From: Jesper Dangaard Brouer <redacted>
Date: Fri, 04 Sep 2015 19:00:53 +0200

+/**
+ *	kfree_skb_bulk - bulk free SKBs when refcnt allows to
+ *	@skbs: array of SKBs to free
+ *	@size: number of SKBs in array
+ *
+ *	If SKB refcnt allows for free, then release any auxiliary data
+ *	and then bulk free SKBs to the SLAB allocator.
+ *
+ *	Note that interrupts must be enabled when calling this function.
+ */
+void kfree_skb_bulk(struct sk_buff **skbs, unsigned int size)
+{
+	int i;
+	size_t cnt = 0;
+
+	for (i = 0; i < size; i++) {
+		struct sk_buff *skb = skbs[i];
+
+		if (!skb_dec_and_test(skb))
+			continue; /* skip skb, not ready to free */
+
+		/* Construct an array of SKBs, ready to be free'ed and
+		 * cleanup all auxiliary, before bulk free to SLAB.
+		 * For now, only handle non-cloned SKBs, related to
+		 * SLAB skbuff_head_cache
+		 */
+		if (skb->fclone == SKB_FCLONE_UNAVAILABLE) {
+			skb_release_all(skb);
+			skbs[cnt++] = skb;
+		} else {
+			/* SKB was a clone, don't handle this case */
+			__kfree_skb(skb);
+		}
+	}
+	if (likely(cnt)) {
+		kmem_cache_free_bulk(skbuff_head_cache, cnt, (void **) skbs);
+	}
+}

You're going to have to do a trace_kfree_skb() or trace_consume_skb() for
these things.

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