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block-migration: efficiently encode zero blocks

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this patch adds a efficient encoding for zero blocks by
adding a new flag indicating a block is completely zero.

additionally bdrv_write_zeros() is used at the destination
to efficiently write these zeroes. depending on the implementation
this avoids that the destination target gets fully provisioned.

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Peter Lieven 2013-07-18 09:48:50 +02:00 • committed by Stefan Hajnoczi
parent 8bf9344ad6
commit 323004a39d
4 changed files with 43 additions and 7 deletions
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include/migration/migration.h
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@ -124,6 +124,7 @@ void migrate_add_blocker(Error *reason);
void migrate_del_blocker(Error *reason);
bool migrate_rdma_pin_all(void);
bool migrate_zero_blocks(void);
bool migrate_auto_converge(void);