Avi Kivity wrote:
And video streaming on some embedded devices with no MMU! (Due to the
page cache heuristics working poorly with no MMU, sustained reliable
streaming is managed with O_DIRECT and the app managing cache itself
(like a database), and that needs AIO to keep the request queue busy.
At least, that's the theory.)
Could use threads as well, no?
Perhaps. This raises another point about AIO vs. threads:
If I submit sequential O_DIRECT reads with aio_read(), will they enter
the device read queue in the same order, and reach the disk in that
order (allowing for reordering when worthwhile by the elevator)?