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migration/multifd: Implement zero page transmission on the multifd thread.

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1. Add zero_pages field in MultiFDPacket_t.
2. Implements the zero page detection and handling on the multifd
threads for non-compression, zlib and zstd compression backends.
3. Added a new value 'multifd' in ZeroPageDetection enumeration.
4. Adds zero page counters and updates multifd send/receive tracing
format to track the newly added counters.

Signed-off-by: Hao Xiang <hao.xiang@bytedance.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240311180015.3359271-5-hao.xiang@linux.dev
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Hao Xiang 2024-03-11 18:00:12 +00:00 • committed by Peter Xu
parent 5fdbb1dfcc
commit 303e6f54f9
10 changed files with 228 additions and 32 deletions
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1
migration/ram.c
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@ -1288,7 +1288,6 @@ static int ram_save_multifd_page(RAMBlock *block, ram_addr_t offset)
if (!multifd_queue_page(block, offset)) {
return -1;
}
stat64_add(&mig_stats.normal_pages, 1);
return 1;
}