[SPDK] Re: Shared memory allocated spdk_dma_malloc from among process

[SPDK] Re: Shared memory allocated spdk_dma_malloc from among process

[Cao, Gang]

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SPDK underlying layer also supports the multi process mode based on DPDK's capability.

You may take a look at https://spdk.io/doc/nvme.html#nvme_multi_process

Also for the usage of spdk_dma_malloc, you may take a look at the multi process related APIs like spdk_memzone... and spdk_mempool... which will also call the rte_memzone... and rte_mempool... APIs.

Thanks.

-----Original Message-----
From: Lego Lin <lego.lin(a)gmail.com> 
Sent: Thursday, October 20, 2022 23:32
To: Storage Performance Development Kit <spdk(a)lists.01.org>
Subject: [SPDK] Shared memory allocated spdk_dma_malloc from among process

Hi, all:

Can anyone give me some guidelines that how to share memory from spdk_dma_malloc among 2 processes?

I know how to use shm_open / mmap to create and share memory among processes.
It looks like DPDK memzone can be shared among processes through it's internal API (rte_memzone_lookup / dump_memzone) But I didn't find obvious clues about sharing memory from spdk_dma_malloc to another process.
My idea is Process A get the physical address of memory from spdk_dma_malloc.
Process A put these physical address to a shared memory.
Process B get physical address from shared memory and map them to virtual space of process B.

Is there other ways to do this?

Thanks
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