From: Ingo Molnar <mingo@kernel.org>
To: Don Zickus <dzickus@redhat.com>
Cc: akpm@linux-foundation.org, kvm@vger.kernel.org,
pbonzini@redhat.com, mingo@redhat.com,
LKML <linux-kernel@vger.kernel.org>,
chai wen <chaiw.fnst@cn.fujitsu.com>
Subject: Re: [PATCH 2/5] softlockup: make detector be aware of task switch of processes hogging cpu
Date: Mon, 18 Aug 2014 21:02:00 +0200 [thread overview]
Message-ID: <20140818190200.GB5074@gmail.com> (raw)
In-Reply-To: <20140818184339.GB49576@redhat.com>
* Don Zickus <dzickus@redhat.com> wrote:
> > > > So I agree with the motivation of this improvement, but
> > > > is this implementation namespace-safe?
> > >
> > > What namespace are you worried about colliding with? I
> > > thought softlockup_ would provide the safety?? Maybe I
> > > am missing something obvious. :-(
> >
> > I meant PID namespaces - a PID in itself isn't guaranteed
> > to be unique across the system.
>
> Ah, I don't think we thought about that. Is there a better
> way to do this? Is there a domain id or something that can
> be OR'd with the pid?
What is always unique is the task pointer itself. We use pids
when we interface with user-space - but we don't really do that
here, right?
Thanks,
Ingo
next prev parent reply other threads:[~2014-08-18 19:02 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-11 14:49 [PATCH 0/5] watchdog: various fixes Don Zickus
2014-08-11 14:49 ` [PATCH 1/5] watchdog: remove unnecessary head files Don Zickus
2014-08-18 18:03 ` [tip:perf/watchdog] watchdog: Remove unnecessary header files tip-bot for chai wen
2014-08-11 14:49 ` [PATCH 2/5] softlockup: make detector be aware of task switch of processes hogging cpu Don Zickus
2014-08-18 9:03 ` Ingo Molnar
2014-08-18 15:06 ` Don Zickus
2014-08-18 18:01 ` Ingo Molnar
2014-08-18 18:43 ` Don Zickus
2014-08-18 19:02 ` Ingo Molnar [this message]
2014-08-18 20:38 ` Don Zickus
2014-08-19 1:36 ` Chai Wen
2014-08-21 1:37 ` Chai Wen
2014-08-21 2:30 ` Don Zickus
2014-08-21 5:42 ` [PATCH] " chai wen
2014-08-22 1:12 ` Chai Wen
2014-08-22 1:58 ` Don Zickus
2014-08-26 12:51 ` Chai Wen
2014-08-26 14:22 ` Don Zickus
2014-08-27 1:33 ` Chai Wen
2014-08-11 14:49 ` [PATCH 3/5] watchdog: fix print-once on enable Don Zickus
2014-08-18 9:05 ` Ingo Molnar
2014-08-18 9:07 ` Ingo Molnar
2014-08-18 15:07 ` Don Zickus
2014-08-18 18:03 ` [tip:perf/watchdog] watchdog: Fix " tip-bot for Ulrich Obergfell
2014-08-11 14:49 ` [PATCH 4/5] watchdog: control hard lockup detection default Don Zickus
2014-08-18 9:12 ` Ingo Molnar
2014-08-18 15:07 ` Don Zickus
2014-08-18 9:16 ` Ingo Molnar
2014-08-18 10:44 ` Ulrich Obergfell
2014-08-18 15:17 ` Don Zickus
2014-08-18 18:07 ` Ingo Molnar
2014-08-18 18:53 ` Don Zickus
2014-08-18 19:00 ` Ingo Molnar
2014-08-11 14:49 ` [PATCH 5/5] kvm: ensure hard lockup detection is disabled by default Don Zickus
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