IB/core: dma map/unmap locking optimizations

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Currently, while mapping or unmapping pages for ODP, the umem mutex is locked
and unlocked once for each page. Such lock/unlock operation take few tens to
hundreds of nsecs. This makes a significant impact when mapping or unmapping few
MBs of memory.

To avoid this, the mutex should be locked only once per operation, and not per
page.

Signed-off-by: Guy Shapiro <guysh@mellanox.com>
Acked-by: Shachar Raindel <raindel@mellanox.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

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Guy Shapiro 2015-04-15 18:17:56 +03:00 • committed by Doug Ledford

parent 5b6b8fe640

commit c1d383b578

1 changed files with 4 additions and 5 deletions

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9

drivers/infiniband/core/umem_odp.c

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