Proposal for adding O_DIRECT support into JDK 9

Brian Burkhalter brian.burkhalter at
Fri Sep 1 14:46:35 UTC 2017

Hi Lucy,

On Aug 31, 2017, at 3:49 PM, Lu, Yingqi < at> wrote:

> Here is the webrev.07 version of the patch:
> In this version, I have addressed the following issues:
> 2.      Added the filesystem type check on Solaris for DirectIOTest.
This check should be in all the tests as they all fail on Solaris. Perhaps the code could be put in a static method on DirectIOTest which could be called by all five tests?
> 3.      Checked if there is an equivalent system call like mincore in Windows to enable DirectIOTest for Windows. I could not find anything unfortunately.

OK I do not think that is a big deal as this is not the target area anyway.

> Issues that are still open:
> 1.      How should we address the issue of AIX OS does not support setting O_DIRECT after the open()

It would be good to hear others comments as well on this.

> Please take a look at this version and let us know your feedback. I would also like to learn what will be a proper approach to solve the AIX issue and what kind of details we need to provide for the exception messages. I will try to incorporate all of those changes into the next version.
I’ll try to get back to you on these points today.


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