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implement dynamic migration_downtime

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changelog:

- increment counter also if remaining memory equal 0 (qemu 1.4 migration code)
- only increment coutner and set down_time if memory transfert have occured. (to avoid too fast downtime increment)

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
This commit is contained in:
Stefan Priebe 2012-12-30 19:02:59 +01:00 committed by Dietmar Maurer
parent 7bfdeb5f90
commit 865ef13278
1 changed files with 19 additions and 1 deletions
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20
PVE/QemuMigrate.pm
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@ -349,7 +349,7 @@ sub phase2 {
if (defined($migrate_downtime)) {
$self->log('info', "migrate_set_downtime: $migrate_downtime");
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_set_downtime", value => int($migrate_downtime));
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_set_downtime", value => int($migrate_downtime*100)/100);
};
$self->log('info', "migrate_set_downtime error: $@") if $@;
}
@ -377,6 +377,8 @@ sub phase2 {
my $usleep = 2000000;
my $i = 0;
my $err_count = 0;
my $lastrem = undef;
my $downtimecounter = 0;
while (1) {
$i++;
my $avglstat = $lstat/$i if $lstat;
@ -433,8 +435,24 @@ sub phase2 {
"remaining ${rem}), total ${total}) , expected downtime ${expected_downtime}");
#$self->log('info', "migration xbzrle cachesize: ${xbzrlecachesize} transferred ${xbzrlebytes} pages ${xbzrlepages} cachemiss ${xbzrlecachemiss} overflow ${xbzrleoverflow}");
if (($lastrem && $rem > $lastrem ) || ($rem == 0)) {
$downtimecounter++;
}
$lastrem = $rem;
if ($downtimecounter > 5) {
$downtimecounter = 0;
$migrate_downtime *= 2;
$self->log('info', "migrate_set_downtime: $migrate_downtime");
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_set_downtime", value => int($migrate_downtime*100)/100);
};
$self->log('info', "migrate_set_downtime error: $@") if $@;
}
}
$lstat = $stat->{ram}->{transferred};
} else {