From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752132AbeBHXgz (ORCPT ); Thu, 8 Feb 2018 18:36:55 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:53380 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751094AbeBHXgy (ORCPT ); Thu, 8 Feb 2018 18:36:54 -0500 Date: Thu, 8 Feb 2018 15:36:52 -0800 From: Andrew Morton To: daniel.m.jordan@oracle.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, aaron.lu@intel.com, ak@linux.intel.com, Dave.Dice@oracle.com, dave@stgolabs.net, khandual@linux.vnet.ibm.com, ldufour@linux.vnet.ibm.com, mgorman@suse.de, mhocko@kernel.org, pasha.tatashin@oracle.com, steven.sistare@oracle.com, yossi.lev@oracle.com Subject: Re: [RFC PATCH v1 00/13] lru_lock scalability Message-Id: <20180208153652.481a77e57cc32c9e1a7e4269@linux-foundation.org> In-Reply-To: <20180131230413.27653-1-daniel.m.jordan@oracle.com> References: <20180131230413.27653-1-daniel.m.jordan@oracle.com> X-Mailer: Sylpheed 3.4.1 (GTK+ 2.24.23; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 31 Jan 2018 18:04:00 -0500 daniel.m.jordan@oracle.com wrote: > lru_lock, a per-node* spinlock that protects an LRU list, is one of the > hottest locks in the kernel. On some workloads on large machines, it > shows up at the top of lock_stat. Do you have details on which callsites are causing the problem? That would permit us to consider other approaches, perhaps.