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[Qemu-devel] [PATCH v2 00/51] Creating RAMState for migration

From: Juan Quintela
Subject: [Qemu-devel] [PATCH v2 00/51] Creating RAMState for migration
Date: Thu, 23 Mar 2017 21:44:53 +0100


Continuation of previous series, all review comments addressed. New things:
- Consolidate all function comments in the same style (yes, docs)
- Be much more careful with maintaining comments correct
- Move all postcopy fields to RAMState
- Move QEMUFile to RAMState
- rename qemu_target_page_bits() to qemu_target_page_size() to reflect use
- Remove MigrationState from functions that don't need it
- reorganize last_sent_block to the place where it is used/needed
- Move several places from offsets to pages
- Rename last_ram_offset() to last_ram_page() to refect use

Please comment.

Currently, we have several places where we store informaticon about
ram for migration pruposes:
- global variables on migration/ram.c
- inside the accounting_info struct in migration/ram.c
  notice that not all the accounting vars are inside there
- some stuff is in MigrationState, althought it belongs to migrate/ram.c

So, this series does:
- move everything related to ram.c to RAMState struct
- make all the statistics consistent, exporting them with an accessor

Why now?

Because I am trying to do some more optimizations about how we send
data around and it is basically impossible to do with current code, we
still need to add more variables.  Notice that there are things like that:
- accounting info was only reset if we had xbzrle enabled
- How/where to initialize variables are completely inconsistent.

To Do:

- There are still places that access directly the global struct.
  Mainly postcopy.  We could finfd a way to make a pointer to the
  current migration.  If people like the approach, I will search where
  to put it.
- I haven't posted any real change here, this is just the move of
  variables to the struct and pass the struct around.  Optimizations
  will came after.

- Consolidate XBZRLE, Compression params, etc in its own structs
  (inside or not RAMState, to be able to allocate ones, others, or

Comments, please.

Chao Fan (1):
  Add page-size to output in 'info migrate'

Juan Quintela (50):
  ram: Update all functions comments
  ram: rename block_name to rbname
  ram: Create RAMState
  ram: Add dirty_rate_high_cnt to RAMState
  ram: Move bitmap_sync_count into RAMState
  ram: Move start time into RAMState
  ram: Move bytes_xfer_prev into RAMState
  ram: Move num_dirty_pages_period into RAMState
  ram: Move xbzrle_cache_miss_prev into RAMState
  ram: Move iterations_prev into RAMState
  ram: Move dup_pages into RAMState
  ram: Remove unused dup_mig_bytes_transferred()
  ram: Remove unused pages_skipped variable
  ram: Move norm_pages to RAMState
  ram: Remove norm_mig_bytes_transferred
  ram: Move iterations into RAMState
  ram: Move xbzrle_bytes into RAMState
  ram: Move xbzrle_pages into RAMState
  ram: Move xbzrle_cache_miss into RAMState
  ram: Move xbzrle_cache_miss_rate into RAMState
  ram: Move xbzrle_overflows into RAMState
  ram: Move migration_dirty_pages to RAMState
  ram: Everything was init to zero, so use memset
  ram: Move migration_bitmap_mutex into RAMState
  ram: Move migration_bitmap_rcu into RAMState
  ram: Move bytes_transferred into RAMState
  ram: Use the RAMState bytes_transferred parameter
  ram: Remove ram_save_remaining
  ram: Move last_req_rb to RAMState
  ram: Move src_page_req* to RAMState
  ram: Create ram_dirty_sync_count()
  ram: Remove dirty_bytes_rate
  ram: Move dirty_pages_rate to RAMState
  ram: Move postcopy_requests into RAMState
  ram: Add QEMUFile to RAMState
  ram: Move QEMUFile into RAMState
  ram: Move compression_switch to RAMState
  migration: Remove MigrationState from migration_in_postcopy
  ram: We don't need MigrationState parameter anymore
  ram: Rename qemu_target_page_bits() to qemu_target_page_size()
  ram: Pass RAMBlock to bitmap_sync
  ram: ram_discard_range() don't use the mis parameter
  ram: reorganize last_sent_block
  ram: Use page number instead of an address for the bitmap operations
  ram: Remember last_page instead of last_offset
  ram: Change offset field in PageSearchStatus to page
  ram: Use ramblock and page offset instead of absolute offset
  ram: rename last_ram_offset() last_ram_pages()
  ram: Use RAMBitmap type for coherence
  migration: Remove MigrationState parameter from migration_is_idle()

 exec.c                        |   10 +-
 hmp.c                         |    3 +
 include/exec/ram_addr.h       |    4 +-
 include/migration/migration.h |   41 +-
 include/sysemu/sysemu.h       |    2 +-
 migration/migration.c         |   44 +-
 migration/postcopy-ram.c      |   14 +-
 migration/ram.c               | 1190 ++++++++++++++++++++++-------------------
 migration/savevm.c            |   15 +-
 migration/trace-events        |    2 +-
 qapi-schema.json              |    5 +-
 11 files changed, 695 insertions(+), 635 deletions(-)


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