[PULL 10/25] migration: Extend query-migrate to provide dirty page limit info

From: Hyman Huang(黄勇) <yong.huang(a)smartx.com&gt; Extend query-migrate to provide throttle time and estimated ring full time with dirty-limit capability enabled, through which we can observe if dirty limit take effect during live migration. Signed-off-by: Hyman Huang(黄勇) <yong.huang(a)smartx.com&gt; Reviewed-by: Markus Armbruster <armbru(a)redhat.com&gt; Reviewed-by: Juan Quintela <quintela(a)redhat.com&gt; Message-ID: <168733225273.5845.15871826788879741674-8(a)git.sr.ht&gt; Signed-off-by: Juan Quintela <quintela(a)redhat.com&gt; --- qapi/migration.json | 16 +++++++++++++- include/sysemu/dirtylimit.h | 2 ++ migration/migration-hmp-cmds.c | 10 +++++++++ migration/migration.c | 10 +++++++++ softmmu/dirtylimit.c | 39 ++++++++++++++++++++++++++++++++++ 5 files changed, 76 insertions(+), 1 deletion(-) diff --git a/qapi/migration.json b/qapi/migration.json index e094438d74..440660bced 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -250,6 +250,18 @@ # blocked. Present and non-empty when migration is blocked. # (since 6.0) # +# @dirty-limit-throttle-time-per-round: Maximum throttle time (in microseconds) of virtual +# CPUs each dirty ring full round, which shows how +# MigrationCapability dirty-limit affects the guest +# during live migration. (since 8.1) +# +# @dirty-limit-ring-full-time: Estimated average dirty ring full time (in microseconds) +# each dirty ring full round, note that the value equals +# dirty ring memory size divided by average dirty page rate +# of virtual CPU, which can be used to observe the average +# memory load of virtual CPU indirectly. Note that zero +# means guest doesn't dirty memory (since 8.1) +# # Since: 0.14 ## { 'struct': 'MigrationInfo', @@ -267,7 +279,9 @@ '*postcopy-blocktime': 'uint32', '*postcopy-vcpu-blocktime': ['uint32'], '*compression': 'CompressionStats', - '*socket-address': ['SocketAddress'] } } + '*socket-address': ['SocketAddress'], + '*dirty-limit-throttle-time-per-round': 'uint64', + '*dirty-limit-ring-full-time': 'uint64'} } ## # @query-migrate: diff --git a/include/sysemu/dirtylimit.h b/include/sysemu/dirtylimit.h index 8d2c1f3a6b..d11ebbbbdb 100644 --- a/include/sysemu/dirtylimit.h +++ b/include/sysemu/dirtylimit.h @@ -34,4 +34,6 @@ void dirtylimit_set_vcpu(int cpu_index, void dirtylimit_set_all(uint64_t quota, bool enable); void dirtylimit_vcpu_execute(CPUState *cpu); +uint64_t dirtylimit_throttle_time_per_round(void); +uint64_t dirtylimit_ring_full_time(void); #endif diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c index 35e8020bbf..c115ef2d23 100644 --- a/migration/migration-hmp-cmds.c +++ b/migration/migration-hmp-cmds.c @@ -190,6 +190,16 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict) info->cpu_throttle_percentage); } + if (info->has_dirty_limit_throttle_time_per_round) { + monitor_printf(mon, "dirty-limit throttle time: %" PRIu64 " us\n", + info->dirty_limit_throttle_time_per_round); + } + + if (info->has_dirty_limit_ring_full_time) { + monitor_printf(mon, "dirty-limit ring full time: %" PRIu64 " us\n", + info->dirty_limit_ring_full_time); + } + if (info->has_postcopy_blocktime) { monitor_printf(mon, "postcopy blocktime: %u\n", info->postcopy_blocktime); diff --git a/migration/migration.c b/migration/migration.c index 49332251e8..1ea7512291 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -64,6 +64,7 @@ #include "yank_functions.h" #include "sysemu/qtest.h" #include "options.h" +#include "sysemu/dirtylimit.h" static NotifierList migration_state_notifiers = NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); @@ -974,6 +975,15 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s) info->ram->dirty_pages_rate = stat64_get(&mig_stats.dirty_pages_rate); } + + if (migrate_dirty_limit() && dirtylimit_in_service()) { + info->has_dirty_limit_throttle_time_per_round = true; + info->dirty_limit_throttle_time_per_round = + dirtylimit_throttle_time_per_round(); + + info->has_dirty_limit_ring_full_time = true; + info->dirty_limit_ring_full_time = dirtylimit_ring_full_time(); + } } static void populate_disk_info(MigrationInfo *info) diff --git a/softmmu/dirtylimit.c b/softmmu/dirtylimit.c index a6d854d161..3c275ee55b 100644 --- a/softmmu/dirtylimit.c +++ b/softmmu/dirtylimit.c @@ -565,6 +565,45 @@ out: hmp_handle_error(mon, err); } +/* Return the max throttle time of each virtual CPU */ +uint64_t dirtylimit_throttle_time_per_round(void) +{ + CPUState *cpu; + int64_t max = 0; + + CPU_FOREACH(cpu) { + if (cpu->throttle_us_per_full > max) { + max = cpu->throttle_us_per_full; + } + } + + return max; +} + +/* + * Estimate average dirty ring full time of each virtaul CPU. + * Return 0 if guest doesn't dirty memory. + */ +uint64_t dirtylimit_ring_full_time(void) +{ + CPUState *cpu; + uint64_t curr_rate = 0; + int nvcpus = 0; + + CPU_FOREACH(cpu) { + if (cpu->running) { + nvcpus++; + curr_rate += vcpu_dirty_rate_get(cpu->cpu_index); + } + } + + if (!curr_rate || !nvcpus) { + return 0; + } + + return dirtylimit_dirty_ring_full_time(curr_rate / nvcpus); +} + static struct DirtyLimitInfo *dirtylimit_query_vcpu(int cpu_index) { DirtyLimitInfo *info = NULL; -- 2.40.1