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migration: set dirty_pages_rate before autoconverge logic 

Currently, a "period" in the RAM migration logic is at least a second
long and accounts for what happened since the last period (or the
beginning of the migration). The dirty_pages_rate counter is calculated
at the end this logic.

If the auto convergence capability is enabled from the start of the
migration, it won't be able to use this counter the first time around.
This calculates dirty_pages_rate as soon as a period is deemed over,
which allows for it to be used immediately.

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>
master
Felipe Franciosi 2017-05-24 17:10:01 +01:00 committed by Juan Quintela
parent 9884db2814
commit d693c6f10f
1 changed files with 10 additions and 7 deletions
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17
migration/ram.c
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@ -694,6 +694,10 @@ static void migration_bitmap_sync(RAMState *rs)
/* more than 1 second = 1000 millisecons */
if (end_time > rs->time_last_bitmap_sync + 1000) {
/* calculate period counters */
rs->dirty_pages_rate = rs->num_dirty_pages_period * 1000
/ (end_time - rs->time_last_bitmap_sync);
if (migrate_auto_converge()) {
/* The following detection logic can be refined later. For now:
Check to see if the dirtied bytes is 50% more than the approx.
@ -702,15 +706,14 @@ static void migration_bitmap_sync(RAMState *rs)
throttling */
bytes_xfer_now = ram_bytes_transferred();
if (rs->dirty_pages_rate &&
(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) &&
(rs->dirty_rate_high_cnt++ >= 2)) {
(rs->dirty_rate_high_cnt++ >= 2)) {
trace_migration_throttle();
rs->dirty_rate_high_cnt = 0;
mig_throttle_guest_down();
}
rs->bytes_xfer_prev = bytes_xfer_now;
}
rs->bytes_xfer_prev = bytes_xfer_now;
}
if (migrate_use_xbzrle()) {
@ -723,8 +726,8 @@ static void migration_bitmap_sync(RAMState *rs)
rs->iterations_prev = rs->iterations;
rs->xbzrle_cache_miss_prev = rs->xbzrle_cache_miss;
}
rs->dirty_pages_rate = rs->num_dirty_pages_period * 1000
/ (end_time - rs->time_last_bitmap_sync);
/* reset period counters */
rs->time_last_bitmap_sync = end_time;
rs->num_dirty_pages_period = 0;
}