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author | Mitko Haralanov <mitko.haralanov@intel.com> | 2016-03-08 11:15:22 -0800 |
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committer | Doug Ledford <dledford@redhat.com> | 2016-03-21 15:55:24 -0400 |
commit | 5cd3a88d7f2b050164dc1df59a398294515126d9 (patch) | |
tree | d6d1175f3a20b9b49a6b99ec77123a6c8f9575a0 /drivers/staging/speakup | |
parent | IB/hfi1: Adjust last address values for intervals (diff) | |
download | linux-dev-5cd3a88d7f2b050164dc1df59a398294515126d9.tar.xz linux-dev-5cd3a88d7f2b050164dc1df59a398294515126d9.zip |
IB/hfi1: Implement SDMA-side buffer caching
Add support for caching of user buffers used for SDMA
transfers. This change improves performance by
avoiding repeatedly pinning the pages of buffers, which
are being re-used by the application.
While the cost of the pinning operation has been made
heavier by adding the extra code to search the cache tree,
re-allocate pages arrays, and future cache evictions,
that cost will be amortized against the savings when the
same buffer is re-used. It is also worth noting that in
most cases, the cost of pinning should be much lower due
to the buffer already being in the cache.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/staging/speakup')
0 files changed, 0 insertions, 0 deletions