From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754844Ab0ANGuS (ORCPT ); Thu, 14 Jan 2010 01:50:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754559Ab0ANGuR (ORCPT ); Thu, 14 Jan 2010 01:50:17 -0500 Received: from mx1.redhat.com ([209.132.183.28]:14986 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751037Ab0ANGuQ (ORCPT ); Thu, 14 Jan 2010 01:50:16 -0500 Date: Thu, 14 Jan 2010 08:50:08 +0200 From: Gleb Natapov To: KOSAKI Motohiro Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, akpm@linux-foundation.org Subject: Re: [PATCH v5] add MAP_UNLOCKED mmap flag Message-ID: <20100114065008.GC18808@redhat.com> References: <20100113093119.GT7549@redhat.com> <20100114092845.D719.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100114092845.D719.A69D9226@jp.fujitsu.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 14, 2010 at 09:31:03AM +0900, KOSAKI Motohiro wrote: > > 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. > I think the text above describes the feature it adds and its use case quite well. Can you elaborate what is missing in your opinion, or suggest alternative text please? -- Gleb.