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