linux-kernel - Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM

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Message-ID: <20160602160704.GS22049@tassilo.jf.intel.com>
Date:	Thu, 2 Jun 2016 09:07:04 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	David Carrillo-Cisneros <davidcc@...gle.com>
Cc:	linux-kernel@...r.kernel.org, "x86@...nel.org" <x86@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>,
	Kan Liang <kan.liang@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/3] perf/x86/intel: fix for MSR_LAST_BRANCH_FROM_x quirk
 when no TSX

>   $ ./lbr_perf record --call-graph lbr -e cycles:k ./cqm_easy
> 
> where lbr_perf is the patched perf tool, that allows to specify :k
> on lbr mode. The above command will trigger a #GPF :

Why would you want to do that? We usually have frame pointers for
the kernel, so callstack LBR for the kernel is pointless.

-Andi