linux-kernel - Re: [PATCH 04/25] mm: remove MEMORY_DEVICE

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Date:   Wed, 26 Jun 2019 11:49:53 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Christoph Hellwig <hch@....de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>, Linux MM <linux-mm@...ck.org>,
        nouveau@...ts.freedesktop.org,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        linux-pci@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 04/25] mm: remove MEMORY_DEVICE_PUBLIC support

On Wed, Jun 26, 2019 at 10:14:45AM -0700, 'Ira Weiny' wrote:
> On Wed, Jun 26, 2019 at 09:00:47AM -0700, Dan Williams wrote:
> > [ add Ira ]
> > 
> > On Wed, Jun 26, 2019 at 5:27 AM Christoph Hellwig <hch@....de> wrote:
> > >
> > > The code hasn't been used since it was added to the tree, and doesn't
> > > appear to actually be usable.
> > >
> > > Signed-off-by: Christoph Hellwig <hch@....de>
> > > Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>
> > > Acked-by: Michal Hocko <mhocko@...e.com>
> > [..]
> > > diff --git a/mm/swap.c b/mm/swap.c
> > > index 7ede3eddc12a..83107410d29f 100644
> > > --- a/mm/swap.c
> > > +++ b/mm/swap.c
> > > @@ -740,17 +740,6 @@ void release_pages(struct page **pages, int nr)
> > >                 if (is_huge_zero_page(page))
> > >                         continue;
> > >
> > > -               /* Device public page can not be huge page */
> > > -               if (is_device_public_page(page)) {
> > > -                       if (locked_pgdat) {
> > > -                               spin_unlock_irqrestore(&locked_pgdat->lru_lock,
> > > -                                                      flags);
> > > -                               locked_pgdat = NULL;
> > > -                       }
> > > -                       put_devmap_managed_page(page);
> > > -                       continue;
> > > -               }
> > > -
> > 
> > This collides with Ira's bug fix [1]. The MEMORY_DEVICE_FSDAX case
> > needs this to be converted to be independent of "public" pages.
> > Perhaps it should be pulled out of -mm and incorporated in this
> > series.
> > 
> > [1]: https://lore.kernel.org/lkml/20190605214922.17684-1-ira.weiny@intel.com/
> 
> Agreed and Andrew picked the first 2 versions of it, mmotm commits:
> 
> 3eed114b5b6b mm-swap-fix-release_pages-when-releasing-devmap-pages-v2
> 9b7d8d0f572f mm/swap.c: fix release_pages() when releasing devmap pages
> 
> I don't see v3 but there were no objections...

Ok somehow I can't fetch mmotm right now...

Dan had and updated mmotm tree and it does have my v4 patch.

Does anyone else have issues with git://git.cmpxchg.org/linux-mmotm.git or is
it just me?  FWIW I have checked proxies etc... and can get to linus and other
sites just fine, so it looks like an issue there.  Although the web page is
fine...

Sorry,
Ira