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svcrdma: Convert rdma_stat_sq_starve to a per-CPU counter

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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 15:55:17 -05:00
parent df971cd853
commit 22df5a2246
4 changed files with 12 additions and 6 deletions
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1
net/sunrpc/xprtrdma/svc_rdma_rw.c
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@@ -364,6 +364,7 @@ static int svc_rdma_post_chunk_ctxt(struct svc_rdma_chunk_ctxt *cc)
return 0;
}
percpu_counter_inc(&svcrdma_stat_sq_starve);
trace_svcrdma_sq_full(rdma);
atomic_add(cc->cc_sqecount, &rdma->sc_sq_avail);
wait_event(rdma->sc_send_wait,