From: Andrew Morton <akpm@linux-foundation.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
linux-kernel@vger.kernel.org, Michal Hocko <mhocko@kernel.org>,
linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH V7 0/4] mm/kvm/vfio/ppc64: Migrate compound pages out of CMA region
Date: Tue, 29 Jan 2019 14:56:52 -0800 [thread overview]
Message-ID: <20190129145652.c4021a4adf8416618211c38d@linux-foundation.org> (raw)
In-Reply-To: <20190114095438.32470-1-aneesh.kumar@linux.ibm.com>
On Mon, 14 Jan 2019 15:24:32 +0530 "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> wrote:
> ppc64 use CMA area for the allocation of guest page table (hash page table). We won't
> be able to start guest if we fail to allocate hash page table. We have observed
> hash table allocation failure because we failed to migrate pages out of CMA region
> because they were pinned. This happen when we are using VFIO. VFIO on ppc64 pins
> the entire guest RAM. If the guest RAM pages get allocated out of CMA region, we
> won't be able to migrate those pages. The pages are also pinned for the lifetime of the
> guest.
>
> Currently we support migration of non-compound pages. With THP and with the addition of
> hugetlb migration we can end up allocating compound pages from CMA region. This
> patch series add support for migrating compound pages.
Very little review activity is in evidence. Please identify some
appropriate reviewers and ask them to take a look?
next prev parent reply other threads:[~2019-01-29 22:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-14 9:54 [PATCH V7 0/4] mm/kvm/vfio/ppc64: Migrate compound pages out of CMA region Aneesh Kumar K.V
2019-01-14 9:54 ` [PATCH V7 1/4] mm/cma: Add PF flag to force non cma alloc Aneesh Kumar K.V
2019-01-29 22:52 ` Andrew Morton
2019-01-14 9:54 ` [PATCH V7 2/4] mm: Update get_user_pages_longterm to migrate pages allocated from CMA region Aneesh Kumar K.V
2019-01-14 9:54 ` Aneesh Kumar K.V
2019-01-14 9:54 ` [PATCH V7 3/4] powerpc/mm/iommu: Allow migration of cma allocated pages during mm_iommu_do_alloc Aneesh Kumar K.V
2019-01-30 11:34 ` Michael Ellerman
2019-01-31 4:42 ` Aneesh Kumar K.V
2019-01-14 9:54 ` [PATCH V7 4/4] powerpc/mm/iommu: Allow large IOMMU page size only for hugetlb backing Aneesh Kumar K.V
2019-01-14 9:54 ` [PATCH V7 5/5] testing Aneesh Kumar K.V
2019-01-15 11:25 ` Aneesh Kumar K.V
2019-01-29 22:56 ` Andrew Morton [this message]
2019-02-26 23:53 ` [PATCH V7 0/4] mm/kvm/vfio/ppc64: Migrate compound pages out of CMA region Andrew Morton
2019-02-27 8:52 ` Aneesh Kumar K.V
2019-02-27 11:29 ` Michael Ellerman
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