From 650af8907bd567db914b7ce3a7e9df4c323f4619 Mon Sep 17 00:00:00 2001 From: Balamuruhan S Date: Tue, 12 Jun 2018 14:20:09 +0530 Subject: [PATCH] migration: calculate expected_downtime with ram_bytes_remaining() expected_downtime value is not accurate with dirty_pages_rate * page_size, using ram_bytes_remaining() would yeild it resonable. consider to read the remaining ram just after having updated the dirty pages count later migration_bitmap_sync_range() in migration_bitmap_sync() and reuse the `remaining` field in ram_counters to hold ram_bytes_remaining() for calculating expected_downtime. Reported-by: Michael Roth Signed-off-by: Balamuruhan S Signed-off-by: Laurent Vivier Message-Id: <20180612085009.17594-2-bala24@linux.vnet.ibm.com> Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Dr. David Alan Gilbert --- migration/migration.c | 3 +-- migration/ram.c | 1 + 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 108c3d7142..e1eaa97df4 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -2746,8 +2746,7 @@ static void migration_update_counters(MigrationState *s, * recalculate. 10000 is a small enough number for our purposes */ if (ram_counters.dirty_pages_rate && transferred > 10000) { - s->expected_downtime = ram_counters.dirty_pages_rate * - qemu_target_page_size() / bandwidth; + s->expected_downtime = ram_counters.remaining / bandwidth; } qemu_file_reset_rate_limit(s->to_dst_file); diff --git a/migration/ram.c b/migration/ram.c index 225b201aff..cd5f55117d 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1180,6 +1180,7 @@ static void migration_bitmap_sync(RAMState *rs) RAMBLOCK_FOREACH_MIGRATABLE(block) { migration_bitmap_sync_range(rs, block, 0, block->used_length); } + ram_counters.remaining = ram_bytes_remaining(); rcu_read_unlock(); qemu_mutex_unlock(&rs->bitmap_mutex);