netdev - Re: [PATCH RESEND net-next v2] net: devmem: convert binding refcount to percpu

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Message-ID: <20260112180038.0ab231ae@kernel.org>
Date: Mon, 12 Jan 2026 18:00:38 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Bobby Eshleman <bobbyeshleman@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
 <horms@...nel.org>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 Mina Almasry <almasrymina@...gle.com>, Stanislav Fomichev
 <sdf@...ichev.me>, asml.silence@...il.com, Bobby Eshleman
 <bobbyeshleman@...a.com>
Subject: Re: [PATCH RESEND net-next v2] net: devmem: convert binding
 refcount to percpu_ref

On Wed, 07 Jan 2026 17:29:38 -0800 Bobby Eshleman wrote:
> Convert net_devmem_dmabuf_binding refcount from refcount_t to percpu_ref
> to optimize common-case reference counting on the hot path.
> 
> The typical devmem workflow involves binding a dmabuf to a queue
> (acquiring the initial reference on binding->ref), followed by
> high-volume traffic where every skb fragment acquires a reference.
> Eventually traffic stops and the unbind operation releases the initial
> reference. Additionally, the high traffic hot path is often multi-core.
> This access pattern is ideal for percpu_ref as the first and last
> reference during bind/unbind normally book-ends activity in the hot
> path.

Applied, thanks!