migration: Put the detection logic before auto-converge checking
This commit is prepared for the implementation of dirty-limit convergence algo. The detection logic of throttling condition can apply to both auto-converge and dirty-limit algo, putting it's position before the checking logic for auto-converge feature. Signed-off-by: Hyman Huang(黄勇) <yong.huang@smartx.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-ID: <168733225273.5845.15871826788879741674-6@git.sr.ht> Signed-off-by: Juan Quintela <quintela@redhat.com>
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@ -999,17 +999,18 @@ static void migration_trigger_throttle(RAMState *rs)
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return;
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}
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if (migrate_auto_converge()) {
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/* The following detection logic can be refined later. For now:
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Check to see if the ratio between dirtied bytes and the approx.
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amount of bytes that just got transferred since the last time
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we were in this routine reaches the threshold. If that happens
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twice, start or increase throttling. */
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if ((bytes_dirty_period > bytes_dirty_threshold) &&
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(++rs->dirty_rate_high_cnt >= 2)) {
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/*
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* The following detection logic can be refined later. For now:
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* Check to see if the ratio between dirtied bytes and the approx.
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* amount of bytes that just got transferred since the last time
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* we were in this routine reaches the threshold. If that happens
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* twice, start or increase throttling.
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*/
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if ((bytes_dirty_period > bytes_dirty_threshold) &&
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(++rs->dirty_rate_high_cnt >= 2)) {
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rs->dirty_rate_high_cnt = 0;
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if (migrate_auto_converge()) {
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trace_migration_throttle();
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rs->dirty_rate_high_cnt = 0;
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mig_throttle_guest_down(bytes_dirty_period,
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bytes_dirty_threshold);
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}
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