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From 1c9e86aac83e91498772885f5223e212337a3ff9 Mon Sep 17 00:00:00 2001
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From: Laurent Vivier <lvivier@redhat.com>
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Date: Thu, 21 Jun 2018 09:45:26 +0200
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Subject: [PATCH 075/268] migration: calculate expected_downtime with
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ram_bytes_remaining()
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RH-Author: Laurent Vivier <lvivier@redhat.com>
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Message-id: <20180621094526.5714-1-lvivier@redhat.com>
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Patchwork-id: 80931
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH] migration: calculate expected_downtime with ram_bytes_remaining()
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Bugzilla: 1564576
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: David Gibson <dgibson@redhat.com>
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From: Balamuruhan S <bala24@linux.vnet.ibm.com>
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expected_downtime value is not accurate with dirty_pages_rate * page_size,
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using ram_bytes_remaining() would yeild it resonable.
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consider to read the remaining ram just after having updated the dirty
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pages count later migration_bitmap_sync_range() in migration_bitmap_sync()
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and reuse the `remaining` field in ram_counters to hold ram_bytes_remaining()
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for calculating expected_downtime.
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Reported-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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Signed-off-by: Balamuruhan S <bala24@linux.vnet.ibm.com>
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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
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Message-Id: <20180612085009.17594-2-bala24@linux.vnet.ibm.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 650af8907bd567db914b7ce3a7e9df4c323f4619)
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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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migration/migration.c | 3 +--
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migration/ram.c | 1 +
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2 files changed, 2 insertions(+), 2 deletions(-)
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diff --git a/migration/migration.c b/migration/migration.c
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index ef4bb42..43d8a64 100644
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--- a/migration/migration.c
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+++ b/migration/migration.c
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@@ -2239,8 +2239,7 @@ static void migration_update_counters(MigrationState *s,
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* recalculate. 10000 is a small enough number for our purposes
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*/
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if (ram_counters.dirty_pages_rate && transferred > 10000) {
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- s->expected_downtime = ram_counters.dirty_pages_rate *
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- qemu_target_page_size() / bandwidth;
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+ s->expected_downtime = ram_counters.remaining / bandwidth;
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}
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qemu_file_reset_rate_limit(s->to_dst_file);
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diff --git a/migration/ram.c b/migration/ram.c
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index 0e90efa..00c06b5 100644
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--- a/migration/ram.c
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+++ b/migration/ram.c
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@@ -852,6 +852,7 @@ static void migration_bitmap_sync(RAMState *rs)
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RAMBLOCK_FOREACH(block) {
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migration_bitmap_sync_range(rs, block, 0, block->used_length);
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}
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+ ram_counters.remaining = ram_bytes_remaining();
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rcu_read_unlock();
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qemu_mutex_unlock(&rs->bitmap_mutex);
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--
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1.8.3.1
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