staging/rdma/hfi1: convert buffers allocated atomic to per cpu

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Profiling has shown the the atomic is a performance issue
for the pio hot path.

If multiple cpus allocated an sc's buffer, the cacheline
containing the atomic will bounce from L0 to L0.

Convert the atomic to a percpu variable.

Reviewed-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Mike Marciniszyn 2015-12-07 15:39:22 -05:00 • committed by Greg Kroah-Hartman

parent a5a9e8ccab

commit a054374f15

3 changed files with 40 additions and 8 deletions

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40

drivers/staging/rdma/hfi1/pio.c

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2

drivers/staging/rdma/hfi1/pio.h

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6

drivers/staging/rdma/hfi1/pio_copy.c

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