From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f178.google.com (mail-pd0-f178.google.com [209.85.192.178]) by kanga.kvack.org (Postfix) with ESMTP id 9CE056B0035 for ; Fri, 22 Aug 2014 12:45:27 -0400 (EDT) Received: by mail-pd0-f178.google.com with SMTP id w10so16310490pde.9 for ; Fri, 22 Aug 2014 09:45:27 -0700 (PDT) Received: from blackbird.sr71.net (www.sr71.net. [198.145.64.142]) by mx.google.com with ESMTP id pm7si41639137pac.51.2014.08.22.09.45.25 for ; Fri, 22 Aug 2014 09:45:25 -0700 (PDT) Message-ID: <53F773A2.7040904@sr71.net> Date: Fri, 22 Aug 2014 09:45:22 -0700 From: Dave Hansen MIME-Version: 1.0 Subject: Re: [PATCH] [v3] warn on performance-impacting configs aka. TAINT_PERFORMANCE References: <20140821202424.7ED66A50@viggo.jf.intel.com> <1408725157.4347.14.camel@schen9-DESK> In-Reply-To: <1408725157.4347.14.camel@schen9-DESK> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Tim Chen Cc: linux-kernel@vger.kernel.org, dave.hansen@linux.intel.com, peterz@infradead.org, mingo@redhat.com, ak@linux.intel.com, akpm@linux-foundation.org, cl@linux.com, penberg@kernel.org, linux-mm@kvack.org, kirill@shutemov.name, lauraa@codeaurora.org On 08/22/2014 09:32 AM, Tim Chen wrote: >> > +#ifdef CONFIG_DEBUG_OBJECTS_FREE >> > + "DEBUG_OBJECTS_FREE", >> > +#endif >> > +#ifdef CONFIG_DEBUG_KMEMLEAK >> > + "DEBUG_KMEMLEAK", >> > +#endif >> > +#ifdef CONFIG_DEBUG_PAGEALLOC >> > + "DEBUG_PAGEALLOC", > I think coverage profiling also impact performance. > So I sould also put CONFIG_GCOV_KERNEL in the list. Would CONFIG_GCOV_PROFILE_ALL be the better one to check? With plain GCOV_KERNEL, I don't think we will, by default, put the coverage information in any files and slow them down. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org