Re: [Qemu-devel] [PATCH 3/5] migration: Print statistics about the number of remaining target pages

[Juan Quintela <quintela@redhat.com>]

Eric Blake <eblake@redhat.com> wrote:
> On 06/01/2017 05:08 PM, Juan Quintela wrote:
>> Signed-off-by: Juan Quintela <quintela@redhat.com>
>> ---
>>  migration/migration.c | 4 +++-
>>  migration/ram.c       | 4 ++--
>>  migration/ram.h       | 2 +-
>>  qapi-schema.json      | 6 +++++-
>>  4 files changed, 11 insertions(+), 5 deletions(-)
>> 
>> diff --git a/migration/migration.c b/migration/migration.c
>> index ea3d41c..2c13217 100644
>> --- a/migration/migration.c
>> +++ b/migration/migration.c
>> @@ -518,7 +518,9 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s)
>>      }
>>  
>>      if (s->state != MIGRATION_STATUS_COMPLETED) {
>> -        info->ram->remaining = ram_bytes_remaining();
>> +        info->ram->remaining_pages = ram_pages_remaining();
>> +        info->ram->remaining = ram_pages_remaining() *
>> +            qemu_target_page_size();
>
> Why not the opposite direction, of:
>
> info->ram->remaining_pages = ram_bytes_remaining() /
> qemu_target_page_size();
> info->ram->remaining = ram_bytes_remaining();
>
> ?
>
>> +++ b/migration/ram.h
>> @@ -41,7 +41,7 @@ uint64_t xbzrle_mig_pages_cache_miss(void);
>>  double xbzrle_mig_cache_miss_rate(void);
>>  uint64_t xbzrle_mig_pages_overflow(void);
>>  uint64_t ram_bytes_transferred(void);
>> -uint64_t ram_bytes_remaining(void);
>> +uint64_t ram_pages_remaining(void);
>>  uint64_t ram_dirty_sync_count(void);
>>  uint64_t ram_dirty_pages_rate(void);
>>  uint64_t ram_postcopy_requests(void);
>
> I know we already have a mishmash of which interfaces are byte-based vs.
> page-based, but using byte-based everywhere seems like a better goal,
> and this feels like we are going backwards from that goal.

Ok, just dropped this bit.

And let the rest of the series the same.

Later, Juan.