPU) != 0)
+ avail *= mp_maxid + 1;
+ effpct = 100 * avail / total;
+ return (sysctl_handle_int(oidp, &effpct, 0, req));
}
#ifdef INVARIANTS

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