From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753639AbaEHJ2e (ORCPT ); Thu, 8 May 2014 05:28:34 -0400 Received: from e28smtp06.in.ibm.com ([122.248.162.6]:43299 "EHLO e28smtp06.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753162AbaEHJ2b (ORCPT ); Thu, 8 May 2014 05:28:31 -0400 From: Madhavan Srinivasan To: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, x86@kernel.org Cc: benh@kernel.crashing.org, paulus@samba.org, kirill.shutemov@linux.intel.com, rusty@rustcorp.com.au, akpm@linux-foundation.org, riel@redhat.com, mgorman@suse.de, ak@linux.intel.com, peterz@infradead.org, mingo@kernel.org, dave.hansen@intel.com, Madhavan Srinivasan Subject: [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data for powerpc Date: Thu, 8 May 2014 14:58:14 +0530 Message-Id: <1399541296-18810-1-git-send-email-maddy@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.10.4 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14050809-9574-0000-0000-00000D78B267 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Kirill A. Shutemov with 8c6e50b029 commit introduced vm_ops->map_pages() for mapping easy accessible pages around fault address in hope to reduce number of minor page faults. This patch creates infrastructure to modify the FAULT_AROUND_ORDER value using mm/Kconfig. This will enable architecture maintainers to decide on suitable FAULT_AROUND_ORDER value based on performance data for that architecture. First patch also defaults FAULT_AROUND_ORDER Kconfig element to 4. Second patch list out the performance numbers for powerpc (platform pseries) and initialize the fault around order variable for pseries platform of powerpc. V4 Changes: Replaced the BUILD_BUG_ON with VM_BUG_ON. Moved fault_around_pages() and fault_around_mask() functions outside of #ifdef CONFIG_DEBUG_FS. V3 Changes: Replaced FAULT_AROUND_ORDER macro to a variable to support arch's that supports sub platforms. Made changes in commit messages. V2 Changes: Created Kconfig parameter for FAULT_AROUND_ORDER Added check in do_read_fault to handle FAULT_AROUND_ORDER value of 0 Made changes in commit messages. Madhavan Srinivasan (2): mm: move FAULT_AROUND_ORDER to arch/ powerpc/pseries: init fault_around_order for pseries arch/powerpc/platforms/pseries/pseries.h | 2 ++ arch/powerpc/platforms/pseries/setup.c | 5 +++++ mm/Kconfig | 8 ++++++++ mm/memory.c | 25 ++++++------------------- 4 files changed, 21 insertions(+), 19 deletions(-) -- 1.7.10.4