PMEM memory style API in kernel

[Sumit Dighe]

Hi,

I want to use some memory style API's of PMEM for block device interface in kernel.

can someone help any doc / source code in linux kernel for this?

Thanks,

Sumit

[Sumit Dighe]

Primary purpose is to avoid context switch overhead that is there is traditional BIO mechanism on block device.

Thanks,

Sumit

--

*****Sumit*****

[Andy Rudoff]

Hi Sumit,

I recommend searching for the driver entry point called "direct_access" in the Linux kernel source.  Notice how file systems that support DAX use that entry point to get direct load/store access to pmem.

Also, reading Documentation/filesystems/dax.txt is probably useful.

-andy

[Dan Williams]

On Tue, Nov 26, 2019 at 9:04 AM Sumit Dighe <srdi...@gmail.com> wrote:
>
> Primary purpose is to avoid context switch overhead that is there is traditional BIO mechanism on block device.

DAX already avoids the BIO path. Otherwise, I'm not quite
understanding the question.