[RFC PATCH 0/5] nvme: reduce repetitive calls in fast path

[Chaitanya Kulkarni]

Hi Christoph/James/Keith/Sagi,

While reviewing other patch-series I found that there are repetitive
calls to blk_rq_nr_phys_segments() in the fast path for NVMe Transports 
(pci, rdma, fc, loop). We should try and avoid as many repetitive checks
in the fast-path as possible.

This patch-series reduces multiple calls and minimizes the repetitive
checks in blk_rq_nr_phys_segments() for NVMe transports.

P.S. Tagging it as an RFC since I've not tested rdma/tcp/fc part, if we
agree to get this in I'll put more effort in testing.

Regards,
Chaitanya

Chaitanya Kulkarni (5):
  nvme-pci: reduce blk_rq_nr_phys_segments calls
  nvme-rdma: reduce blk_rq_nr_phys_segments calls
  nvme-tcp: reduce blk_rq_nr_phys_segments calls
  nvme-fc: reduce blk_rq_nr_phys_segments calls
  nvme-loop: reduce blk_rq_nr_phys_segments calls

 drivers/nvme/host/fc.c     | 20 ++++++++++----------
 drivers/nvme/host/pci.c    | 18 ++++++++++--------
 drivers/nvme/host/rdma.c   |  8 ++++----
 drivers/nvme/host/tcp.c    | 10 +++++-----
 drivers/nvme/target/loop.c |  6 +++---
 5 files changed, 32 insertions(+), 30 deletions(-)

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2.22.0