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svcrdma: Convert rdma_stat_recv to a per-CPU counter

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Receives are frequent events. Avoid the overhead of a memory bus
lock cycle for counting a value that is hardly every used.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2020-12-29 15:47:44 -05:00
parent 59a00257c6
commit df971cd853
3 changed files with 54 additions and 7 deletions
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3
include/linux/sunrpc/svc_rdma.h
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@@ -49,6 +49,7 @@
#include <linux/sunrpc/rpc_rdma_cid.h>
#include <linux/sunrpc/svc_rdma_pcl.h>
#include <linux/percpu_counter.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
@@ -65,7 +66,7 @@ extern unsigned int svcrdma_max_requests;
extern unsigned int svcrdma_max_bc_requests;
extern unsigned int svcrdma_max_req_size;
extern atomic_t rdma_stat_recv;
extern struct percpu_counter svcrdma_stat_recv;
extern atomic_t rdma_stat_read;
extern atomic_t rdma_stat_write;
extern atomic_t rdma_stat_sq_starve;