From: Steven Rostedt <rostedt@goodmis.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Clark Williams <williams@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Jon Masters <jcm@redhat.com>, Daniel Wagner <wagi@monom.org>,
Carsten Emde <C.Emde@osadl.org>
Subject: Re: [RFC][PATCH 4/3] tracing: Add NMI tracing in hwlat detector
Date: Fri, 5 Aug 2016 12:17:06 -0400 [thread overview]
Message-ID: <20160805121706.2766ea1a@gandalf.local.home> (raw)
In-Reply-To: <903851a5-68a6-acaa-6604-c63f6aa11b4c@linutronix.de>
On Fri, 5 Aug 2016 17:40:43 +0200
Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:
> > Ah, this is when we have GENERIC_SCHED_CLOCK, which would break tracing
> > if any arch that has this also has NMIs. Probably need to look at arm64.
>
> arm64 should use the generic code as they don't provide sched_clock()
> (and I doubt they go for the weak jiffy version).
And I'm guessing that arm64 supports NMIs. Is there no NMI safe clock?
I probably need to look at the tracing code. Because you can have the
same issue while tracing in an NMI as well.
-- Steve
next prev parent reply other threads:[~2016-08-05 16:17 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-04 14:57 [RFC][PATCH 0/3] tracing: Add Hardware Latency detector tracer Steven Rostedt
2016-08-04 14:57 ` [RFC][PATCH 1/3] tracing: Added hardware latency tracer Steven Rostedt
2016-08-05 14:25 ` Sebastian Andrzej Siewior
2016-08-05 14:44 ` Steven Rostedt
2016-08-05 15:28 ` Sebastian Andrzej Siewior
2016-08-05 15:36 ` Steven Rostedt
2016-08-04 14:57 ` [RFC][PATCH 2/3] tracing: Add documentation for hwlat_detector tracer Steven Rostedt
2016-08-10 14:12 ` Jon Masters
2016-08-04 14:57 ` [RFC][PATCH 3/3] tracing: Have hwlat trace migrate across tracing_cpumask CPUs Steven Rostedt
2016-08-04 15:30 ` [RFC][PATCH 0/3] tracing: Add Hardware Latency detector tracer Steven Rostedt
2016-08-09 18:15 ` Clark Williams
2016-08-09 18:30 ` Steven Rostedt
2016-08-04 16:56 ` [RFC][PATCH 4/3] tracing: Add NMI tracing in hwlat detector Steven Rostedt
2016-08-04 17:16 ` Steven Rostedt
2016-08-05 14:35 ` Sebastian Andrzej Siewior
2016-08-05 14:52 ` Steven Rostedt
2016-08-05 15:40 ` Sebastian Andrzej Siewior
2016-08-05 16:17 ` Steven Rostedt [this message]
2016-08-09 17:22 ` Steven Rostedt
2016-08-10 14:10 ` Jon Masters
2016-08-09 18:05 ` [RFC][PATCH 5/3] tracing: Add smi counting to HWLAT Steven Rostedt
2016-08-09 18:28 ` Daniel Bristot de Oliveira
2016-08-09 18:35 ` Steven Rostedt
2016-08-09 21:25 ` Peter Zijlstra
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