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Index: sys/vm/uma_core.c
===================================================================
--- sys/vm/uma_core.c
+++ 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_waste(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,
+ "waste", CTLFLAG_RD | CTLTYPE_INT | CTLFLAG_MPSAFE,
+ keg, 0, sysctl_handle_uma_slab_waste, "I",
+ "Internal fragmentation per-slab");
} else
SYSCTL_ADD_CONST_STRING(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
"name", CTLFLAG_RD, nokeg, "Keg name");
@@ -4440,6 +4445,22 @@
return (error);
}
+static int
+sysctl_handle_uma_slab_waste(SYSCTL_HANDLER_ARGS)
+{
+ uma_keg_t keg = arg1;
+ int waste;
+
+ waste = keg->uk_ppera * (PAGE_SIZE + sizeof(struct vm_page));
+ if ((keg->uk_flags & UMA_ZONE_OFFPAGE) != 0)
+ waste += slab_sizeof(SLAB_MAX_SETSIZE);
+ if ((keg->uk_flags & UMA_ZONE_PCPU) != 0)
+ waste /= mp_maxid + 1;
+ /* The size actually usable by the client is uk_size, not uk_rsize. */
+ waste -= roundup2(keg->uk_size, keg->uk_align + 1) * keg->uk_ipers;
+ return (sysctl_handle_int(oidp, &waste, 0, req));
+}
+
#ifdef INVARIANTS
static uma_slab_t
uma_dbg_getslab(uma_zone_t zone, void *item)

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