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migration: use dirty_rate_high_cnt more aggressively

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The commit message from 070afca25 suggests that dirty_rate_high_cnt
should be used more aggressively to start throttling after two
iterations instead of four. The code, however, only changes the auto
convergence behaviour to throttle after three iterations. This makes the
behaviour more aggressive by kicking off throttling after two iterations
as originally intended.

Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Felipe Franciosi 2017-05-24 17:10:03 +01:00 committed by Juan Quintela
parent d2a4d85a8a
commit b4a3c64b16
1 changed files with 1 additions and 1 deletions
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migration/ram.c
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@ -708,7 +708,7 @@ static void migration_bitmap_sync(RAMState *rs)
if ((rs->num_dirty_pages_period * TARGET_PAGE_SIZE > if ((rs->num_dirty_pages_period * TARGET_PAGE_SIZE >
(bytes_xfer_now - rs->bytes_xfer_prev) / 2) && (bytes_xfer_now - rs->bytes_xfer_prev) / 2) &&
(rs->dirty_rate_high_cnt++ >= 2)) { (++rs->dirty_rate_high_cnt >= 2)) {
trace_migration_throttle(); trace_migration_throttle();
rs->dirty_rate_high_cnt = 0; rs->dirty_rate_high_cnt = 0;
mig_throttle_guest_down(); mig_throttle_guest_down();