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authorSatoru Moriya <satoru.moriya@hds.com>2011-06-17 12:00:03 +0000
committerDavid S. Miller <davem@davemloft.net>2011-06-21 16:06:10 -0700
commit3847ce32aea9fdf56022de132000e8cf139042eb (patch)
tree02edbf97518be8af9a1ce978f7e9fcefdc7e0db1 /net/core/sock.c
parentudp: add tracepoints for queueing skb to rcvbuf (diff)
downloadlinux-dev-3847ce32aea9fdf56022de132000e8cf139042eb.tar.xz
linux-dev-3847ce32aea9fdf56022de132000e8cf139042eb.zip
core: add tracepoints for queueing skb to rcvbuf
This patch adds 2 tracepoints to get a status of a socket receive queue and related parameter. One tracepoint is added to sock_queue_rcv_skb. It records rcvbuf size and its usage. The other tracepoint is added to __sk_mem_schedule and it records limitations of memory for sockets and current usage. By using these tracepoints we're able to know detailed reason why kernel drop the packet. Signed-off-by: Satoru Moriya <satoru.moriya@hds.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/sock.c')
-rw-r--r--net/core/sock.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index 6e819780c232..76c403146750 100644
--- a/net/core/sock.c
+++ b/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 @@ suppress_allocation:
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);