Re: [Patch v2 0/6] migration/postcopy: enable compress during postcopy

[Wei Yang]

Would this one be picked up in this version?

On Thu, Nov 07, 2019 at 08:39:01PM +0800, Wei Yang wrote:
>This patch set tries enable compress during postcopy.
>
>postcopy requires to place a whole host page, while migration thread migrate
>memory in target page size. This makes postcopy need to collect all target
>pages in one host page before placing via userfaultfd.
>
>To enable compress during postcopy, there are two problems to solve:
>
>    1. Random order for target page arrival
>    2. Target pages in one host page arrives without interrupt by target
>       page from other host page
>
>The first one is handled by counting the number of target pages arrived
>instead of the last target page arrived.
>
>The second one is handled by:
>
>    1. Flush compress thread for each host page
>    2. Wait for decompress thread for before placing host page
>
>With the combination of these two changes, compress is enabled during
>postcopy.
>
>---
>v2:
>     * use uintptr_t to calculate place_dest
>     * check target pages belongs to the same host page
>
>Wei Yang (6):
>  migration/postcopy: reduce memset when it is zero page and
>    matches_target_page_size
>  migration/postcopy: wait for decompress thread in precopy
>  migration/postcopy: count target page number to decide the
>    place_needed
>  migration/postcopy: set all_zero to true on the first target page
>  migration/postcopy: enable random order target page arrival
>  migration/postcopy: enable compress during postcopy
>
> migration/migration.c | 11 -------
> migration/ram.c       | 67 +++++++++++++++++++++++++++++++++----------
> 2 files changed, 52 insertions(+), 26 deletions(-)
>
>-- 
>2.17.1

-- 
Wei Yang
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