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[Xen-devel] [PATCH] tapdisk:check O_DIRECT on hole file for performance
- To: xen-devel@xxxxxxxxxxxxxxxxxxx
- From: Wei Kong <weikong.cn@xxxxxxxxx>
- Date: Tue, 18 Aug 2009 10:42:42 +0800
- Delivery-date: Mon, 17 Aug 2009 19:43:45 -0700
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- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
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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