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migration: Synchronize multifd threads with main thread

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We synchronize all threads each RAM_SAVE_FLAG_EOS.  Bitmap
synchronizations don't happen inside a  ram section, so we are safe
about two channels trying to overwrite the same memory.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

--
seq needs to be atomic now, will also be accessed from main thread.
Fix the if (true || ...) leftover
We are back to non-atomics
This commit is contained in:
Juan Quintela 2018-02-28 09:10:07 +01:00
parent 0beb5ed327
commit 6df264ac5a
2 changed files with 122 additions and 31 deletions
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6
migration/trace-events
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@ -77,9 +77,15 @@ migration_bitmap_sync_start(void) ""
migration_bitmap_sync_end(uint64_t dirty_pages) "dirty_pages %" PRIu64
migration_throttle(void) ""
multifd_recv(uint8_t id, uint64_t packet_num, uint32_t used, uint32_t flags) "channel %d packet number %" PRIu64 " pages %d flags 0x%x"
multifd_recv_sync_main(long packet_num) "packet num %ld"
multifd_recv_sync_main_signal(uint8_t id) "channel %d"
multifd_recv_sync_main_wait(uint8_t id) "channel %d"
multifd_recv_thread_end(uint8_t id, uint64_t packets, uint64_t pages) "channel %d packets %" PRIu64 " pages %" PRIu64
multifd_recv_thread_start(uint8_t id) "%d"
multifd_send(uint8_t id, uint64_t packet_num, uint32_t used, uint32_t flags) "channel %d packet_num %" PRIu64 " pages %d flags 0x%x"
multifd_send_sync_main(long packet_num) "packet num %ld"
multifd_send_sync_main_signal(uint8_t id) "channel %d"
multifd_send_sync_main_wait(uint8_t id) "channel %d"
multifd_send_thread_end(uint8_t id, uint64_t packets, uint64_t pages) "channel %d packets %" PRIu64 " pages %" PRIu64
multifd_send_thread_start(uint8_t id) "%d"
ram_discard_range(const char *rbname, uint64_t start, size_t len) "%s: start: %" PRIx64 " %zx"