This is 4th version of
[PATCH v1 0/2] Add bitmap for copied pages in postcopy migration
cover message from there
This is a separate patch set, it derived from
https://www.mail-archive.com/qemu-devel@nongnu.org/msg456004.html
There are several possible use cases:
1. solve issue with postcopy live migration and shared memory.
OVS-VSWITCH requires information about copied pages, to fallocate
newly allocated pages.
2. calculation vCPU blocktime
for more details see
https://www.mail-archive.com/qemu-devel@nongnu.org/msg456004.html
3. Recovery after fail in the middle of postcopy migration
Declaration is placed in two places include/migration/migration.h and into
migration/postcopy-ram.h, because some functions are required in virtio and
into public function include/exec/ram_addr.h.
----------------------------------------------------------------
V3 -> V4
- clear_bit instead of ramblock_recv_bitmap_clear in ramblock_recv_bitmap_clear_range, it reduced number of operation (comment from Juan)
- for postcopy ramblock_recv_bitmap_set is calling after page was copied,
only in case of success (comment from David)
- indentation fixes (comment from Juan)
V2 -> V3
- ramblock_recv_map_init call is placed into migration_incoming_get_current,
looks like it's general place for both precopy and postcopy case.
- received bitmap memory releasing is placed into ram_load_cleanup,
unfortunatelly, it calls only in case of precopy.
- precopy case and discard ram block case
- function renaming, and another minor cleanups
V1 -> V2
- change in terminology s/copied/received/g
- granularity became TARGET_PAGE_SIZE, but not actual page size of the
ramblock
- movecopiedmap & get_copiedmap_size were removed, until patch set where
it will be necessary
- releasing memory of receivedmap was added into ram_load_cleanup
- new patch "migration: introduce qemu_ufd_copy_ioctl helper"
Patchset is based on Juan's patchset:
[PATCH v2 0/5] Create setup/cleanup methods for migration incoming side
Alexey Perevalov (3):
migration: postcopy_place_page factoring out
migration: introduce qemu_ufd_copy_ioctl helper
migration: add bitmap for received page
include/exec/ram_addr.h | 10 ++++++++
migration/migration.c | 1 +
migration/postcopy-ram.c | 57 ++++++++++++++++++++++++++++---------------
migration/postcopy-ram.h | 4 +--
migration/ram.c | 63 ++++++++++++++++++++++++++++++++++++++++++++----
migration/ram.h | 6 +++++
6 files changed, 115 insertions(+), 26 deletions(-)
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1.9.1