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[Qemu-devel] [RFC 00/13] Multiple fd migration support

From: Juan Quintela
Subject: [Qemu-devel] [RFC 00/13] Multiple fd migration support
Date: Wed, 20 Apr 2016 16:44:28 +0200


This patch series is "an" initial implementation of multiple fd migration.
This is to get something out for others to comment, it is not finished at all.

So far:

- we create threads for each new fd

- only for tcp of course, rest of transports are out of luck
  I need to integrate this with daniel channel changes

- I *think* the locking is right, at least I don't get more random
  lookups (and yes, it was not trivial).  And yes, I think that the
  compression code locking is not completely correct.  I think it
  would be much, much better to do the compression code on top of this
  (will avoid a lot of copies), but I need to finish this first.

- Last patch, I add a BIG hack to try to know what the real bandwidth

Preleminar testing so far:

- quite good, the latency is much better, but was change so far, I
  think I found the problem for the random high latencies, but more
  testing is needed.

- under load, I think our bandwidth calculations are *not* completely
  correct (This is the way to spell it to be allowed for a family audience).

ToDo list:
- bandwidth calculation: I am going to send another mail
  with my ToDo list for migration, see there.

- stats: We need better stats, by thread, etc

- sincronize less times with the worker threads.
  right now we syncronize for each page, there are two obvious optimizations
  * send a list of pages each time we wakeup an fd
  * if we have to sent a HUGE page, dont' do a single split, just sent the 
whole page
    in one send() and read things with a single recv() on destination.
    My understanding is that this would make Transparent Huge pages trivial.
- measure things under bigger loads

Comments, please?

Later, Juan.

Juan Quintela (13):
  migration: create Migration Incoming State at init time
  migration: Pass TCP args in an struct
  migration: [HACK] Don't create decompression threads if not enabled
  migration: Add multifd capability
  migration: Create x-multifd-threads parameter
  migration: create multifd migration threads
  migration: Start of multiple fd work
  migration: create ram_multifd_page
  migration: Create thread infrastructure for multifd send side
  migration: Send the fd number which we are going to use for this page
  migration: Create thread infrastructure for multifd recv side
  migration: Test new fd infrastructure
  migration: [HACK]Transfer pages over new channels

 hmp.c                         |  10 ++
 include/migration/migration.h |  13 ++
 migration/migration.c         | 100 ++++++++----
 migration/ram.c               | 350 +++++++++++++++++++++++++++++++++++++++++-
 migration/savevm.c            |   3 +-
 migration/tcp.c               |  76 ++++++++-
 qapi-schema.json              |  29 +++-
 7 files changed, 540 insertions(+), 41 deletions(-)


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