migration/block: limit the number of parallel I/O requests
the current implementation submits up to 512 I/O requests in parallel which is much to high especially for a background task. This patch adds a maximum limit of 16 I/O requests that can be submitted in parallel to avoid monopolizing the I/O device. Signed-off-by: Peter Lieven <pl@kamp.de> Message-Id: <1520507908-16743-5-git-send-email-pl@kamp.de> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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@ -37,6 +37,7 @@
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#define MAX_IS_ALLOCATED_SEARCH (65536 * BDRV_SECTOR_SIZE)
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#define MAX_IS_ALLOCATED_SEARCH (65536 * BDRV_SECTOR_SIZE)
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#define MAX_IO_BUFFERS 512
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#define MAX_IO_BUFFERS 512
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#define MAX_PARALLEL_IO 16
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//#define DEBUG_BLK_MIGRATION
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//#define DEBUG_BLK_MIGRATION
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@ -775,6 +776,7 @@ static int block_save_iterate(QEMUFile *f, void *opaque)
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while ((block_mig_state.submitted +
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while ((block_mig_state.submitted +
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block_mig_state.read_done) * BLOCK_SIZE <
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block_mig_state.read_done) * BLOCK_SIZE <
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qemu_file_get_rate_limit(f) &&
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qemu_file_get_rate_limit(f) &&
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block_mig_state.submitted < MAX_PARALLEL_IO &&
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(block_mig_state.submitted + block_mig_state.read_done) <
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(block_mig_state.submitted + block_mig_state.read_done) <
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MAX_IO_BUFFERS) {
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MAX_IO_BUFFERS) {
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blk_mig_unlock();
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blk_mig_unlock();
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