From ac346634c5731407baa9de709dbd4d5cc6f45301 Mon Sep 17 00:00:00 2001 From: Leonardo Bras Date: Mon, 11 Jul 2022 18:11:12 -0300 Subject: [PATCH 02/11] Add dirty-sync-missed-zero-copy migration stat MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Leonardo Brás RH-MergeRequest: 111: zero-copy-send fixes & improvements RH-Commit: [2/6] 115035fd0a4e4b9439c91fb0f5d1a2f9244ba369 (LeoBras/centos-qemu-kvm) RH-Bugzilla: 2107466 RH-Acked-by: Miroslav Rezanina RH-Acked-by: Thomas Huth RH-Acked-by: Dr. David Alan Gilbert Signed-off-by: Leonardo Bras Acked-by: Markus Armbruster Acked-by: Peter Xu Reviewed-by: Daniel P. Berrangé Message-Id: <20220711211112.18951-3-leobras@redhat.com> Signed-off-by: Dr. David Alan Gilbert (cherry picked from commit cf20c897338067ab4b70a4596fdccaf90c7e29a1) Signed-off-by: Leonardo Bras --- migration/migration.c | 2 ++ monitor/hmp-cmds.c | 5 +++++ qapi/migration.json | 7 ++++++- 3 files changed, 13 insertions(+), 1 deletion(-) diff --git a/migration/migration.c b/migration/migration.c index 8fb3eae910..3a3a7a4a50 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1017,6 +1017,8 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s) info->ram->normal_bytes = ram_counters.normal * page_size; info->ram->mbps = s->mbps; info->ram->dirty_sync_count = ram_counters.dirty_sync_count; + info->ram->dirty_sync_missed_zero_copy = + ram_counters.dirty_sync_missed_zero_copy; info->ram->postcopy_requests = ram_counters.postcopy_requests; info->ram->page_size = page_size; info->ram->multifd_bytes = ram_counters.multifd_bytes; diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c index 634968498b..9cec01de38 100644 --- a/monitor/hmp-cmds.c +++ b/monitor/hmp-cmds.c @@ -305,6 +305,11 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict) monitor_printf(mon, "postcopy ram: %" PRIu64 " kbytes\n", info->ram->postcopy_bytes >> 10); } + if (info->ram->dirty_sync_missed_zero_copy) { + monitor_printf(mon, + "Zero-copy-send fallbacks happened: %" PRIu64 " times\n", + info->ram->dirty_sync_missed_zero_copy); + } } if (info->has_disk) { diff --git a/qapi/migration.json b/qapi/migration.json index 5105790cd0..9b38b3c21c 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -55,6 +55,10 @@ # @postcopy-bytes: The number of bytes sent during the post-copy phase # (since 7.0). # +# @dirty-sync-missed-zero-copy: Number of times dirty RAM synchronization could +# not avoid copying dirty pages. This is between +# 0 and @dirty-sync-count * @multifd-channels. +# (since 7.1) # Since: 0.14 ## { 'struct': 'MigrationStats', @@ -65,7 +69,8 @@ 'postcopy-requests' : 'int', 'page-size' : 'int', 'multifd-bytes' : 'uint64', 'pages-per-second' : 'uint64', 'precopy-bytes' : 'uint64', 'downtime-bytes' : 'uint64', - 'postcopy-bytes' : 'uint64' } } + 'postcopy-bytes' : 'uint64', + 'dirty-sync-missed-zero-copy' : 'uint64' } } ## # @XBZRLECacheStats: -- 2.31.1