From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sfi-mx-3.v28.ch3.sourceforge.com ([172.29.28.123] helo=mx.sourceforge.net) by h25xhf1.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1MObUW-0004gu-CA for ltp-list@lists.sourceforge.net; Wed, 08 Jul 2009 18:03:36 +0000 Received: from mail-fx0-f208.google.com ([209.85.220.208]) by 3b2kzd1.ch3.sourceforge.com with esmtp (Exim 4.69) id 1MObUR-0004YM-1U for ltp-list@lists.sourceforge.net; Wed, 08 Jul 2009 18:03:36 +0000 Received: by fxm4 with SMTP id 4so4392049fxm.10 for ; Wed, 08 Jul 2009 11:03:30 -0700 (PDT) Message-ID: <4A54DF6F.1010405@petalogix.com> Date: Wed, 08 Jul 2009 20:03:27 +0200 From: Michal Simek MIME-Version: 1.0 References: <4A54D14F.9090101@petalogix.com> <20090708.103520.193697491.davem@davemloft.net> In-Reply-To: <20090708.103520.193697491.davem@davemloft.net> Subject: Re: [LTP] mmap hw behavior Reply-To: michal.simek@petalogix.com List-Id: Linux Test Project General Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-list-bounces@lists.sourceforge.net To: David Miller Cc: linux-arch@vger.kernel.org, ltp-list@lists.sourceforge.net, arnd@arndb.de, linux-kernel@vger.kernel.org, lethal@linux-sh.org, mingo@elte.hu David Miller wrote: > From: Michal Simek > Date: Wed, 08 Jul 2009 19:03:11 +0200 > > >> When I call mmap for that open file with pointer to calloc place >> (first parameter, + length zero) it should be one tlb invalidation >> for calloc and new tlb which connect open file. We check it and we >> don't have any tlb invalidation that's why I think that kernel do >> different thigs. Or is it there any copying? Or anything different? >> > > There is no need to tlb flush the calloc area unless that memory area > is actually touched by the user application and thus the page is > faulted in. > That calloc area is filled by any value (in that test). Is it mean that for this case when calloc area is touched there must be tlb invalidation + remapping? Michal -- Michal Simek, Ing. (M.Eng) PetaLogix - Linux Solutions for a Reconfigurable World w: www.petalogix.com p: +61-7-30090663,+42-0-721842854 f: +61-7-30090663 ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Ltp-list mailing list Ltp-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ltp-list