[Xen-devel] [PATCH] tapdisk:check O_DIRECT on hole file for performance

[Wei Kong <weikong.cn@xxxxxxxxx>]

Although tapdisk has been instead of tapdisk-ioemu, but it still used on some old xen-3.2.
So fix a performance problem here.
--

Kernel aio will retry when encounter a block doesn't allocated, then do async io,



but O_DIRECT flag was there, so io_wait on sync data.
And clean a little code style.

Signed-off-by: Wei Kong <weikong.cn@gmail.com>

Attachment: tapdisk_check_O_DIRECT_on_hole_file.patch
Description: Text Data

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