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xprtrdma: Cache free MRs in each rpcrdma_req

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Instead of a globally-contended MR free list, cache MRs in each
rpcrdma_req as they are released. This means acquiring and releasing
an MR will be lock-free in the common case, even outside the
transport send lock.

The original idea of per-rpcrdma_req MR free lists was suggested by
Shirley Ma <shirley.ma@oracle.com> several years ago. I just now
figured out how to make that idea work with on-demand MR allocation.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever
2019-08-19 18:47:10 -04:00
committed by Anna Schumaker
parent 805a1f620b
commit 6dc6ec9e04
5 changed files with 69 additions and 14 deletions
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11
net/sunrpc/xprtrdma/rpc_rdma.c
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@@ -348,9 +348,14 @@ static struct rpcrdma_mr_seg *rpcrdma_mr_prepare(struct rpcrdma_xprt *r_xprt,
int nsegs, bool writing,
struct rpcrdma_mr **mr)
{
*mr = rpcrdma_mr_get(r_xprt);
if (!*mr)
goto out_getmr_err;
*mr = rpcrdma_mr_pop(&req->rl_free_mrs);
if (!*mr) {
*mr = rpcrdma_mr_get(r_xprt);
if (!*mr)
goto out_getmr_err;
trace_xprtrdma_mr_get(req);
(*mr)->mr_req = req;
}
rpcrdma_mr_push(*mr, &req->rl_registered);
return frwr_map(r_xprt, seg, nsegs, writing, req->rl_slot.rq_xid, *mr);