[net-next][PATCH v3 15/17] RDS: add stat for socket recv memory usage

[Santosh Shilimkar]

From: Venkat Venkatsubra <venkat.x.venkatsu...@oracle.com>

Tracks the receive side memory added to scokets and removed from sockets.

Signed-off-by: Venkat Venkatsubra <venkat.x.venkatsu...@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilim...@oracle.com>
---
 net/rds/rds.h  | 3 +++
 net/rds/recv.c | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/net/rds/rds.h b/net/rds/rds.h
index 0bb8213..8ccd5a9 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -631,6 +631,9 @@ struct rds_statistics {
        uint64_t        s_cong_update_received;
        uint64_t        s_cong_send_error;
        uint64_t        s_cong_send_blocked;
+       uint64_t        s_recv_bytes_added_to_socket;
+       uint64_t        s_recv_bytes_removed_from_socket;
+
 };
 
 /* af_rds.c */
diff --git a/net/rds/recv.c b/net/rds/recv.c
index 9d0666e..ba19eee 100644
--- a/net/rds/recv.c
+++ b/net/rds/recv.c
@@ -94,6 +94,10 @@ static void rds_recv_rcvbuf_delta(struct rds_sock *rs, 
struct sock *sk,
                return;
 
        rs->rs_rcv_bytes += delta;
+       if (delta > 0)
+               rds_stats_add(s_recv_bytes_added_to_socket, delta);
+       else
+               rds_stats_add(s_recv_bytes_removed_from_socket, -delta);
        now_congested = rs->rs_rcv_bytes > rds_sk_rcvbuf(rs);
 
        rdsdebug("rs %p (%pI4:%u) recv bytes %d buf %d "
-- 
1.9.1