From: Ram Pai <linuxram@us.ibm.com>
To: Ralph Campbell <rcampbell@nvidia.com>
Cc: linux-mm@kvack.org, kvm-ppc@vger.kernel.org,
nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org,
Dan Williams <dan.j.williams@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
Matthew Wilcox <willy@infradead.org>,
Jerome Glisse <jglisse@redhat.com>,
John Hubbard <jhubbard@nvidia.com>,
Alistair Popple <apopple@nvidia.com>,
Christoph Hellwig <hch@lst.de>, Jason Gunthorpe <jgg@nvidia.com>,
Bharata B Rao <bharata@linux.ibm.com>, Zi Yan <ziy@nvidia.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Yang Shi <yang.shi@linux.alibaba.com>,
Paul Mackerras <paulus@ozlabs.org>,
Ben Skeggs <bskeggs@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC PATCH v3 2/2] mm: remove extra ZONE_DEVICE struct page refcount
Date: Wed, 7 Oct 2020 22:17:02 -0700 [thread overview]
Message-ID: <20201008051702.GA4773@ram-ibm-com.ibm.com> (raw)
In-Reply-To: <20201001181715.17416-3-rcampbell@nvidia.com>
On Thu, Oct 01, 2020 at 11:17:15AM -0700, Ralph Campbell wrote:
> ZONE_DEVICE struct pages have an extra reference count that complicates the
> code for put_page() and several places in the kernel that need to check the
> reference count to see that a page is not being used (gup, compaction,
> migration, etc.). Clean up the code so the reference count doesn't need to
> be treated specially for ZONE_DEVICE.
I was hoping this patch would resolve a page-reference issue that we run
into at random times while migrating a page to a device page backed by
secure-memory.
Unfortunately I continue to see the problem. There is a reference
held on that page, which fails the migration.
FYI
RP
next prev parent reply other threads:[~2020-10-08 5:17 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-01 18:17 [RFC PATCH v3 0/2] mm: remove extra ZONE_DEVICE struct page refcount Ralph Campbell
2020-10-01 18:17 ` [RFC PATCH v3 1/2] ext4/xfs: add page refcount helper Ralph Campbell
2020-10-02 5:56 ` Christoph Hellwig
2020-10-05 16:29 ` Ralph Campbell
2020-10-01 18:17 ` [RFC PATCH v3 2/2] mm: remove extra ZONE_DEVICE struct page refcount Ralph Campbell
2020-10-02 5:59 ` Christoph Hellwig
2020-10-05 16:40 ` Ralph Campbell
2020-10-08 5:17 ` Ram Pai [this message]
2020-10-08 16:45 ` Ralph Campbell
2020-10-05 16:56 ` [RFC PATCH v3 0/2] " Matthew Wilcox
2020-10-05 18:24 ` Dan Williams
2021-05-13 13:15 ` Matthew Wilcox
2021-05-13 17:35 ` Ralph Campbell
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