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Commit fe3475af authored by Zhu Yanjun's avatar Zhu Yanjun Committed by David S. Miller
Browse files

net: rds: add per rds connection cache statistics 



The variable cache_allocs is to indicate how many frags (KiB) are in one
rds connection frag cache.
The command "rds-info -Iv" will output the rds connection cache
statistics as below:
"
RDS IB Connections:
      LocalAddr RemoteAddr Tos SL  LocalDev            RemoteDev
      1.1.1.14 1.1.1.14   58 255  fe80::2:c903:a:7a31 fe80::2:c903:a:7a31
      send_wr=256, recv_wr=1024, send_sge=8, rdma_mr_max=4096,
      rdma_mr_size=257, cache_allocs=12
"
This means that there are about 12KiB frag in this rds connection frag
cache.
Since rds.h in rds-tools is not related with the kernel rds.h, the change
in kernel rds.h does not affect rds-tools.
rds-info in rds-tools 2.0.5 and 2.0.6 is tested with this commit. It works
well.

Signed-off-by: default avatarZhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent dceebd4c

include/uapi/linux/rds.h

+2 −0
Original line number Diff line number Diff line
@@ -250,6 +250,7 @@ struct rds_info_rdma_connection { 
	__u32		rdma_mr_max;

	__u32		rdma_mr_size;

	__u8		tos;

	__u32		cache_allocs;

};



struct rds6_info_rdma_connection {
@@ -264,6 +265,7 @@ struct rds6_info_rdma_connection { 
	__u32		rdma_mr_max;

	__u32		rdma_mr_size;

	__u8		tos;

	__u32		cache_allocs;

};



/* RDS message Receive Path Latency points */

net/rds/ib.c

+2 −0
Original line number Diff line number Diff line
@@ -318,6 +318,7 @@ static int rds_ib_conn_info_visitor(struct rds_connection *conn, 
		iinfo->max_recv_wr = ic->i_recv_ring.w_nr;

		iinfo->max_send_sge = rds_ibdev->max_sge;

		rds_ib_get_mr_info(rds_ibdev, iinfo);

		iinfo->cache_allocs = atomic_read(&ic->i_cache_allocs);

	}

	return 1;

}
@@ -351,6 +352,7 @@ static int rds6_ib_conn_info_visitor(struct rds_connection *conn, 
		iinfo6->max_recv_wr = ic->i_recv_ring.w_nr;

		iinfo6->max_send_sge = rds_ibdev->max_sge;

		rds6_ib_get_mr_info(rds_ibdev, iinfo6);

		iinfo6->cache_allocs = atomic_read(&ic->i_cache_allocs);

	}

	return 1;

}