On Tuesday, March 29, 2011 16:01:33 Willy POISSON wrote: > Hi all, > Following to the Warsaw mini-summit action point, I would like to open the thread to gather buffer pool & memory manager requirements. > The list of requirement for buffer pool may contain: > - Support physically contiguous and virtual memory > - Support IPC, import/export handles (between processes/drivers/userland/etc) > - Security(access rights in order to secure no one unauthorized is allowed to access buffers) > - Cache flush management (by using setdomain and optimize when flushing is needed) > - Pin/unpin in order to get the actual address to be able to do defragmentation > - Support pinning in user land in order to allow defragmentation while buffer is mmapped but not pined. > - Both a user API and a Kernel API is needed for this module. (Kernel drivers needs to be able to resolve buffer handles as well from the memory manager module, and pin/unpin) > - be able to support any platform specific allocator (Separate memory allocation from management as allocator is platform dependant) > - Support multiple region domain (Allow to allocate from several memory domain ex: DDR1, DDR2, Embedded SRAM to make for ex bandwidth load balancing ...) Thanks for your input, Willy! I have one question: do you know which of the points mentioned above are implemented in actual existing code that ST-Ericsson uses? Ideally with links to such code as well if available :-) That will help as a reference. > Another idea, but not so linked to memory management (more usage of buffers), would be to have a common data container (structure to access data) shared by several media (Imaging, video/still codecs, graphics, Display...) to ease usage of the data. This container could embed data type (video frames, Access Unit) , frames format, pixel format, width, height, pixel aspect ratio, region of interest, CTS (composition time stamp), ColorSpace, transparency (opaque, alpha, color key...), pointer on buffer(s) handle)... Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
