From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f49.google.com (mail-pa0-f49.google.com [209.85.220.49]) by kanga.kvack.org (Postfix) with ESMTP id 71A016B006C for ; Thu, 23 Oct 2014 07:04:45 -0400 (EDT) Received: by mail-pa0-f49.google.com with SMTP id hz1so862409pad.22 for ; Thu, 23 Oct 2014 04:04:45 -0700 (PDT) Received: from bombadil.infradead.org (bombadil.infradead.org. [2001:1868:205::9]) by mx.google.com with ESMTPS id el11si1334408pdb.108.2014.10.23.04.04.44 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 23 Oct 2014 04:04:44 -0700 (PDT) Date: Thu, 23 Oct 2014 13:04:38 +0200 From: Peter Zijlstra Subject: Re: [RFC][PATCH 0/6] Another go at speculative page faults Message-ID: <20141023110438.GQ21513@worktop.programming.kicks-ass.net> References: <20141020215633.717315139@infradead.org> <20141021162340.GA5508@gmail.com> <20141021170948.GA25964@node.dhcp.inet.fi> <20141021175603.GI3219@twins.programming.kicks-ass.net> <5448DB05.5050803@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5448DB05.5050803@cn.fujitsu.com> Sender: owner-linux-mm@kvack.org List-ID: To: Lai Jiangshan 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 Thu, Oct 23, 2014 at 06:40:05PM +0800, Lai Jiangshan wrote: > 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. Its what I thought initially, I tried doing perf record with and without, but then I ran into perf diff not quite working for me and I've yet to find time to kick that thing into shape. > Is it hard to use the vmacache in the find_vma_srcu()? I've not had time to look at it. -- 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