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From: Dan Williams <dan.j.williams@intel.com>
To: Xiaoli Feng <xifeng@redhat.com>
Cc: linux-nvdimm <linux-nvdimm@lists.01.org>
Subject: Re: [PATCH v1] test/dax.sh: correct the pmd pagefault counts generated by dax-pmd
Date: Thu, 19 Mar 2020 20:37:07 -0700	[thread overview]
Message-ID: <CAPcyv4hd_N0Hef8EysL2obYiZQA9ka_=iUt+NTjaQJVbzcME6Q@mail.gmail.com> (raw)
In-Reply-To: <1404245216.17517222.1584674311320.JavaMail.zimbra@redhat.com>

On Thu, Mar 19, 2020 at 8:19 PM Xiaoli Feng <xifeng@redhat.com> wrote:
>
> Hi,
>
> ----- Original Message -----
> > From: "Dan Williams" <dan.j.williams@intel.com>
> > To: "XiaoLi Feng" <xifeng@redhat.com>
> > Cc: "linux-nvdimm" <linux-nvdimm@lists.01.org>
> > 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 <xifeng@redhat.com> wrote:
> > >
> > > From: Xiaoli Feng <xifeng@redhat.com>
> > >
> > > 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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  reply	other threads:[~2020-03-20  3:37 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-20  2:12 XiaoLi Feng
2020-03-20  2:36 ` Dan Williams
2020-03-20  3:18   ` Xiaoli Feng
2020-03-20  3:37     ` Dan Williams [this message]
2020-03-20  5:16       ` Xiaoli Feng

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