RFR: 8263236: runtime/os/TestTracePageSizes.java fails on old kernels [v6]

[Aleksey Shipilev]

On Thu, 6 May 2021 18:38:26 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

> > > So the `hg` vmFlag is present for all kernels we care about?
> > 
> > 
> > Apparently. It is the test regexp that mismatches when kernel replies `??` for any other VMA flag.
> 
> Got that. Just wanted to make sure noone else had this problem because they were on an even older kernel where `ht` actually wasn't added.

The way I see the kernel sources, `ht` is available since the day `VmFlags` field [was introduced](https://github.com/torvalds/linux/commit/834f82e2aa9a8ede94b17b656329f850c1471514) in the smaps. Unless there is a bug that corrupts the VMA flag somewhere, we should be good.

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PR: https://git.openjdk.java.net/jdk/pull/3415