extn_data_size is not equal to extn_data_off,
current class data size and data offset must be substracted first
elementary_test bubble peak usage goes from 13.7 MiB to 12.5 MiB
- to enable this feature, compile with --with-profile=debug
- the mid tables and tables are write protected after modifications,
you will segfault if you mess with them
- because of mmap PAGE_SIZE alignement and added magic header, almost a
memory page is wasted per table and mid table allocation.
- reducing the number of tables per mid table and the number of entries
per table solves this.
- pack active flag and generation nbr in an _Eo_Id_Entry struct
- replace Eina_Trash with a fifo which lives in mmaped memory owned by eo_id.
- fifo uses indexes instead of pointers to spare memory
- never used entries are served first, then those in the fifo
are reused, thus we ensure that a freed entry won't soon be reused.
We want to introduce a new mechanism concerning the data of the Eo
objects.
The goal is to improve the memory management by defragmenting the memory
banks used by the Eo objects. The first phase has been done by raster
and consists in allocating the objects into a separate memory region
that the one used by malloc. So now, we know where our objects are
located.
Now, moving objects means moving data of objects. The issue we have here
is that a lot of data pointers are stored into data of other objects,
e.g Evas Object data into lists for rendering...
We need a way to reference the data and eo_data_get doesn't provide us
that. So we need to improve the API for data extraction by requesting
from the developer if the data will be stored or not. Five functions are
supplied:
- eo_data_scope_get: no referencing, the data pointer is no more used after
exiting the function.
- eo_data_ref: reference the data of the object. It means that while the
data is referenced, the object cannot be moved.
- eo_data_xref: reference the data of the object but for debug purpose,
we associate the objects that references. Same behavior as eo_data_ref
for non-debug.
- eo_data_unref: unreference the data of an object.
- eo_data_xunref: unreference the data of an object previously
referenced by another object.
I deprecated the eo_data_get function. Most of the time,
eo_data_scope_get needs to be used.
In the next patches, I changed the eo_data_get to the corresponding
functions, according to the usage of the data pointer.
The next step is to find all the places in the code where the data is
stored but not yet referenced. This will be done by:
- requesting from every object to unreference all data to other objects.
- moving all the objects from one region to another
- requesting from every object to rerefenrence the data.
- debugging by hunting the segmentation faults and other weird
creatures.
use of an array of the below struct instead of 3 separate arrays
leads to better cache performance and smaller memory usage
typedef struct
{
_Eo *ptr;
unsigned int active : 1;
unsigned int generation : BITS_FOR_GENERATION_COUNTER;
} _Eo_Id_Entry;
Ryuan Choi
Jérémy Zurcher
Cedric Bail
Daniel Zaoui
Tom Hacohen
Stefan Schmidt
Daniel Willmann