From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f70.google.com (mail-pg0-f70.google.com [74.125.83.70]) by kanga.kvack.org (Postfix) with ESMTP id 860076B026C for ; Mon, 6 Nov 2017 05:27:33 -0500 (EST) Received: by mail-pg0-f70.google.com with SMTP id l23so12346312pgc.10 for ; Mon, 06 Nov 2017 02:27:33 -0800 (PST) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id q61sor3842423plb.97.2017.11.06.02.27.32 for (Google Transport Security); Mon, 06 Nov 2017 02:27:32 -0800 (PST) Date: Mon, 6 Nov 2017 19:27:26 +0900 From: Sergey Senozhatsky Subject: Re: [v5,22/22] powerpc/mm: Add speculative page fault Message-ID: <20171106102726.GB1298@jagdpanzerIV> References: <1507729966-10660-23-git-send-email-ldufour@linux.vnet.ibm.com> <7ca80231-fe02-a3a7-84bc-ce81690ea051@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Laurent Dufour Cc: kemi , paulmck@linux.vnet.ibm.com, peterz@infradead.org, akpm@linux-foundation.org, kirill@shutemov.name, ak@linux.intel.com, mhocko@kernel.org, dave@stgolabs.net, jack@suse.cz, Matthew Wilcox , benh@kernel.crashing.org, mpe@ellerman.id.au, paulus@samba.org, Thomas Gleixner , Ingo Molnar , hpa@zytor.com, Will Deacon , Sergey Senozhatsky , Andrea Arcangeli , Alexei Starovoitov , linux-kernel@vger.kernel.org, linux-mm@kvack.org, haren@linux.vnet.ibm.com, khandual@linux.vnet.ibm.com, npiggin@gmail.com, bsingharora@gmail.com, Tim Chen , linuxppc-dev@lists.ozlabs.org, x86@kernel.org On (11/02/17 15:11), Laurent Dufour wrote: > On 26/10/2017 10:14, kemi wrote: > > Some regression is found by LKP-tools(linux kernel performance) on this patch series > > tested on Intel 2s/4s Skylake platform. > > The regression result is sorted by the metric will-it-scale.per_process_ops. > > Hi Kemi, > > Thanks for reporting this, I'll try to address it by turning some features > of the SPF path off when the process is monothreaded. make them madvice()-able? not all multi-threaded apps will necessarily benefit of SPF. right? just an idea. -ss -- 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