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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>
master
Hyman Huang(黄勇) 2023-06-15 21:29:44 +08:00 committed by Juan Quintela
parent bb9993c672
commit 310ad5625e
1 changed files with 11 additions and 10 deletions
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21
migration/ram.c
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@ -999,17 +999,18 @@ static void migration_trigger_throttle(RAMState *rs)
return;
}
if (migrate_auto_converge()) {
/* The following detection logic can be refined later. For now:
Check to see if the ratio between dirtied bytes and the approx.
amount of bytes that just got transferred since the last time
we were in this routine reaches the threshold. If that happens
twice, start or increase throttling. */
if ((bytes_dirty_period > bytes_dirty_threshold) &&
(++rs->dirty_rate_high_cnt >= 2)) {
/*
* The following detection logic can be refined later. For now:
* Check to see if the ratio between dirtied bytes and the approx.
* amount of bytes that just got transferred since the last time
* we were in this routine reaches the threshold. If that happens
* twice, start or increase throttling.
*/
if ((bytes_dirty_period > bytes_dirty_threshold) &&
(++rs->dirty_rate_high_cnt >= 2)) {
rs->dirty_rate_high_cnt = 0;
if (migrate_auto_converge()) {
trace_migration_throttle();
rs->dirty_rate_high_cnt = 0;
mig_throttle_guest_down(bytes_dirty_period,
bytes_dirty_threshold);
}