Re: [PATCH v8] Documentation: userspace-api: Document perf ring buffer mechanism

[Jonathan Corbet]

Leo Yan <leo.yan@xxxxxxxxxx> writes:

> In the Linux perf tool, the ring buffer serves not only as a medium for
> transferring PMU event data but also as a vital mechanism for hardware
> tracing using technologies like Intel PT and Arm CoreSight, etc.
>
> Consequently, the ring buffer mechanism plays a crucial role by ensuring
> high throughput for data transfer between the kernel and user space
> while avoiding excessive overhead caused by the ring buffer itself.
>
> This commit documents the ring buffer mechanism in detail.  It explains
> the implementation of both the regular ring buffer and the AUX ring
> buffer.  Additionally, it covers how these ring buffers support various
> tracing modes and explains the synchronization with memory barriers.
>
> Signed-off-by: Leo Yan <leo.yan@xxxxxxxxxx>
> ---

Applied, thanks.

jon