From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
To: Wei Yang <richardw.yang@linux.intel.com>
Cc: qemu-devel@nongnu.org, quintela@redhat.com
Subject: Re: [PATCH 0/6] migration/postcopy: enable compress during postcopy
Date: Wed, 6 Nov 2019 20:11:44 +0000 [thread overview]
Message-ID: <20191106201144.GM2802@work-vm> (raw)
In-Reply-To: <20191018004850.9888-1-richardw.yang@linux.intel.com>
* Wei Yang (richardw.yang@linux.intel.com) 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.
What have you tested this with? 2MB huge pages I guess?
Dave
> 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 | 65 ++++++++++++++++++++++++++++++-------------
> 2 files changed, 45 insertions(+), 31 deletions(-)
>
> --
> 2.17.1
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
next prev parent reply other threads:[~2019-11-06 20:12 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-18 0:48 [PATCH 0/6] migration/postcopy: enable compress during postcopy Wei Yang
2019-10-18 0:48 ` [PATCH 1/6] migration/postcopy: reduce memset when it is zero page and matches_target_page_size Wei Yang
2019-11-06 18:18 ` Dr. David Alan Gilbert
2019-10-18 0:48 ` [PATCH 2/6] migration/postcopy: wait for decompress thread in precopy Wei Yang
2019-11-06 19:57 ` Dr. David Alan Gilbert
2019-10-18 0:48 ` [PATCH 3/6] migration/postcopy: count target page number to decide the place_needed Wei Yang
2019-11-06 19:59 ` Dr. David Alan Gilbert
2019-10-18 0:48 ` [PATCH 4/6] migration/postcopy: set all_zero to true on the first target page Wei Yang
2019-11-06 20:04 ` Dr. David Alan Gilbert
2019-10-18 0:48 ` [PATCH 5/6] migration/postcopy: enable random order target page arrival Wei Yang
2019-11-06 20:08 ` Dr. David Alan Gilbert
2019-11-07 6:00 ` Wei Yang
2019-11-07 9:14 ` Dr. David Alan Gilbert
2019-10-18 0:48 ` [PATCH 6/6] migration/postcopy: enable compress during postcopy Wei Yang
2019-11-06 19:55 ` Dr. David Alan Gilbert
2019-10-18 16:50 ` [PATCH 0/6] " no-reply
2019-10-19 0:15 ` Wei Yang
2019-11-06 20:11 ` Dr. David Alan Gilbert [this message]
2019-11-07 6:02 ` Wei Yang
2019-11-07 9:15 ` Dr. David Alan Gilbert
2019-11-07 12:03 ` Wei Yang
2019-11-07 12:06 ` Dr. David Alan Gilbert
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