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Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is freed

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On Mon, Nov 21, 2016 at 12:49:55PM +1100, Balbir Singh wrote:
> On 19/11/16 05:18, Jérôme Glisse wrote:
> > When a ZONE_DEVICE page refcount reach 1 it means it is free and nobody
> > is holding a reference on it (only device to which the memory belong do).
> > Add a callback and call it when that happen so device driver can implement
> > their own free page management.
> > 
> 
> Could you give an example of what their own free page management might look like?

Well hard to do that, the free management is whatever the device driver want to do.
So i don't have any example to give. Each device driver (especialy GPU ones) have
their own memory management with little commonality.

So how the device driver manage that memory is really not important, at least it is
not something for which i want to impose a policy onto driver. I want to leave each
device driver decide on how to achieve that.

Cheers,
Jérôme

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[HMM v13 00/18] HMM (Heterogeneous Memory Management) v13 Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:20 +0100
  [HMM v13 13/18] mm/hmm/mirror: device page fault handler Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:20 +0100
  [HMM v13 12/18] mm/hmm/mirror: helper to snapshot CPU page table Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
  [HMM v13 02/18] mm/ZONE_DEVICE/unaddressable: add support for un-addressable device memory Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
    Re: [HMM v13 02/18] mm/ZONE_DEVICE/unaddressable: add support for  un-addressable device memory Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-21 09:10 +0100
      Re: [HMM v13 02/18] mm/ZONE_DEVICE/unaddressable: add support for  un-addressable device memory Jerome Glisse <jglisse@redhat.com> - 2016-11-21 13:40 +0100
        Re: [HMM v13 02/18] mm/ZONE_DEVICE/unaddressable: add support for  un-addressable device memory Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-22 06:20 +0100
  [HMM v13 09/18] mm/hmm/mirror: mirror process address space on device with HMM helpers Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
    Re: [HMM v13 09/18] mm/hmm/mirror: mirror process address space on  device with HMM helpers Balbir Singh <bsingharora@gmail.com> - 2016-11-21 03:50 +0100
      Re: [HMM v13 09/18] mm/hmm/mirror: mirror process address space on  device with HMM helpers Jerome Glisse <jglisse@redhat.com> - 2016-11-21 06:20 +0100
  [HMM v13 05/18] mm/ZONE_DEVICE/devmem_pages_remove: allow early removal of device memory Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
    Re: [HMM v13 05/18] mm/ZONE_DEVICE/devmem_pages_remove: allow early  removal of device memory Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-21 11:40 +0100
      Re: [HMM v13 05/18] mm/ZONE_DEVICE/devmem_pages_remove: allow early  removal of device memory Jerome Glisse <jglisse@redhat.com> - 2016-11-21 13:40 +0100
        Re: [HMM v13 05/18] mm/ZONE_DEVICE/devmem_pages_remove: allow early  removal of device memory Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-22 06:00 +0100
  [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is freed Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
    Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is  freed Balbir Singh <bsingharora@gmail.com> - 2016-11-21 03:00 +0100
      Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is  freed Jerome Glisse <jglisse@redhat.com> - 2016-11-21 06:00 +0100
    Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is  freed Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-21 09:30 +0100
      Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is  freed Jerome Glisse <jglisse@redhat.com> - 2016-11-21 13:40 +0100
        Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is  freed Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-22 06:10 +0100
  [HMM v13 10/18] mm/hmm/mirror: add range lock helper, prevent CPU page table update for the range Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
  [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap for unaddressable Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
    Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Balbir Singh <bsingharora@gmail.com> - 2016-11-21 03:10 +0100
      Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Jerome Glisse <jglisse@redhat.com> - 2016-11-21 06:10 +0100
        Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Balbir Singh <bsingharora@gmail.com> - 2016-11-22 03:30 +0100
          Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Jerome Glisse <jglisse@redhat.com> - 2016-11-22 15:00 +0100
      Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-21 12:20 +0100
    Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-21 12:00 +0100
      Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Jerome Glisse <jglisse@redhat.com> - 2016-11-21 13:50 +0100
        Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-22 05:50 +0100
          Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Jerome Glisse <jglisse@redhat.com> - 2016-11-24 15:00 +0100
  [HMM v13 11/18] mm/hmm/mirror: add range monitor helper, to monitor CPU page table update Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
  Re: [HMM v13 00/18] HMM (Heterogeneous Memory Management) v13 John Hubbard <jhubbard@nvidia.com> - 2016-11-19 01:50 +0100
    Re: [HMM v13 00/18] HMM (Heterogeneous Memory Management) v13 "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2016-11-19 16:00 +0100

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