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From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
	Amy Wiles <amy.l.wiles@intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	jacob.jun.pan@linux.intel.com
Subject: Re: [PATCH] x86/rapl: Do not load in a guest
Date: Fri, 4 Dec 2015 09:51:02 -0800	[thread overview]
Message-ID: <20151204095102.768764b9@icelake> (raw)
In-Reply-To: <20151204082256.GC17308@twins.programming.kicks-ass.net>

On Fri, 4 Dec 2015 09:22:56 +0100
Peter Zijlstra <peterz@infradead.org> wrote:

> Also, yuck @ powercap/intel_rapl.c for doing rdmsr_on_cpu() +
> wrmsr_on_cpu() all over the place.
Can you please be more specific? is the concern related to the
overhead of IPI? I am doing these calls based on MSR CPU scope and
consider the fact that access is less frequent.

Thanks,

Jacob

  parent reply	other threads:[~2015-12-04 17:52 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-03 18:27 [PATCH] x86/rapl: Do not load in a guest Borislav Petkov
2015-12-03 18:38 ` Jacob Pan
2015-12-03 18:42   ` Borislav Petkov
2015-12-03 18:59     ` Jacob Pan
2015-12-03 23:32       ` Rafael J. Wysocki
2015-12-03 23:25         ` Borislav Petkov
2015-12-04  1:00           ` Rafael J. Wysocki
2015-12-04  7:42 ` Ingo Molnar
2015-12-04  8:22   ` Peter Zijlstra
2015-12-04  8:28     ` Ingo Molnar
2015-12-04 10:19       ` Borislav Petkov
2015-12-04 10:41         ` Paolo Bonzini
2015-12-04 10:56           ` Borislav Petkov
2015-12-04 11:53             ` Ingo Molnar
2015-12-04 17:46               ` Jacob Pan
2015-12-04 17:52                 ` Paolo Bonzini
2015-12-04 18:04                 ` Borislav Petkov
2015-12-04 18:16                   ` Jacob Pan
2015-12-04 18:28                     ` Borislav Petkov
2015-12-04 18:37                       ` Jacob Pan
2015-12-04 19:41                         ` Borislav Petkov
2015-12-04 17:51     ` Jacob Pan [this message]
2015-12-04 22:14       ` Peter Zijlstra
2015-12-04 22:39         ` H. Peter Anvin

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