From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753461AbcEWSmv (ORCPT ); Mon, 23 May 2016 14:42:51 -0400 Received: from mail-wm0-f68.google.com ([74.125.82.68]:34500 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750710AbcEWSms (ORCPT ); Mon, 23 May 2016 14:42:48 -0400 Date: Mon, 23 May 2016 20:42:46 +0200 From: Michal Hocko To: Ebru Akagunduz Cc: linux-mm@kvack.org, hughd@google.com, riel@redhat.com, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, n-horiguchi@ah.jp.nec.com, aarcange@redhat.com, iamjoonsoo.kim@lge.com, gorcunov@openvz.org, linux-kernel@vger.kernel.org, mgorman@suse.de, rientjes@google.com, vbabka@suse.cz, aneesh.kumar@linux.vnet.ibm.com, hannes@cmpxchg.org, boaz@plexistor.com Subject: Re: [PATCH 3/3] mm, thp: make swapin readahead under down_read of mmap_sem Message-ID: <20160523184246.GE32715@dhcp22.suse.cz> References: <1464023651-19420-1-git-send-email-ebru.akagunduz@gmail.com> <1464023651-19420-4-git-send-email-ebru.akagunduz@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1464023651-19420-4-git-send-email-ebru.akagunduz@gmail.com> User-Agent: Mutt/1.6.0 (2016-04-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon 23-05-16 20:14:11, Ebru Akagunduz wrote: > Currently khugepaged makes swapin readahead under > down_write. This patch supplies to make swapin > readahead under down_read instead of down_write. You are still keeping down_write. Can we do without it altogether? Blocking mmap_sem of a remote proces for write is certainly not nice. -- Michal Hocko SUSE Labs