linux-kernel - [PATCH 0/2] Access Rust fields from TP_fast_assign in TRACE

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Message-ID: <20251203-binder-trace1-v1-0-22d3ffddb44e@google.com>
Date: Wed, 03 Dec 2025 14:48:07 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Carlos Llamas <cmllamas@...gle.com>, 
	Steven Rostedt <rostedt@...dmis.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
	Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, "Arve Hjønnevåg" <arve@...roid.com>, Todd Kjos <tkjos@...roid.com>, 
	Martijn Coenen <maco@...roid.com>, Joel Fernandes <joelagnelf@...dia.com>, 
	Christian Brauner <brauner@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, rust-for-linux@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Alice Ryhl <aliceryhl@...gle.com>
Subject: [PATCH 0/2] Access Rust fields from TP_fast_assign in TRACE_EVENT

This patch shows one possible mechanism for accessing Rust fields from
the TP_fast_assign() body of a trace event. The idea is to have the
driver expose the offsets of the relevant fields, and to have the C code
use those offsets to access the data.

I'm currently using this mechanism in the Rust Binder driver on
Android's fork of 6.12.

Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
---
Alice Ryhl (2):
      rust: sync: add Arc::DATA_OFFSET
      rust_binder: add binder_transaction tracepoint

 drivers/android/binder/node.rs              |  8 +++
 drivers/android/binder/process.rs           |  7 +++
 drivers/android/binder/rust_binder.h        | 79 +++++++++++++++++++++++++++++
 drivers/android/binder/rust_binder_events.h | 30 +++++++++++
 drivers/android/binder/rust_binder_main.rs  |  8 +++
 drivers/android/binder/thread.rs            |  1 +
 drivers/android/binder/trace.rs             | 21 ++++++++
 drivers/android/binder/transaction.rs       | 14 +++++
 rust/kernel/sync/arc.rs                     |  3 ++
 9 files changed, 171 insertions(+)
---
base-commit: 211ddde0823f1442e4ad052a2f30f050145ccada
change-id: 20251113-binder-trace1-b2d369f63e30

Best regards,
-- 
Alice Ryhl <aliceryhl@...gle.com>