Multifd sender thread performs zero page checking. If a page is a zero page, only the page's metadata is sent to the receiver. If a page is a normal page, the entire page's content is sent to the receiver. This change adds a test hook to set the normal page ratio. A zero page will be forced to be sent as a normal page. This is useful for live migration performance analysis and optimization.
Signed-off-by: Hao Xiang <hao.xi...@bytedance.com> --- migration/options.c | 32 ++++++++++++++++++++++++++++++++ migration/options.h | 1 + qapi/migration.json | 18 +++++++++++++++--- 3 files changed, 48 insertions(+), 3 deletions(-) diff --git a/migration/options.c b/migration/options.c index b5f69031a9..aceb391338 100644 --- a/migration/options.c +++ b/migration/options.c @@ -79,6 +79,11 @@ #define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS 5 #define DEFAULT_MIGRATE_ANNOUNCE_STEP 100 +/* + * Parameter for multifd normal page test hook. + */ +#define DEFAULT_MIGRATE_MULTIFD_NORMAL_PAGE_RATIO 101 + #define DEFINE_PROP_MIG_CAP(name, x) \ DEFINE_PROP_BOOL(name, MigrationState, capabilities[x], false) @@ -181,6 +186,9 @@ Property migration_properties[] = { MIG_MODE_NORMAL), DEFINE_PROP_STRING("multifd-dsa-accel", MigrationState, parameters.multifd_dsa_accel), + DEFINE_PROP_UINT8("multifd-normal-page-ratio", MigrationState, + parameters.multifd_normal_page_ratio, + DEFAULT_MIGRATE_MULTIFD_NORMAL_PAGE_RATIO), /* Migration capabilities */ DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), @@ -862,6 +870,12 @@ int migrate_multifd_channels(void) return s->parameters.multifd_channels; } +uint8_t migrate_multifd_normal_page_ratio(void) +{ + MigrationState *s = migrate_get_current(); + return s->parameters.multifd_normal_page_ratio; +} + MultiFDCompression migrate_multifd_compression(void) { MigrationState *s = migrate_get_current(); @@ -1261,6 +1275,14 @@ bool migrate_params_check(MigrationParameters *params, Error **errp) return false; } + if (params->has_multifd_normal_page_ratio && + params->multifd_normal_page_ratio > 100) { + error_setg(errp, QERR_INVALID_PARAMETER_VALUE, + "multifd_normal_page_ratio", + "a value between 0 and 100"); + return false; + } + return true; } @@ -1381,6 +1403,11 @@ static void migrate_params_test_apply(MigrateSetParameters *params, assert(params->multifd_dsa_accel->type == QTYPE_QSTRING); dest->multifd_dsa_accel = params->multifd_dsa_accel->u.s; } + + if (params->has_multifd_normal_page_ratio) { + dest->has_multifd_normal_page_ratio = true; + dest->multifd_normal_page_ratio = params->multifd_normal_page_ratio; + } } static void migrate_params_apply(MigrateSetParameters *params, Error **errp) @@ -1532,6 +1559,11 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp) s->parameters.multifd_dsa_accel = g_strdup(params->multifd_dsa_accel->u.s); } + + if (params->has_multifd_normal_page_ratio) { + s->parameters.multifd_normal_page_ratio = + params->multifd_normal_page_ratio; + } } void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp) diff --git a/migration/options.h b/migration/options.h index 56100961a9..21e3e7b0cf 100644 --- a/migration/options.h +++ b/migration/options.h @@ -95,6 +95,7 @@ const char *migrate_tls_creds(void); const char *migrate_tls_hostname(void); uint64_t migrate_xbzrle_cache_size(void); const char *migrate_multifd_dsa_accel(void); +uint8_t migrate_multifd_normal_page_ratio(void); /* parameters setters */ diff --git a/qapi/migration.json b/qapi/migration.json index 74465bc821..dedcdd076a 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -885,6 +885,9 @@ # characters. Setting this string to an empty string means disabling # DSA accelerator offloading. Defaults to an empty string. (since 8.2) # +# @multifd-normal-page-ratio: Test hook setting the normal page ratio. +# (Since 8.2) +# # Features: # # @deprecated: Member @block-incremental is deprecated. Use @@ -918,7 +921,8 @@ 'block-bitmap-mapping', { 'name': 'x-vcpu-dirty-limit-period', 'features': ['unstable'] }, 'vcpu-dirty-limit', - 'mode'] } + 'mode', + 'multifd-normal-page-ratio'] } ## # @MigrateSetParameters: @@ -1079,6 +1083,9 @@ # characters. Setting this string to an empty string means disabling # DSA accelerator offloading. Defaults to an empty string. (since 8.2) # +# @multifd-normal-page-ratio: Test hook setting the normal page ratio. +# (Since 8.2) +# # Features: # # @deprecated: Member @block-incremental is deprecated. Use @@ -1133,7 +1140,8 @@ 'features': [ 'unstable' ] }, '*vcpu-dirty-limit': 'uint64', '*mode': 'MigMode', - '*multifd-dsa-accel': 'StrOrNull'} } + '*multifd-dsa-accel': 'StrOrNull', + '*multifd-normal-page-ratio': 'uint8'} } ## # @migrate-set-parameters: @@ -1314,6 +1322,9 @@ # characters. Setting this string to an empty string means disabling # DSA accelerator offloading. Defaults to an empty string. (since 8.2) # +# @multifd-normal-page-ratio: Test hook setting the normal page ratio. +# (Since 8.2) +# # Features: # # @deprecated: Member @block-incremental is deprecated. Use @@ -1365,7 +1376,8 @@ 'features': [ 'unstable' ] }, '*vcpu-dirty-limit': 'uint64', '*mode': 'MigMode', - '*multifd-dsa-accel': 'str'} } + '*multifd-dsa-accel': 'str', + '*multifd-normal-page-ratio': 'uint8'} } ## # @query-migrate-parameters: -- 2.30.2