Google Engineer Reworks Direct I/O In Linux Kernel

Posted by tracyanne on Feb 14, 2013 3:26 PM EDT
Phoronix; By Michael Larabel
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On Monday was the original "work in progress" patch to improve the DIO code in the Linux kernel. As Overstreet wrote then, "The end result is _vastly_ simpler - direct-io.c is now ~700 lines, vs. ~1300 previously. dio_submit is almost gone, I'm down to 4 things left in it. It relies heavily on my block layer patches for efficient bio splitting, and making generic_make_request() take arbitrary size bios...It also gets rid of the various differences between async and sync requests - previously, for async reads it marked pages dirty before submitting the io (in process context), then on completion punts to worqueue to redirty the pages if any need to be. This now happens for sync reads, too."

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