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

[Dr. David Alan Gilbert]

* Wei Yang (address@hidden) wrote:
> Would this one be picked up in this version?

I think that one is on Juan's list for the pull he's going to do soon.

Dave


> 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
> Help you, Help me
> 
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK