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

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Message-ID: <ZuAhUHqAA-ejpN3X@gmail.com>
Date: Tue, 10 Sep 2024 12:37:04 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>,
	linux-tip-commits@...r.kernel.org,
	Andrii Nakryiko <andrii@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	"Paul E . McKenney" <paulmck@...nel.org>, bpf <bpf@...r.kernel.org>,
	Jiri Olsa <jolsa@...nel.org>
Subject: Re: [tip: perf/core] uprobes: switch to RCU Tasks Trace flavor for
 better performance


* Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:

> On Thu, Sep 5, 2024 at 8:03 AM tip-bot2 for Andrii Nakryiko
> <tip-bot2@...utronix.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@...nel.org>
> > AuthorDate:    Tue, 03 Sep 2024 10:46:03 -07:00
> > Committer:     Peter Zijlstra <peterz@...radead.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?

Yeah, I'm getting this build failure:

     kernel/events/uprobes.c:1158:9: error: implicit declaration of function ‘synchronize_rcu_tasks_trace’; did you mean ‘synchronize_rcu_tasks’? [-Werror=implicit-function-declaration]

on x86-64 defconfig, when applied to today's perf/core.

Thanks,

	Ingo