Re: [PATCH v4 0/3] Zero copy improvements (QIOChannel + multifd)

[Dr. David Alan Gilbert]

* Leonardo Bras (leobras@redhat.com) wrote:
> The first patch avoid spuriously returning 1 [*] when zero-copy flush is
> attempted before any buffer was sent using MSG_ZEROCOPY.
> 
> [*] zero-copy not being used, even though it's enabled and supported
> by kernel
> 
> The second patch introduces a new migration stat
> (dirty-sync-missed-zero-copy) that will be used to keep track of [*]. 
> 
> The third patch keeps track of how many zero-copy flushes retured 1 [*]
> 
> Changes since v3:
> - Patch#1: Also checks if no packet was queued after the last flush
> - Patch#2: Improve dirty-sync-missed-zero-copy doc and hmp print message
> 
> Changes since v2:
> - Documentation release number changed from 7.2 to 7.1
> - migration stat renamed from zero-copy-copied to 
>   dirty-sync-missed-zero-copy
> - Updated documentation to make it more user-friendly
> 
> Changes since v1:
> - Idea of using a warning replaced by using a migration stat counter

Queued
> 
> 
> 
> Leonardo Bras (3):
>   QIOChannelSocket: Fix zero-copy flush returning code 1 when nothing
>     sent
>   Add dirty-sync-missed-zero-copy migration stat
>   migration/multifd: Report to user when zerocopy not working
> 
>  qapi/migration.json   | 7 ++++++-
>  migration/ram.h       | 2 ++
>  io/channel-socket.c   | 8 +++++++-
>  migration/migration.c | 2 ++
>  migration/multifd.c   | 2 ++
>  migration/ram.c       | 5 +++++
>  monitor/hmp-cmds.c    | 5 +++++
>  7 files changed, 29 insertions(+), 2 deletions(-)
> 
> -- 
> 2.37.0
> 
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK