From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f46.google.com (mail-pa0-f46.google.com [209.85.220.46]) by kanga.kvack.org (Postfix) with ESMTP id D3B1C6B0069 for ; Thu, 23 Oct 2014 06:37:01 -0400 (EDT) Received: by mail-pa0-f46.google.com with SMTP id fa1so835402pad.19 for ; Thu, 23 Oct 2014 03:37:01 -0700 (PDT) Received: from heian.cn.fujitsu.com ([59.151.112.132]) by mx.google.com with ESMTP id yk7si1257577pab.135.2014.10.23.03.36.59 for ; Thu, 23 Oct 2014 03:37:00 -0700 (PDT) Message-ID: <5448DB05.5050803@cn.fujitsu.com> Date: Thu, 23 Oct 2014 18:40:05 +0800 From: Lai Jiangshan MIME-Version: 1.0 Subject: Re: [RFC][PATCH 0/6] Another go at speculative page faults References: <20141020215633.717315139@infradead.org> <20141021162340.GA5508@gmail.com> <20141021170948.GA25964@node.dhcp.inet.fi> <20141021175603.GI3219@twins.programming.kicks-ass.net> In-Reply-To: <20141021175603.GI3219@twins.programming.kicks-ass.net> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Peter Zijlstra Cc: "Kirill A. Shutemov" , Ingo Molnar , torvalds@linux-foundation.org, paulmck@linux.vnet.ibm.com, tglx@linutronix.de, akpm@linux-foundation.org, riel@redhat.com, mgorman@suse.de, oleg@redhat.com, mingo@redhat.com, minchan@kernel.org, kamezawa.hiroyu@jp.fujitsu.com, viro@zeniv.linux.org.uk, dave@stgolabs.net, linux-kernel@vger.kernel.org, linux-mm@kvack.org On 10/22/2014 01:56 AM, Peter Zijlstra wrote: > On Tue, Oct 21, 2014 at 08:09:48PM +0300, Kirill A. Shutemov wrote: >> It would be interesting to see if the patchset affects non-condended case. >> Like a one-threaded workload. > > It does, and not in a good way, I'll have to look at that... :/ Maybe it is blamed to find_vma_srcu() that it doesn't take the advantage of the vmacache_find() and cause more cache-misses. Is it hard to use the vmacache in the find_vma_srcu()? > > Performance counter stats for './multi-fault 1' (5 runs): > > 73,860,251 page-faults ( +- 0.28% ) > 40,914 cache-misses ( +- 41.26% ) > > 60.001484913 seconds time elapsed ( +- 0.00% ) > > > Performance counter stats for './multi-fault 1' (5 runs): > > 70,700,838 page-faults ( +- 0.03% ) > 31,466 cache-misses ( +- 8.62% ) > > 60.001753906 seconds time elapsed ( +- 0.00% ) > . > -- 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