On Thu, Mar 19, 2020 at 8:19 PM Xiaoli Feng <[email protected]> wrote:
>
> Hi,
>
> ----- Original Message -----
> > From: "Dan Williams" <[email protected]>
> > To: "XiaoLi Feng" <[email protected]>
> > Cc: "linux-nvdimm" <[email protected]>
> > Sent: Friday, March 20, 2020 10:36:05 AM
> > Subject: Re: [PATCH v1] test/dax.sh: correct the pmd pagefault counts
> > generated by dax-pmd
> >
> > On Thu, Mar 19, 2020 at 7:13 PM XiaoLi Feng <[email protected]> wrote:
> > >
> > > From: Xiaoli Feng <[email protected]>
> > >
> > > For directIO, cannot generate pmd pagefault by pread|pwrite|read|write
> > > if do not map fd to memory. In dax-pmd.c, case 1 and case 4 each only
> > > generate once pmd pagefault. So change the all counts from 10 to 8.
> >
> > What kernel are you seeing this failure on? It's passing for me on v5.6-rc.
>
> I test on v4.18. I will test on v5.6.
>
The tests are not backwards compatible with older kernels. If the
current tests fail on an older kernel it means that older kernel is
missing a backport of features / fixes from upstream. In this case the
test was written as a regression test for kernel commit 6370740e5f8e
("fs/dax: Fix pmd vs pte conflict detection"). v4.18 precedes the
Xarray conversion of the filesystem-dax interface which incurred other
pmd behavior fixes so I'm not sure it will ever map correctly to that
baseline.
At a minimum I would say you would need to carry this change in the
distro package for ndctl that corresponds with that v4.18 kernel.
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