Subj : [$] Device-initiated I/O
To   : All
From : LWN.net
Date : Thu Jun 05 2025 06:40:09

Peer-to-peer DMA (P2PDMA) has been part of
the kernel since the 4.20 release in 2018;
it provides a framework that allows devices to transfer data between themselves
directly, without using system RAM for the transfer.  At the 2025 Linux
Storage, Filesystem, Memory Management, and BPF Summit (LSFMM+BPF), Stephen
Bates led a combined storage, filesystems, and memory-management session on
device-initiated I/O, which is perhaps what P2PDMA is evolving toward.  Two
years ago, he led a session on P2PDMA at the
summit; this year's session was a brief update on P2PDMA with a look
at where it may be heading.

https://lwn.net/Articles/1022718/
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