From: Dave Hansen <dave.hansen@intel.com>
To: Anshuman Khandual <khandual@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: mhocko@suse.com, js1304@gmail.com, vbabka@suse.cz,
mgorman@suse.de, minchan@kernel.org, akpm@linux-foundation.org,
aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com
Subject: Re: [RFC 5/8] mm: Add new flag VM_CDM for coherent device memory
Date: Mon, 24 Oct 2016 11:00:32 -0700 [thread overview]
Message-ID: <580E4C40.50107@intel.com> (raw)
In-Reply-To: <580E4704.1040104@intel.com>
On 10/24/2016 10:38 AM, Dave Hansen wrote:
> On 10/23/2016 09:31 PM, Anshuman Khandual wrote:
>> > VMAs containing coherent device memory should be marked with VM_CDM. These
>> > VMAs need to be identified in various core kernel paths and this new flag
>> > will help in this regard.
> ... and it's sticky? So if a VMA *ever* has one of these funky pages in
> it, it's stuck being VM_CDM forever? Never to be merged with other
> VMAs? Never to see the light of autonuma ever again?
Urg, this is even worse than I suspected.
Does this handle shared pages (like the page cache mode you call out as
a requirement) where the "cdm" page is faulted into one process VMA, but
it was allocated against another?
Can't that give you a "cdm" page mapped into a non-VM_CDM VMA? Or, a
VM_CDM VMA with no "cdm" pages in it?
next prev parent reply other threads:[~2016-10-24 18:03 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-24 4:31 [RFC 0/8] Define coherent device memory node Anshuman Khandual
2016-10-24 4:31 ` [RFC 1/8] mm: " Anshuman Khandual
2016-10-24 17:09 ` Dave Hansen
2016-10-25 1:22 ` Anshuman Khandual
2016-10-25 15:47 ` Dave Hansen
2016-10-24 4:31 ` [RFC 2/8] mm: Add specialized fallback zonelist for coherent device memory nodes Anshuman Khandual
2016-10-24 17:10 ` Dave Hansen
2016-10-25 1:27 ` Anshuman Khandual
2016-11-17 7:40 ` Anshuman Khandual
2016-11-17 7:59 ` [DRAFT 1/2] mm/cpuset: Exclude CDM nodes from each task's mems_allowed node mask Anshuman Khandual
2016-11-17 7:59 ` [DRAFT 2/2] mm/hugetlb: Restrict HugeTLB allocations only to the system RAM nodes Anshuman Khandual
2016-11-17 8:28 ` [DRAFT 1/2] mm/cpuset: Exclude CDM nodes from each task's mems_allowed node mask kbuild test robot
2016-10-24 4:31 ` [RFC 3/8] mm: Isolate coherent device memory nodes from HugeTLB allocation paths Anshuman Khandual
2016-10-24 17:16 ` Dave Hansen
2016-10-25 4:15 ` Aneesh Kumar K.V
2016-10-25 7:17 ` Balbir Singh
2016-10-25 7:25 ` Balbir Singh
2016-10-24 4:31 ` [RFC 4/8] mm: Accommodate coherent device memory nodes in MPOL_BIND implementation Anshuman Khandual
2016-10-24 4:31 ` [RFC 5/8] mm: Add new flag VM_CDM for coherent device memory Anshuman Khandual
2016-10-24 17:38 ` Dave Hansen
2016-10-24 18:00 ` Dave Hansen [this message]
2016-10-25 12:36 ` Balbir Singh
2016-10-25 19:20 ` Aneesh Kumar K.V
2016-10-25 20:01 ` Dave Hansen
2016-10-24 4:31 ` [RFC 6/8] mm: Make VM_CDM marked VMAs non migratable Anshuman Khandual
2016-10-24 4:31 ` [RFC 7/8] mm: Add a new migration function migrate_virtual_range() Anshuman Khandual
2016-10-24 4:31 ` [RFC 8/8] mm: Add N_COHERENT_DEVICE node type into node_states[] Anshuman Khandual
2016-10-25 7:22 ` Balbir Singh
2016-10-26 4:52 ` Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 00/10] Test and debug patches for coherent device memory Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 01/10] dt-bindings: Add doc for ibm,hotplug-aperture Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 02/10] powerpc/mm: Create numa nodes for hotplug memory Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 03/10] powerpc/mm: Allow memory hotplug into a memory less node Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 04/10] mm: Enable CONFIG_MOVABLE_NODE on powerpc Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 05/10] powerpc/mm: Identify isolation seeking coherent memory nodes during boot Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 06/10] mm: Export definition of 'zone_names' array through mmzone.h Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 07/10] mm: Add debugfs interface to dump each node's zonelist information Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 08/10] powerpc: Enable CONFIG_MOVABLE_NODE for PPC64 platform Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 09/10] drivers: Add two drivers for coherent device memory tests Anshuman Khandual
2016-10-24 4:42 ` [DEBUG 10/10] test: Add a script to perform random VMA migrations across nodes Anshuman Khandual
2016-10-24 17:09 ` [RFC 0/8] Define coherent device memory node Jerome Glisse
2016-10-25 4:26 ` Aneesh Kumar K.V
2016-10-25 15:16 ` Jerome Glisse
2016-10-26 11:09 ` Aneesh Kumar K.V
2016-10-26 16:07 ` Jerome Glisse
2016-10-28 5:29 ` Aneesh Kumar K.V
2016-10-28 16:16 ` Jerome Glisse
2016-11-05 5:21 ` Anshuman Khandual
2016-11-05 18:02 ` Jerome Glisse
2016-10-25 4:59 ` Aneesh Kumar K.V
2016-10-25 15:32 ` Jerome Glisse
2016-10-25 17:31 ` Aneesh Kumar K.V
2016-10-25 18:52 ` Jerome Glisse
2016-10-26 11:13 ` Anshuman Khandual
2016-10-26 16:02 ` Jerome Glisse
2016-10-27 4:38 ` Anshuman Khandual
2016-10-27 7:03 ` Anshuman Khandual
2016-10-27 15:05 ` Jerome Glisse
2016-10-28 5:47 ` Anshuman Khandual
2016-10-28 16:08 ` Jerome Glisse
2016-10-26 12:56 ` Anshuman Khandual
2016-10-26 16:28 ` Jerome Glisse
2016-10-27 10:23 ` Balbir Singh
2016-10-25 12:07 ` Balbir Singh
2016-10-25 15:21 ` Jerome Glisse
2016-10-24 18:04 ` Dave Hansen
2016-10-24 18:32 ` David Nellans
2016-10-24 19:36 ` Dave Hansen
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