Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Fri, 28 Sep 2018 21:26:30 +0200
From:   Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Kurt Kanzenbach <kurt.kanzenbach@linutronix.de>,
        Will Deacon <will.deacon@arm.com>,
        linux-kernel@vger.kernel.org,
        Daniel Wagner <daniel.wagner@siemens.com>,
        Peter Zijlstra <peterz@infradead.org>, x86@kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Boqun Feng <boqun.feng@gmail.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Mark Rutland <mark.rutland@arm.com>
Subject: Re: [Problem] Cache line starvation
Message-ID: <20180928192630.nvwlwlgswde2fpbq@linutronix.de>
References: <20180921120226.6xjgr4oiho22ex75@linutronix.de>
 <20180926125301.GE2979@brain-police>
 <20180927142547.ucgh5elb7pxs46dq@linutronix.de>
 <20180927144127.qdkem4juhztxdkdb@linutronix.de>
 <alpine.DEB.2.21.1809271644120.8118@nanos.tec.linutronix.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <alpine.DEB.2.21.1809271644120.8118@nanos.tec.linutronix.de>
User-Agent: NeoMutt/20180716
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 2018-09-27 16:47:47 [+0200], Thomas Gleixner wrote:
> I wonder if it's just the store on the stack which makes it work. I've seen
> that when instrumenting x86. When the careful instrumentation just stayed
> in registers it failed. Once it was too much and stack got involved it
> vanished away.

Added two load/stores into wait_task_inactive() and it still triggers
(on the core2duo).

> Thanks,
> 
> 	tglx

Sebastian