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[Xen-devel] [PATCH] tapdisk:check O_DIRECT on hole file for performance
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-devel] [PATCH] tapdisk:check O_DIRECT on hole file for performance |
| 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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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>
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