From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756724Ab0ANAbL (ORCPT ); Wed, 13 Jan 2010 19:31:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756346Ab0ANAbJ (ORCPT ); Wed, 13 Jan 2010 19:31:09 -0500 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:42198 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752696Ab0ANAbI (ORCPT ); Wed, 13 Jan 2010 19:31:08 -0500 X-SecurityPolicyCheck-FJ: OK by FujitsuOutboundMailChecker v1.3.1 From: KOSAKI Motohiro To: Gleb Natapov Subject: Re: [PATCH v5] add MAP_UNLOCKED mmap flag Cc: kosaki.motohiro@jp.fujitsu.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, akpm@linux-foundation.org In-Reply-To: <20100113093119.GT7549@redhat.com> References: <20100113093119.GT7549@redhat.com> Message-Id: <20100114092845.D719.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.50.07 [ja] Date: Thu, 14 Jan 2010 09:31:03 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > If application does mlockall(MCL_FUTURE) it is no longer possible to mmap > file bigger than main memory or allocate big area of anonymous memory > in a thread safe manner. Sometimes it is desirable to lock everything > related to program execution into memory, but still be able to mmap > big file or allocate huge amount of memory and allow OS to swap them on > demand. MAP_UNLOCKED allows to do that. > > Signed-off-by: Gleb Natapov > --- > > I get reports that people find this useful, so resending. This description is still wrong. It doesn't describe why this patch is useful.