From: Thomas Gleixner <tglx@linutronix.de>
To: Sebastian Andrzej Siewior <bigeasy@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
Date: Fri, 28 Sep 2018 21:34:09 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1809282132530.1432@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20180928192630.nvwlwlgswde2fpbq@linutronix.de>
On Fri, 28 Sep 2018, Sebastian Andrzej Siewior wrote:
> 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).
So it was some interaction with rdtsc() which got stored on
stack. Heisenbugs are lovely.
Thanks,
tglx
next prev parent reply other threads:[~2018-09-28 19:34 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 12:02 [Problem] Cache line starvation Sebastian Andrzej Siewior
2018-09-21 12:13 ` Thomas Gleixner
2018-09-21 12:50 ` Sebastian Andrzej Siewior
2018-09-21 12:20 ` Peter Zijlstra
2018-09-21 12:54 ` Thomas Gleixner
2018-10-03 7:51 ` Catalin Marinas
2018-10-03 8:07 ` Thomas Gleixner
2018-10-03 8:28 ` Peter Zijlstra
2018-10-03 10:43 ` Thomas Gleixner
2018-10-03 8:23 ` Peter Zijlstra
2018-09-26 7:34 ` Peter Zijlstra
2018-09-26 8:04 ` Thomas Gleixner
2018-09-26 12:53 ` Will Deacon
2018-09-27 14:25 ` Kurt Kanzenbach
2018-09-27 14:41 ` Kurt Kanzenbach
2018-09-27 14:47 ` Thomas Gleixner
2018-09-28 9:05 ` Kurt Kanzenbach
2018-09-28 15:26 ` Kurt Kanzenbach
2018-09-28 19:26 ` Sebastian Andrzej Siewior
2018-09-28 19:34 ` Thomas Gleixner [this message]
2018-10-02 6:31 ` Daniel Wagner
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