From mboxrd@z Thu Jan 1 00:00:00 1970 From: Madhavan Srinivasan Subject: Re: [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data for powerpc Date: Tue, 20 May 2014 13:23:03 +0530 Message-ID: <537B09DF.1090906@linux.vnet.ibm.com> References: <1399541296-18810-1-git-send-email-maddy@linux.vnet.ibm.com> <537479E7.90806@linux.vnet.ibm.com> <87wqdik4n5.fsf@rustcorp.com.au> <53797511.1050409@linux.vnet.ibm.com> <20140519164301.eafd3dd288ccb88361ddcfc7@linux-foundation.org> <20140520004429.E660AE009B@blue.fi.intel.com> <87oaythsvk.fsf@rustcorp.com.au> <20140520003201.a2360d5d.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from e28smtp03.in.ibm.com ([122.248.162.3]:48600 "EHLO e28smtp03.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750850AbaETHxP (ORCPT ); Tue, 20 May 2014 03:53:15 -0400 Received: from /spool/local by e28smtp03.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 20 May 2014 13:23:12 +0530 In-Reply-To: <20140520003201.a2360d5d.akpm@linux-foundation.org> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Andrew Morton , Rusty Russell Cc: "Kirill A. Shutemov" , Hugh Dickins , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, x86@kernel.org, benh@kernel.crashing.org, paulus@samba.org, riel@redhat.com, mgorman@suse.de, ak@linux.intel.com, peterz@infradead.org, mingo@kernel.org, dave.hansen@intel.com On Tuesday 20 May 2014 01:02 PM, Andrew Morton wrote: > On Tue, 20 May 2014 15:52:07 +0930 Rusty Russell wrote: > >> "Kirill A. Shutemov" writes: >>> Andrew Morton wrote: >>>> On Mon, 19 May 2014 16:23:07 -0700 (PDT) Hugh Dickins wrote: >>>> >>>>> Shouldn't FAULT_AROUND_ORDER and fault_around_order be changed to be >>>>> the order of the fault-around size in bytes, and fault_around_pages() >>>>> use 1UL << (fault_around_order - PAGE_SHIFT) >>>> >>>> Yes. And shame on me for missing it (this time!) at review. >>>> >>>> There's still time to fix this. Patches, please. >>> >>> Here it is. Made at 3.30 AM, build tested only. >> >> Prefer on top of Maddy's patch which makes it always a variable, rather >> than CONFIG_DEBUG_FS. It's got enough hair as it is. >> > > We're at 3.15-rc5 and this interface should be finalised for 3.16. So > Kirrill's patch is pretty urgent and should come first. > > Well. It's only a debugfs interface at this stage so we are allowed to > change it later, but it's better not to. > My patchset does not change the interface, but uses the current fault around order variable from CONFIG_DEBUG_FS block to allow changes at runtime, instead of having a constant and some cleanup. Thanks for review Regards --Maddy