Re: [tip: perf/core] uprobes: switch to RCU Tasks Trace flavor for better performance

Andrii Nakryiko
2024-09-09T01:11:16Z

On Thu, Sep 5, 2024 at 8:03 AM tip-bot2 for Andrii Nakryiko
<tip-bot2@linutronix.de> wrote:
>
> The following commit has been merged into the perf/core branch of tip:
>
> Commit-ID: c4d4569c41f9cda745cfd1d8089ea3d3526bafe5
> Gitweb: https://git.kernel.org/tip/c4d4569c41f9cda745cfd1d8089ea3d3526bafe5
> Author: Andrii Nakryiko <andrii@kernel.org>
> AuthorDate: Tue, 03 Sep 2024 10:46:03 -07:00
> Committer: Peter Zijlstra <peterz@infradead.org>
> CommitterDate: Thu, 05 Sep 2024 16:56:15 +02:00
>

Hm... This commit landed in perf/core, but is gone now (the rest of
patches is still there). Any idea what happened?

> uprobes: switch to RCU Tasks Trace flavor for better performance
>
> This patch switches uprobes SRCU usage to RCU Tasks Trace flavor, which
> is optimized for more lightweight and quick readers (at the expense of
> slower writers, which for uprobes is a fine tradeof) and has better
> performance and scalability with number of CPUs.
>
> Similarly to baseline vs SRCU, we've benchmarked SRCU-based
> implementation vs RCU Tasks Trace implementation.
> …