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Re: [Qemu-devel] [PATCH 04/13] migration: Create x-multifd-threads param
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH 04/13] migration: Create x-multifd-threads parameter |
Date: |
Wed, 26 Oct 2016 19:33:45 +0100 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
* Juan Quintela (address@hidden) wrote:
> Indicates the number of threads that we would create. By default we
> create 2 threads.
>
> Signed-off-by: Juan Quintela <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
> ---
> hmp.c | 7 +++++++
> include/migration/migration.h | 2 ++
> migration/migration.c | 24 ++++++++++++++++++++++++
> qapi-schema.json | 11 +++++++++--
> 4 files changed, 42 insertions(+), 2 deletions(-)
>
> diff --git a/hmp.c b/hmp.c
> index 80f7f1f..54f9f03 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -318,6 +318,9 @@ void hmp_info_migrate_parameters(Monitor *mon, const
> QDict *qdict)
> monitor_printf(mon, " %s: %" PRId64 " milliseconds",
> MigrationParameter_lookup[MIGRATION_PARAMETER_DOWNTIME_LIMIT],
> params->downtime_limit);
> + monitor_printf(mon, " %s: %" PRId64,
> + MigrationParameter_lookup[MIGRATION_PARAMETER_X_MULTIFD_THREADS],
> + params->x_multifd_threads);
> monitor_printf(mon, "\n");
> }
>
> @@ -1386,6 +1389,9 @@ void hmp_migrate_set_parameter(Monitor *mon, const
> QDict *qdict)
> p.has_downtime_limit = true;
> use_int_value = true;
> break;
> + case MIGRATION_PARAMETER_X_MULTIFD_THREADS:
> + p.has_x_multifd_threads = true;
> + break;
> }
>
> if (use_int_value) {
> @@ -1402,6 +1408,7 @@ void hmp_migrate_set_parameter(Monitor *mon, const
> QDict *qdict)
> p.cpu_throttle_initial = valueint;
> p.cpu_throttle_increment = valueint;
> p.downtime_limit = valueint;
> + p.x_multifd_threads = valueint;
> }
>
> qmp_migrate_set_parameters(&p, &err);
> diff --git a/include/migration/migration.h b/include/migration/migration.h
> index 5666068..709355e 100644
> --- a/include/migration/migration.h
> +++ b/include/migration/migration.h
> @@ -240,6 +240,8 @@ bool migration_in_postcopy(MigrationState *);
> bool migration_in_postcopy_after_devices(MigrationState *);
> MigrationState *migrate_get_current(void);
>
> +int migrate_multifd_threads(void);
> +
> void migrate_compress_threads_create(void);
> void migrate_compress_threads_join(void);
> void migrate_decompress_threads_create(void);
> diff --git a/migration/migration.c b/migration/migration.c
> index 5f7a570..217ccbc 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -62,6 +62,8 @@
> /* Migration XBZRLE default cache size */
> #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
>
> +#define DEFAULT_MIGRATE_MULTIFD_THREADS 2
> +
> static NotifierList migration_state_notifiers =
> NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
>
> @@ -94,6 +96,7 @@ MigrationState *migrate_get_current(void)
> .cpu_throttle_increment = DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT,
> .max_bandwidth = MAX_THROTTLE,
> .downtime_limit = DEFAULT_MIGRATE_SET_DOWNTIME,
> + .x_multifd_threads = DEFAULT_MIGRATE_MULTIFD_THREADS,
> },
> };
>
> @@ -567,6 +570,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error
> **errp)
> params->max_bandwidth = s->parameters.max_bandwidth;
> params->has_downtime_limit = true;
> params->downtime_limit = s->parameters.downtime_limit;
> + params->has_x_multifd_threads = true;
> + params->x_multifd_threads = s->parameters.x_multifd_threads;
>
> return params;
> }
> @@ -813,6 +818,13 @@ void qmp_migrate_set_parameters(MigrationParameters
> *params, Error **errp)
> "an integer in the range of 0 to 2000000 milliseconds");
> return;
> }
> + if (params->has_x_multifd_threads &&
> + (params->x_multifd_threads < 1 || params->x_multifd_threads >
> 255)) {
> + error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
> + "multifd_threads",
> + "is invalid, it should be in the range of 1 to 255");
> + return;
> + }
>
> if (params->has_compress_level) {
> s->parameters.compress_level = params->compress_level;
> @@ -847,6 +859,9 @@ void qmp_migrate_set_parameters(MigrationParameters
> *params, Error **errp)
> if (params->has_downtime_limit) {
> s->parameters.downtime_limit = params->downtime_limit;
> }
> + if (params->has_x_multifd_threads) {
> + s->parameters.x_multifd_threads = params->x_multifd_threads;
> + }
> }
>
>
> @@ -1282,6 +1297,15 @@ bool migrate_multifd(void)
> return s->enabled_capabilities[MIGRATION_CAPABILITY_X_MULTIFD];
> }
>
> +int migrate_multifd_threads(void)
> +{
> + MigrationState *s;
> +
> + s = migrate_get_current();
> +
> + return s->parameters.x_multifd_threads;
> +}
> +
> int migrate_use_xbzrle(void)
> {
> MigrationState *s;
> diff --git a/qapi-schema.json b/qapi-schema.json
> index bc96ee4..b5c9a06 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -665,13 +665,16 @@
> # @downtime-limit: set maximum tolerated downtime for migration. maximum
> # downtime in milliseconds (Since 2.8)
> #
> +# @x-multifd-threads: Number of threads used to migrate data in parallel
> +# The default value is 1 (since 2.8)
> +#
> # Since: 2.4
> ##
> { 'enum': 'MigrationParameter',
> 'data': ['compress-level', 'compress-threads', 'decompress-threads',
> 'cpu-throttle-initial', 'cpu-throttle-increment',
> 'tls-creds', 'tls-hostname', 'max-bandwidth',
> - 'downtime-limit'] }
> + 'downtime-limit', 'x-multifd-threads'] }
>
> #
> # @migrate-set-parameters
> @@ -726,6 +729,9 @@
> # @downtime-limit: set maximum tolerated downtime for migration. maximum
> # downtime in milliseconds (Since 2.8)
> #
> +# @x-multifd-threads: Number of threads used to migrate data in parallel
> +# The default value is 1 (since 2.8)
> +#
> # Since: 2.4
> ##
> { 'struct': 'MigrationParameters',
> @@ -737,7 +743,8 @@
> '*tls-creds': 'str',
> '*tls-hostname': 'str',
> '*max-bandwidth': 'int',
> - '*downtime-limit': 'int'} }
> + '*downtime-limit': 'int',
> + '*x-multifd-threads': 'int'} }
> ##
> # @query-migrate-parameters
> #
> --
> 2.7.4
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [RFC 00/13] Multifd v2, Juan Quintela, 2016/10/21
- [Qemu-devel] [PATCH 02/13] migration: [HACK] Don't create decompression threads if not enabled, Juan Quintela, 2016/10/21
- [Qemu-devel] [PATCH 03/13] migration: Add multifd capability, Juan Quintela, 2016/10/21
- [Qemu-devel] [PATCH 04/13] migration: Create x-multifd-threads parameter, Juan Quintela, 2016/10/21
- [Qemu-devel] [PATCH 01/13] migration: create Migration Incoming State at init time, Juan Quintela, 2016/10/21
- [Qemu-devel] [PATCH 05/13] migration: create multifd migration threads, Juan Quintela, 2016/10/21
- [Qemu-devel] [PATCH 06/13] migration: Start of multiple fd work, Juan Quintela, 2016/10/21
- [Qemu-devel] [PATCH 07/13] migration: create ram_multifd_page, Juan Quintela, 2016/10/21
- [Qemu-devel] [PATCH 09/13] migration: Send the fd number which we are going to use for this page, Juan Quintela, 2016/10/21
- [Qemu-devel] [PATCH 08/13] migration: Create thread infrastructure for multifd send side, Juan Quintela, 2016/10/21