diff options
| author | Balamuruhan S <bala24@linux.vnet.ibm.com> | 2018-06-12 14:20:09 +0530 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2018-06-15 14:40:56 +0100 |
| commit | 650af8907bd567db914b7ce3a7e9df4c323f4619 (patch) | |
| tree | 466b4c04d552844ffdb8f88923572976ae999378 | |
| parent | e03a34f8f36e3b357d7a0c38e881fe183727b7ef (diff) | |
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 <mdroth@linux.vnet.ibm.com>
Signed-off-by: Balamuruhan S <bala24@linux.vnet.ibm.com>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20180612085009.17594-2-bala24@linux.vnet.ibm.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
| -rw-r--r-- | migration/migration.c | 3 | ||||
| -rw-r--r-- | 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); |