From: Naoya Horiguchi <naoya.horiguchi@linux.dev>
To: Mike Kravetz <mike.kravetz@oracle.com>
Cc: "HORIGUCHI NAOYA(堀口 直也)" <naoya.horiguchi@nec.com>,
"Greg KH" <gregkh@linuxfoundation.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
"Yang Shi" <shy828301@gmail.com>,
"James Houghton" <jthoughton@google.com>,
"Muchun Song" <songmuchun@bytedance.com>,
"Miaohe Lin" <linmiaohe@huawei.com>,
"Andrew Morton" <akpm@linux-foundation.org>
Subject: Re: hwpoison, shmem: fix data lost issue for 5.15.y
Date: Thu, 17 Nov 2022 08:58:42 +0900 [thread overview]
Message-ID: <20221116235842.GA62826@u2004> (raw)
In-Reply-To: <Y3RdmvpUq3XzYqq+@monkey>
On Tue, Nov 15, 2022 at 07:48:42PM -0800, Mike Kravetz wrote:
> On 11/15/22 15:39, Naoya Horiguchi wrote:
> > On Mon, Nov 14, 2022 at 05:30:29PM -0800, Mike Kravetz wrote:
> > > On 11/15/22 01:16, HORIGUCHI NAOYA(堀口 直也) wrote:
> > > > On Mon, Nov 14, 2022 at 02:53:51PM -0800, Mike Kravetz wrote:
> > > > > On 11/15/22 07:39, Naoya Horiguchi wrote:
> > > > > > On Mon, Nov 14, 2022 at 05:11:35PM +0100, Greg KH wrote:
> > > > > > > On Mon, Nov 14, 2022 at 10:14:03PM +0900, Naoya Horiguchi wrote:
> > > > > > > > Hi,
> > > > > > > >
> > > > > > > > I'd like to request the follow commits to be backported to 5.15.y.
> > > > > > > >
> > > > > > > > - dd0f230a0a80 ("mm: hwpoison: refactor refcount check handling")
> > > > > > > > - 4966455d9100 ("mm: hwpoison: handle non-anonymous THP correctly")
> > > > > > > > - a76054266661 ("mm: shmem: don't truncate page if memory failure happens")
> > > > > > > >
> > > > > > > > These patches fixed a data lost issue by preventing shmem pagecache from
> > > > > > > > being removed by memory error. These were not tagged for stable originally,
> > > > > > > > but that's revisited recently.
> > > > > > >
> > > > > > > And have you tested that these all apply properly (and in which order?)
> > > > > >
> > > > > > Yes, I've checked that these cleanly apply (without any change) on
> > > > > > 5.15.78 in the above order (i.e. dd0f23 is first, 496645 comes next,
> > > > > > then a76054).
> > > > > >
> > > > > > > and work correctly?
> > > > > >
> > > > > > Yes, I ran related testcases in my test suite, and their status changed
> > > > > > FAIL to PASS with these patches.
> > > > >
> > > > > Hi Naoya,
> > > > >
> > > > > Just curious if you have plans to do backports for earlier releases?
> > > >
> > > > I didn't have a clear plan. I just thought that we should backport to
> > > > earlier kernels if someone want and the patches are applicable easily
> > > > enough and well-tested.
> > > >
> > > > >
> > > > > If not, I can start that effort. We have seen data loss/corruption because of
> > > > > this on a 4.14 based release. So, I would go at least that far back.
> > > >
> > > > Thank you for raising hand, that's really helpful.
> > > >
> > > > Maybe dd0f230a0a80 ("[PATCH] hugetlbfs: don't delete error page from
> >
> > # I meant 8625147cafaa, sorry if the wrong commit ID confused you.
> >
> > I tested with 8625147cafaa too, and it made hugetlb-related testcases
> > passed.
> <snip>
> > We need to slightly modify 8625147cafaa to apply to 5.15.y. So in summary,
> > my updated suggestion for 5.15.y is like below:
> >
> > - [1/4] cherry-pick dd0f230a0a80 ("mm: hwpoison: refactor refcount check handling")
> > - [2/4] cherry-pick 4966455d9100 ("mm: hwpoison: handle non-anonymous THP correctly")
> > - [3/4] cherry-pick a76054266661 ("mm: shmem: don't truncate page if memory failure happens")
> > - [4/4] apply the following patch (as a modified version of 8625147cafaa)
>
> Hi Naoya,
>
> Just curious, do you have automated tests for this? I wanted test backports
> to each stable release. I could manually test, but that would be a bit
> involved and was hoping you had something automated.
Yes, related testcases are available on https://github.com/nhoriguchi/mm_regression.
You can run them by the following steps:
$ git clone https://github.com/nhoriguchi/mm_regression.
$ cd mm_regression
# Check that your testing server meets the prerequisite
# https://github.com/nhoriguchi/mm_regression#prerequisite
$ make
...
# Compiler might show errors but that's OK because all
# files are not needed to run relevant testcases.
$ bash run.sh prepare debug
# List the testcases in work/debug/recipelist like below:
$ cat work/debug/recipelist
mm/hwpoison/shmem_link/link-hard.auto3
mm/hwpoison/shmem_link/link-sym.auto3
mm/hwpoison/shmem_rw/thp-always.auto3
mm/hwpoison/shmem_rw/thp-never.auto3
$ bash run.sh project run
Thanks,
Naoya Horiguchi
next prev parent reply other threads:[~2022-11-16 23:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-14 13:14 hwpoison, shmem: fix data lost issue for 5.15.y Naoya Horiguchi
2022-11-14 16:11 ` Greg KH
2022-11-14 22:39 ` Naoya Horiguchi
2022-11-14 22:53 ` Mike Kravetz
2022-11-15 1:16 ` HORIGUCHI NAOYA(堀口 直也)
2022-11-15 1:30 ` Mike Kravetz
2022-11-15 6:39 ` Naoya Horiguchi
2022-11-16 3:48 ` Mike Kravetz
2022-11-16 23:58 ` Naoya Horiguchi [this message]
2022-11-23 1:05 ` Mike Kravetz
2022-11-23 18:54 ` Yang Shi
2022-11-24 3:03 ` Naoya Horiguchi
2022-11-16 9:16 ` Greg KH
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