AM5729: Sharing HeapMem_Handle between processes

Jared Silbermann

Part Number: AM5729

Tool/software:

Hi,

I am currently implementing DSP operations in a similar way to the Big Data IPC example. I am able to successfully execute operations in a single process. However, I now want to run multiple processes that all use the same shared memory region to run operations on a DSP. I believe the key to this is the ability to share a HeapMem_Handle created with HeapMem_create to all my different processes. This will allow them all to allocate memory in the same shared region.

Any advice on the best way to share this HeapMem_Handle object between different linux processes would be greatly appreciated. If this is not the best way to achieve my goal of using the same shared memory pool across different processes I am also open to alternative methods if there is a better suggestion.

Regards,
Jared

over 1 year ago

0 Josue Zamitiz-Ayala over 1 year ago

TI__Mastermind 37926 points

Hello Jared,

I will need some more time to look into your query internally. For now please look into the public documentation:
https://www.ti.com/lit/ug/spruex3v/spruex3v.pdf?ts=1723567353539&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTI-RTOS-PROC

Section 7.8

as well as https://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/sysbios/6_53_02_00/exports/bios_6_53_02_00/docs/cdoc/ti/sysbios/heaps/HeapMem.html#xdoc-desc

Best,

Josue

0 Jared Silbermann over 1 year ago in reply to Josue Zamitiz-Ayala

Prodigy 165 points

Thanks Josue,

I have come across this post:
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/203587/newb-question-how-to-pass-heapmemmp-allocated-pointers-between-cores#accc14a7c843716dfed734f3a03e8d2b6

I believe being able to access the pointer to the buffer in shared memory region will suffice. I have tried to follow the steps outline as such for passing buffers between different processes both on ARM side.

In one program I create the memory and do all the correct setup for SharedMemory and HeapMem. I then print the shared pointer address:

id = SharedRegion_getId(addr); 
srptr = SharedRegion_getSRPtr(addr, id);

Shared Ptr Addr: 0x40000080

In another program:

 SharedRegion_SRPtr srptr1 = (SharedRegion_SRPtr) 0x40000080;
 Ptr addr1 = SharedRegion_getPtr(srptr1);

The address does not translate and addr1 is the same as srptr1.

If this is not the best way to achieve my goal I am open to suggestions. Ideally I would be able to access the HeapMem_Handle so multiple different processes can manage the memory.

Appreciate the help

Jared

0 Josue Zamitiz-Ayala over 1 year ago in reply to Jared Silbermann

TI__Mastermind 37926 points

Hello Jared,

I am out of office today, so please expect a 1-2 day delay in response.

-Josue

0 Josue Zamitiz-Ayala over 1 year ago in reply to Josue Zamitiz-Ayala

TI__Mastermind 37926 points

Hello Jared,

Remind me what SDK version you are using?

0 Jared Silbermann over 1 year ago in reply to Josue Zamitiz-Ayala

Prodigy 165 points

Hi Josue,

I am using AM57X 06_03_00_106

Thanks

0 Josue Zamitiz-Ayala over 1 year ago in reply to Jared Silbermann

TI__Mastermind 37926 points

Hello Jared,

I am not sure that this is supported. Quote from a colleague:

" HeapMem stack usage on A72 requires symmetric stack usage, which would be IPC 3.x on the RTOS-side and SysLink on the Linux-side. TI has not supported SysLink on AM57xx, it is all rpmsg."

"big data example is dma-buf-heaps or CMEM, which is a Linux centrix allocator, rather than a shared-memory allocator"

-Josue

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AM5729: Sharing HeapMem_Handle between processes