---

yaml
---
r: 255653
b: refs/heads/master
c: 3847ce3
h: refs/heads/master
i:
  255651: 3dd3fbe
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 296f7ea75b45913d5e2067baef0812087e0b6eb9
+refs/heads/master: 3847ce32aea9fdf56022de132000e8cf139042eb

trunk/include/trace/events/sock.h

@@ -0,0 +1,68 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM sock
+
+#if !defined(_TRACE_SOCK_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SOCK_H
+
+#include <net/sock.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(sock_rcvqueue_full,
+
+	TP_PROTO(struct sock *sk, struct sk_buff *skb),
+
+	TP_ARGS(sk, skb),
+
+	TP_STRUCT__entry(
+		__field(int, rmem_alloc)
+		__field(unsigned int, truesize)
+		__field(int, sk_rcvbuf)
+	),
+
+	TP_fast_assign(
+		__entry->rmem_alloc = atomic_read(&sk->sk_rmem_alloc);
+		__entry->truesize   = skb->truesize;
+		__entry->sk_rcvbuf  = sk->sk_rcvbuf;
+	),
+
+	TP_printk("rmem_alloc=%d truesize=%u sk_rcvbuf=%d",
+		__entry->rmem_alloc, __entry->truesize, __entry->sk_rcvbuf)
+);
+
+TRACE_EVENT(sock_exceed_buf_limit,
+
+	TP_PROTO(struct sock *sk, struct proto *prot, long allocated),
+
+	TP_ARGS(sk, prot, allocated),
+
+	TP_STRUCT__entry(
+		__array(char, name, 32)
+		__field(long *, sysctl_mem)
+		__field(long, allocated)
+		__field(int, sysctl_rmem)
+		__field(int, rmem_alloc)
+	),
+
+	TP_fast_assign(
+		strncpy(__entry->name, prot->name, 32);
+		__entry->sysctl_mem = prot->sysctl_mem;
+		__entry->allocated = allocated;
+		__entry->sysctl_rmem = prot->sysctl_rmem[0];
+		__entry->rmem_alloc = atomic_read(&sk->sk_rmem_alloc);
+	),
+
+	TP_printk("proto:%s sysctl_mem=%ld,%ld,%ld allocated=%ld "
+		"sysctl_rmem=%d rmem_alloc=%d",
+		__entry->name,
+		__entry->sysctl_mem[0],
+		__entry->sysctl_mem[1],
+		__entry->sysctl_mem[2],
+		__entry->allocated,
+		__entry->sysctl_rmem,
+		__entry->rmem_alloc)
+);
+
+#endif /* _TRACE_SOCK_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>

trunk/net/core/net-traces.c

@@ -28,6 +28,7 @@
 #include <trace/events/skb.h>
 #include <trace/events/net.h>
 #include <trace/events/napi.h>
+#include <trace/events/sock.h>
 #include <trace/events/udp.h>
 
 EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);

trunk/net/core/sock.c

@@ -128,6 +128,8 @@
 
 #include <linux/filter.h>
 
+#include <trace/events/sock.h>
+
 #ifdef CONFIG_INET
 #include <net/tcp.h>
 #endif
@@ -292,6 +294,7 @@ int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 	if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
 	    (unsigned)sk->sk_rcvbuf) {
 		atomic_inc(&sk->sk_drops);
+		trace_sock_rcvqueue_full(sk, skb);
 		return -ENOMEM;
 	}
 
@@ -1736,6 +1739,8 @@ int __sk_mem_schedule(struct sock *sk, int size, int kind)
 			return 1;
 	}
 
+	trace_sock_exceed_buf_limit(sk, prot, allocated);
+
 	/* Alas. Undo changes. */
 	sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
 	atomic_long_sub(amt, prot->memory_allocated);