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Re: [PATCH v2 07/13] migration/ram: Discard RAM when growing RAM blocks
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From: |
Peter Xu |
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Subject: |
Re: [PATCH v2 07/13] migration/ram: Discard RAM when growing RAM blocks after ram_postcopy_incoming_init() |
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Date: |
Mon, 24 Feb 2020 17:28:07 -0500 |
On Fri, Feb 21, 2020 at 05:41:58PM +0100, David Hildenbrand wrote:
> In case we grow our RAM after ram_postcopy_incoming_init() (e.g., when
> synchronizing the RAM block state with the migration source), the resized
> part would not get discarded. Let's perform that when being notified
> about a resize while postcopy has been advised, but is not listening
> yet. With precopy, the process is as following:
>
> 1. VM created
> - RAM blocks are created
> 2. Incomming migration started
> - Postcopy is advised
> - All pages in RAM blocks are discarded
> 3. Precopy starts
> - RAM blocks are resized to match the size on the migration source.
> - RAM pages from precopy stream are loaded
> - Uffd handler is registered, postcopy starts listening
> 3. Guest started, postcopy running
> - Pagefaults get resolved, pages get placed
>
> Cc: "Dr. David Alan Gilbert" <address@hidden>
> Cc: Juan Quintela <address@hidden>
> Cc: Peter Xu <address@hidden>
> Signed-off-by: David Hildenbrand <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
--
Peter Xu
- [PATCH v2 01/13] util: vfio-helpers: Factor out and fix processing of existing ram blocks, (continued)
- [PATCH v2 01/13] util: vfio-helpers: Factor out and fix processing of existing ram blocks, David Hildenbrand, 2020/02/21
- [PATCH v2 02/13] stubs/ram-block: Remove stubs that are no longer needed, David Hildenbrand, 2020/02/21
- [PATCH v2 03/13] numa: Teach ram block notifiers about resizeable ram blocks, David Hildenbrand, 2020/02/21
- [PATCH v2 04/13] numa: Make all callbacks of ram block notifiers optional, David Hildenbrand, 2020/02/21
- [PATCH v2 05/13] migration/ram: Handle RAM block resizes during precopy, David Hildenbrand, 2020/02/21
- [PATCH v2 06/13] exec: Relax range check in ram_block_discard_range(), David Hildenbrand, 2020/02/21
- [PATCH v2 08/13] migration/ram: Simplify host page handling in ram_load_postcopy(), David Hildenbrand, 2020/02/21
- [PATCH v2 07/13] migration/ram: Discard RAM when growing RAM blocks after ram_postcopy_incoming_init(), David Hildenbrand, 2020/02/21
- Re: [PATCH v2 07/13] migration/ram: Discard RAM when growing RAM blocks after ram_postcopy_incoming_init(),
Peter Xu <=
- [PATCH v2 09/13] migration/ram: Consolidate variable reset after placement in ram_load_postcopy(), David Hildenbrand, 2020/02/21
- [PATCH v2 10/13] migration/ram: Handle RAM block resizes during postcopy, David Hildenbrand, 2020/02/21
- [PATCH v2 11/13] migration/multifd: Print used_length of memory block, David Hildenbrand, 2020/02/21
- [PATCH v2 12/13] migration/ram: Use offset_in_ramblock() in range checks, David Hildenbrand, 2020/02/21
- [PATCH v2 13/13] migration/ram: Tolerate partially changed mappings in postcopy code, David Hildenbrand, 2020/02/21