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| author | Keqian Zhu <zhukeqian1@huawei.com> | 2020-04-13 18:15:08 +0800 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2020-05-07 17:40:24 +0100 |
| commit | cbbf818224faf5ede75c876e4900c9f8e6b6c0db (patch) | |
| tree | 784aaa0ad9cf5964fb0c5219d629afea051423bb /monitor | |
| parent | 58602676dfd00f519248d4936b0711b7967cbf62 (diff) | |
| download | qemu-cbbf818224faf5ede75c876e4900c9f8e6b6c0db.zip qemu-cbbf818224faf5ede75c876e4900c9f8e6b6c0db.tar.gz qemu-cbbf818224faf5ede75c876e4900c9f8e6b6c0db.tar.bz2 | |
migration/throttle: Add cpu-throttle-tailslow migration parameter
At the tail stage of throttling, the Guest is very sensitive to
CPU percentage while the @cpu-throttle-increment is excessive
usually at tail stage.
If this parameter is true, we will compute the ideal CPU percentage
used by the Guest, which may exactly make the dirty rate match the
dirty rate threshold. Then we will choose a smaller throttle increment
between the one specified by @cpu-throttle-increment and the one
generated by ideal CPU percentage.
Therefore, it is compatible to traditional throttling, meanwhile
the throttle increment won't be excessive at tail stage. This may
make migration time longer, and is disabled by default.
Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Message-Id: <20200413101508.54793-1-zhukeqian1@huawei.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'monitor')
| -rw-r--r-- | monitor/hmp-cmds.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c index 1552dee..ade1f85 100644 --- a/monitor/hmp-cmds.c +++ b/monitor/hmp-cmds.c @@ -420,6 +420,10 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict) monitor_printf(mon, "%s: %u\n", MigrationParameter_str(MIGRATION_PARAMETER_CPU_THROTTLE_INCREMENT), params->cpu_throttle_increment); + assert(params->has_cpu_throttle_tailslow); + monitor_printf(mon, "%s: %s\n", + MigrationParameter_str(MIGRATION_PARAMETER_CPU_THROTTLE_TAILSLOW), + params->cpu_throttle_tailslow ? "on" : "off"); assert(params->has_max_cpu_throttle); monitor_printf(mon, "%s: %u\n", MigrationParameter_str(MIGRATION_PARAMETER_MAX_CPU_THROTTLE), @@ -1275,6 +1279,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict) p->has_cpu_throttle_increment = true; visit_type_int(v, param, &p->cpu_throttle_increment, &err); break; + case MIGRATION_PARAMETER_CPU_THROTTLE_TAILSLOW: + p->has_cpu_throttle_tailslow = true; + visit_type_bool(v, param, &p->cpu_throttle_tailslow, &err); + break; case MIGRATION_PARAMETER_MAX_CPU_THROTTLE: p->has_max_cpu_throttle = true; visit_type_int(v, param, &p->max_cpu_throttle, &err); |