[GitHub] [incubator-brpc] lpstudy opened a new issue #993: Does IOPortal consider to support create memory aligned block for direct IO

[GitBox <gi...@apache.org>]

lpstudy opened a new issue #993: Does IOPortal consider to support create memory aligned block for direct IO
URL: https://github.com/apache/incubator-brpc/issues/993
 
 
   1. IOPortal calls `pappend_from_file_descriptor` to read data from a opened `fd`, where in my condition `fd` is opened with `O_DIRECT` flag, but the function failed with Invalid arguments. I am sure that the offset and size are chunk-aligned,  so I guess this is because the memory buffer is not chunk-aligned. 
   2. I read the iobuf.cpp, it call blockmem_allocate (default is ::malloc) to alloc memory for `create_block`, which is not memory-aligned for direct io operations.  This may be the reason for invalid argument.
   3. Do we have plan for memory-aligned block allocation or in deed is there a way to achieve this goal. I want to minimize the data copy as fewer as possible.

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