From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
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>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: [RFC][PATCH 5/3] tracing: Add smi counting to HWLAT
Date: Tue, 9 Aug 2016 23:25:58 +0200 [thread overview]
Message-ID: <20160809212558.GJ30192@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160809140543.2e5c83b5@gandalf.local.home>
On Tue, Aug 09, 2016 at 02:05:43PM -0400, Steven Rostedt wrote:
> +int arch_smi_count(void)
> +{
> + unsigned long long count;
> + int err;
> +
> + err = rdmsrl_safe(MSR_SMI_COUNT, &count);
> + if (err)
> + return 0;
That's really yucky, relying on _safe() to detect availability.
Also, I just found AMD Fam15h has this counter through PMCs (event
0x2b).
> +
> + return count;
> +}
prev parent reply other threads:[~2016-08-09 21:26 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
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 [this message]
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