xprtrdma: Use an llist to manage free rpcrdma_reps

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rpcrdma_rep objects are removed from their free list by only a
single thread: the Receive completion handler. Thus that free list
can be converted to an llist, where a single-threaded consumer and
a multi-threaded producer (rpcrdma_buffer_put) can both access the
llist without the need for any serialization.

This eliminates spin lock contention between the Receive completion
handler and rpcrdma_buffer_get, and makes the rep consumer wait-
free.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

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Chuck Lever 2019-08-19 18:48:43 -04:00 • committed by Anna Schumaker

parent 4d6b8890dd

commit b0b227f071

2 changed files with 53 additions and 59 deletions

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106

net/sunrpc/xprtrdma/verbs.c

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6

net/sunrpc/xprtrdma/xprt_rdma.h

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