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Date:   Fri, 15 Oct 2021 10:52:33 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Norbert <nbrtt01@gmail.com>
Cc:     linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Performance regression: thread wakeup time (latency) increased
 up to 3x
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References: <035c23b4-118e-6a35-36d9-1b11e3d679f8@gmail.com>
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On Fri, Oct 15, 2021 at 12:43:45AM -0700, Norbert wrote:
> Performance regression: thread wakeup time (latency) increased up to 3x.
> 
> Happened between 5.13.8 and 5.14.0. Still happening at least on 5.14.11.

Could you git-bisect this?