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![]() Implement the outgoing migration side for the 'mapped-ram' capability. A bitmap is introduced to track which pages have been written in the migration file. Pages are written at a fixed location for every ramblock. Zero pages are ignored as they'd be zero in the destination migration as well. The migration stream is altered to put the dirty pages for a ramblock after its header instead of having a sequential stream of pages that follow the ramblock headers. Without mapped-ram (current): With mapped-ram (new): --------------------- -------------------------------- | ramblock 1 header | | ramblock 1 header | --------------------- -------------------------------- | ramblock 2 header | | ramblock 1 mapped-ram header | --------------------- -------------------------------- | ... | | padding to next 1MB boundary | --------------------- | ... | | ramblock n header | -------------------------------- --------------------- | ramblock 1 pages | | RAM_SAVE_FLAG_EOS | | ... | --------------------- -------------------------------- | stream of pages | | ramblock 2 header | | (iter 1) | -------------------------------- | ... | | ramblock 2 mapped-ram header | --------------------- -------------------------------- | RAM_SAVE_FLAG_EOS | | padding to next 1MB boundary | --------------------- | ... | | stream of pages | -------------------------------- | (iter 2) | | ramblock 2 pages | | ... | | ... | --------------------- -------------------------------- | ... | | ... | --------------------- -------------------------------- | RAM_SAVE_FLAG_EOS | -------------------------------- | ... | -------------------------------- where: - ramblock header: the generic information for a ramblock, such as idstr, used_len, etc. - ramblock mapped-ram header: the new information added by this feature: bitmap of pages written, bitmap size and offset of pages in the migration file. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de> Link: https://lore.kernel.org/r/20240229153017.2221-10-farosas@suse.de Signed-off-by: Peter Xu <peterx@redhat.com> |
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.. | ||
block-dirty-bitmap.c | ||
block.c | ||
block.h | ||
channel-block.c | ||
channel-block.h | ||
channel.c | ||
channel.h | ||
colo-failover.c | ||
colo.c | ||
dirtyrate.c | ||
dirtyrate.h | ||
exec.c | ||
exec.h | ||
fd.c | ||
fd.h | ||
file.c | ||
file.h | ||
global_state.c | ||
meson.build | ||
migration-hmp-cmds.c | ||
migration-stats.c | ||
migration-stats.h | ||
migration.c | ||
migration.h | ||
multifd-zlib.c | ||
multifd-zstd.c | ||
multifd.c | ||
multifd.h | ||
options.c | ||
options.h | ||
page_cache.c | ||
page_cache.h | ||
postcopy-ram.c | ||
postcopy-ram.h | ||
qemu-file.c | ||
qemu-file.h | ||
ram-compress.c | ||
ram-compress.h | ||
ram.c | ||
ram.h | ||
rdma.c | ||
rdma.h | ||
savevm.c | ||
savevm.h | ||
socket.c | ||
socket.h | ||
target.c | ||
threadinfo.c | ||
threadinfo.h | ||
tls.c | ||
tls.h | ||
trace-events | ||
trace.h | ||
vmstate-types.c | ||
vmstate.c | ||
xbzrle.c | ||
xbzrle.h | ||
yank_functions.c | ||
yank_functions.h |