From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751667AbbINVd6 (ORCPT ); Mon, 14 Sep 2015 17:33:58 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:47759 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750980AbbINVd5 (ORCPT ); Mon, 14 Sep 2015 17:33:57 -0400 Date: Mon, 14 Sep 2015 14:33:55 -0700 From: Andrew Morton To: Ebru Akagunduz Cc: linux-mm@kvack.org, kirill.shutemov@linux.intel.com, n-horiguchi@ah.jp.nec.com, aarcange@redhat.com, riel@redhat.com, iamjoonsoo.kim@lge.com, xiexiuqi@huawei.com, gorcunov@openvz.org, linux-kernel@vger.kernel.org, mgorman@suse.de, rientjes@google.com, vbabka@suse.cz, aneesh.kumar@linux.vnet.ibm.com, hughd@google.com, hannes@cmpxchg.org, mhocko@suse.cz, boaz@plexistor.com, raindel@mellanox.com Subject: Re: [RFC v5 2/3] mm: make optimistic check for swapin readahead Message-Id: <20150914143355.cd75506c0605c5d6c9a4bb03@linux-foundation.org> In-Reply-To: <1442259105-4420-3-git-send-email-ebru.akagunduz@gmail.com> References: <1442259105-4420-1-git-send-email-ebru.akagunduz@gmail.com> <1442259105-4420-3-git-send-email-ebru.akagunduz@gmail.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 Mon, 14 Sep 2015 22:31:44 +0300 Ebru Akagunduz wrote: > This patch introduces new sysfs integer knob > /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_swap > which makes optimistic check for swapin readahead to > increase thp collapse rate. Before getting swapped > out pages to memory, checks them and allows up to a > certain number. It also prints out using tracepoints > amount of unmapped ptes. We we please get this control documented? Documentation/vm/transhuge.txt appears to be the place for it.