5cd3a88d7f
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> |
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| staging.c | ||