Re: [PATCH v11 4/6] mm: function to offer a page block on the free list

From	David Hildenbrand <david@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v11 4/6] mm: function to offer a page block on the free list
Date	2017-06-20 21:10 +0200
Message-ID	<tUwHf-4ad-19@gated-at.bofh.it> (permalink)
References	(3 earlier) <tUuvM-2D0-1@gated-at.bofh.it> <tUuvM-2D0-15@gated-at.bofh.it> <tUvUR-3DD-15@gated-at.bofh.it> <tUwxz-3RS-3@gated-at.bofh.it> <tUwxz-3RS-1@gated-at.bofh.it>
Organization	Red Hat GmbH

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>> IMHO even simply writing all-zeros to all free pages before starting
>> migration (or even when freeing a page) would be a cleaner interface
>> than this (because it atomically works with the entity the host cares
>> about for migration). But yes, performance is horrible that's why I am
>> not even suggesting it. Just saying that this mm interface is very very
>> special and if we could find something better, I'd favor it.
> 
> As long as there's a single user, changing to a better interface
> once it's found won't be hard at all :)
> 

Hehe, more like "we made this beautiful virtio-balloon extension" - oh
there is free page hinting (assuming that it does not reuse the batch
interface here). Guess how long it would take to at least show that free
page hinting can be done. If it takes another 6 years, I am totally on
your side ;)

-- 

Thanks,

David

Thread

Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list Rik van Riel <riel@redhat.com> - 2017-06-20 18:50 +0200
  Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list David Hildenbrand <david@redhat.com> - 2017-06-20 18:50 +0200
    Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list Rik van Riel <riel@redhat.com> - 2017-06-20 19:30 +0200
      Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list "Michael S. Tsirkin" <mst@redhat.com> - 2017-06-20 20:30 +0200
        Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list Rik van Riel <riel@redhat.com> - 2017-06-20 22:00 +0200
          Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list "Michael S. Tsirkin" <mst@redhat.com> - 2017-06-21 14:50 +0200
      Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block  on the free list Wei Wang <wei.w.wang@intel.com> - 2017-06-21 10:40 +0200
    Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list "Michael S. Tsirkin" <mst@redhat.com> - 2017-06-20 20:20 +0200
      Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list "Michael S. Tsirkin" <mst@redhat.com> - 2017-06-20 21:00 +0200
        Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list David Hildenbrand <david@redhat.com> - 2017-06-20 21:10 +0200
      Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list David Hildenbrand <david@redhat.com> - 2017-06-20 21:00 +0200
    Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list Christian Borntraeger <borntraeger@de.ibm.com> - 2017-06-21 15:00 +0200
      Re: [PATCH v11 4/6] mm: function to offer a page block on the free  list David Hildenbrand <david@redhat.com> - 2017-06-21 15:50 +0200

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