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
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