linux-kernel - Re: [RFC] perf/x86/intel: Export mem events only if there's PEBs support

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Date:   Mon, 13 Aug 2018 11:58:05 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [RFC] perf/x86/intel: Export mem events only if there's PEBs
 support

On Mon, Aug 13, 2018 at 05:48:20PM +0200, Jiri Olsa wrote:
> hi,
> we had some reports that we show mem* events on KVM servers
> where they are not available, this patch hides them if there's
> no PEBs available
> 
> currently on those servers we fail to open mem* events,
> because we can't access LDLAT msr
> 
> however that's not so easy/straight forward to check,
> so I thought we could use check on PEBs instead, which
> needs to be there for mem events as well and seems to
> be enough to check
> 
> thoughts? thanks,
> jirka

Acked-by: Andi Kleen <ak@...ux.intel.com>

-Andi