From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [103.22.144.67]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 017721A0E44 for ; Thu, 11 Jun 2015 05:17:22 +1000 (AEST) Received: from na01-by2-obe.outbound.protection.outlook.com (mail-by2on0142.outbound.protection.outlook.com [207.46.100.142]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 2407E140297 for ; Thu, 11 Jun 2015 05:17:20 +1000 (AEST) Message-ID: <1433963830.2477.136.camel@freescale.com> Subject: Re: question on FSL_EMB perf From: Scott Wood To: Peter Zijlstra CC: Michael Neuling , Benjamin Herrenschmidt , Date: Wed, 10 Jun 2015 14:17:10 -0500 In-Reply-To: <20150610114126.GN19282@twins.programming.kicks-ass.net> References: <20150610114126.GN19282@twins.programming.kicks-ass.net> Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, 2015-06-10 at 13:41 +0200, Peter Zijlstra wrote: > Hi Mike, Ben, > > I just noticed: > > arch/powerpc/Kconfig: select HAVE_PERF_EVENTS_NMI if PPC64 > > But can't ppc32 have FSL_EMB perf? Yes, but it doesn't use NMIs. ppc64 has lazy interrupt disabling which functions as a pseudo-NMI. -Scott