From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756828Ab2DFAgP (ORCPT ); Thu, 5 Apr 2012 20:36:15 -0400 Received: from forward18.mail.yandex.net ([95.108.253.143]:54381 "EHLO forward18.mail.yandex.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756469Ab2DFAgK (ORCPT ); Thu, 5 Apr 2012 20:36:10 -0400 X-Greylist: delayed 407 seconds by postgrey-1.27 at vger.kernel.org; Thu, 05 Apr 2012 20:36:10 EDT From: Alexey Ivanov To: linux-kernel@vger.kernel.org Subject: mapped pagecache pages vs unmapped pages MIME-Version: 1.0 Message-Id: <37371333672160@webcorp7.yandex-team.ru> Date: Fri, 06 Apr 2012 04:29:20 +0400 X-Mailer: Yamail [ http://yandex.ru ] 5.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In progress of migration from FreeBSD to Linux and we found some strange behavior: periodically running tasks (like rsync/p2p deployment) evict mapped pages from memory. >>From my little research I've found following lkml thread: https://lkml.org/lkml/2008/6/11/278 And more precisely this commit: https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4f98a2fee8acdb4ac84545df98cccecfd130f8db which along with splitting LRU into "anon" and "file" removed support of reclaim_mapped. Is there a knob to prioritize mapped memory over unmapped (without modifying all apps to use O_DIRECT/fadvise/madvise or mlocking our data in memory) or at least some way to change proportion of Active(file)/Inactive(file)? -- Sincerely, Alexey Ivanov