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Re: [Patch v2 0/6] migration/postcopy: enable compress during postcopy
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Patch v2 0/6] migration/postcopy: enable compress during postcopy |
Date: |
Wed, 18 Dec 2019 19:55:38 +0000 |
User-agent: |
Mutt/1.13.0 (2019-11-30) |
* 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