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| author | Chuck Lever <chuck.lever@oracle.com> | 2016-11-29 11:04:58 -0500 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2016-11-30 17:31:13 -0500 |
| commit | dd6fd213b05e7a1f590b470500343dd97c3a32c1 (patch) | |
| tree | d622a047d2990e6ef4da4b9665fb01805edb17cd /include/linux/sunrpc | |
| parent | e4eb42cecc6dc546aac888ee4913d59121e886ee (diff) | |
| download | lwn-dd6fd213b05e7a1f590b470500343dd97c3a32c1.tar.gz lwn-dd6fd213b05e7a1f590b470500343dd97c3a32c1.zip | |
svcrdma: Remove DMA map accounting
Clean up: sc_dma_used is not required for correct operation. It is
simply a debugging tool to report when svcrdma has leaked DMA maps.
However, manipulating an atomic has a measurable CPU cost, and DMA
map accounting specific to svcrdma will be meaningless once svcrdma
is converted to use the new generic r/w API.
A similar kind of debug accounting can be done simply by enabling
the IOMMU or by using CONFIG_DMA_API_DEBUG, CONFIG_IOMMU_DEBUG, and
CONFIG_IOMMU_LEAK.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'include/linux/sunrpc')
| -rw-r--r-- | include/linux/sunrpc/svc_rdma.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h index 601cb07aa746..43d7c709d117 100644 --- a/include/linux/sunrpc/svc_rdma.h +++ b/include/linux/sunrpc/svc_rdma.h @@ -148,7 +148,6 @@ struct svcxprt_rdma { struct ib_pd *sc_pd; - atomic_t sc_dma_used; spinlock_t sc_ctxt_lock; struct list_head sc_ctxts; int sc_ctxt_used; @@ -200,7 +199,6 @@ static inline void svc_rdma_count_mappings(struct svcxprt_rdma *rdma, struct svc_rdma_op_ctxt *ctxt) { ctxt->mapped_sges++; - atomic_inc(&rdma->sc_dma_used); } /* svc_rdma_backchannel.c */ |