linux-kernel - Re: [PATCH v3 00/15] HWPOISON: soft offline rework

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Date:   Wed, 1 Jul 2020 09:07:15 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     Oscar Salvador <osalvador@...e.de>
CC:     Qian Cai <cai@....pw>,
        "nao.horiguchi@...il.com" <nao.horiguchi@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mike.kravetz@...cle.com" <mike.kravetz@...cle.com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "david@...hat.com" <david@...hat.com>,
        "aneesh.kumar@...ux.vnet.ibm.com" <aneesh.kumar@...ux.vnet.ibm.com>,
        "zeil@...dex-team.ru" <zeil@...dex-team.ru>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 00/15] HWPOISON: soft offline rework

On Wed, Jul 01, 2020 at 10:22:07AM +0200, Oscar Salvador wrote:
> On Tue, 2020-06-30 at 08:35 +0200, Oscar Salvador wrote:
> > > Even after applied the compling fix,
> > > 
> > > https://lore.kernel.org/linux-mm/20200628065409.GA546944@u2004/
> > > 
> > > madvise(MADV_SOFT_OFFLINE) will fail with EIO with hugetlb where it
> > > would succeed without this series. Steps:
> > > 
> > > # git clone https://github.com/cailca/linux-mm
> > > # cd linux-mm; make
> > > # ./random 1 (Need at least two NUMA memory nodes)
> > >  start: migrate_huge_offline
> > > - use NUMA nodes 0,4.
> > > - mmap and free 8388608 bytes hugepages on node 0
> > > - mmap and free 8388608 bytes hugepages on node 4
> > > madvise: Input/output error
> > 
> > I think I know why.
> > It's been a while since I took a look, but I compared the posted
> > patchset with my newest patchset I had ready and I saw I made some
> > changes with regard of hugetlb pages.
> > 
> > I will be taking a look, although it might be better to re-post the
> > patchset instead of adding a fix on top since the changes are a bit
> > substantial.
> 
> Yap, I just confirmed this.

I've reproduced the EIO, but still not sure how this happens ...

> Posted version had some flaws wrt. hugetlb pages, that is why I was
> working on a v3.
> I am rebasing my v3 on top of the mm with the posted patchset reverted.

OK, thank you for offering to work for v4, so I'll wait for it for testing.

Thanks,
Naoya Horiguchi