Re: [PATCH] MAINTAINERS: add RELAY entry

[Jens Axboe]

On 2/28/26 7:09 PM, Jason Xing wrote:
> From: Jason Xing <kernelxing@xxxxxxxxxxx>
> 
> RELAYFS was originally developed by Tom Zanussi and Karim
> Yaghmour in 2005[1]. Jens Axboe converted it from filesystem
> into a generic API in 2006[2] and made it widely known through
> the notable I/O tracing tool blktrace. In the decade, there remain
> a few users scatterred across different subsystems, like recently
> added wifi commit[3] that is an example to show how to communicate
> between users and kernel. Last year I've already done some
> maintenance and added/corrected some diagnostic counters.
> 
> At Tencent, we internally maintain RELAY as one of most crucial
> components of network observibility platform which was shared a
> bit at LPC 2025[4][5] and hopefully will be published in the paper
> this year. RELAY has proven highly efficient due to its inherent
> design essence. This design becomes the indispensable way to build
> a 7x24 platform monitoring various hot paths even without any
> selectively sampling (yes, sampling is commonly used to avoid the
> overall performance degradation). One of the recommended usages is
> use its zerocopy function relay_reserve() to transfer data in a
> raw format that can be recognized and parsed by the corresponding
> application to userspace without introducing heavy locks and
> complicated logic that appears in other types of approaches, like
> printk. More details can be discovered by reading through the
> Documentation :)
> 
> Credits are given to the all the contributors and reviewers for
> RELAY/RELAYFS in the past and future! Many thanks!
> 
> [1]: commit e82894f84dbb ("[PATCH] relayfs")
> [2]: commit b86ff981a825 ("[PATCH] relay: migrate from relayfs to
> a generic relay API")
> [3]: commit c1bf6959dd81 ("wifi: ath11k: Register relayfs entries
> for CFR dump")
> [4]: https://lpc.events/event/19/contributions/2055/
> [5]: https://lpc.events/event/19/contributions/2010/
> 
> Acked-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Jason Xing <kernelxing@xxxxxxxxxxx>
> ---
>  MAINTAINERS | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index b8d8a5c41597..5d751760136c 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -22283,6 +22283,16 @@ L:	linux-wireless@xxxxxxxxxxxxxxx
>  S:	Orphan
>  F:	drivers/net/wireless/rsi/
>  
> +RELAY
> +M:	Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> +M:	Jens Axboe <axboe@xxxxxxxxx>
> +M:	Jason Xing <kernelxing@xxxxxxxxxxx>
> +L:	linux-kernel@xxxxxxxxxxxxxxx
> +S:	Maintained
> +F:	Documentation/filesystems/relay.rst
> +F:	include/linux/relay.h
> +F:	kernel/relay.c
> +
>  REGISTER MAP ABSTRACTION
>  M:	Mark Brown <broonie@xxxxxxxxxx>
>  L:	linux-kernel@xxxxxxxxxxxxxxx

Acked-by: Jens Axboe <axboe@xxxxxxxxx>

-- 
Jens Axboe