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migration/multifd: solve zero page causing multiple page faults

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Implemented recvbitmap tracking of received pages in multifd.

If the zero page appears for the first time in the recvbitmap, this
page is not checked and set.

If the zero page has already appeared in the recvbitmap, there is no
need to check the data but directly set the data to 0, because it is
unlikely that the zero page will be migrated multiple times.

Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240401154110.2028453-2-yuan1.liu@intel.com
[peterx: touch up the comment, as the bitmap is used outside postcopy now]
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Yuan Liu 2024-04-01 23:41:10 +08:00 • committed by Peter Xu
parent dd03167725
commit 5ef7e26bdb
7 changed files with 12 additions and 2 deletions
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migration/ram.h
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@ -69,6 +69,7 @@ int ramblock_recv_bitmap_test(RAMBlock *rb, void *host_addr);
bool ramblock_recv_bitmap_test_byte_offset(RAMBlock *rb, uint64_t byte_offset);
void ramblock_recv_bitmap_set(RAMBlock *rb, void *host_addr);
void ramblock_recv_bitmap_set_range(RAMBlock *rb, void *host_addr, size_t nr);
void ramblock_recv_bitmap_set_offset(RAMBlock *rb, uint64_t byte_offset);
int64_t ramblock_recv_bitmap_send(QEMUFile *file,
const char *block_name);
bool ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *rb, Error **errp);