Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 3 Nov 2000 14:16:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 3 Nov 2000 14:15:59 -0500 Received: from inet-smtp3.oracle.com ([205.227.43.23]:13502 "EHLO inet-smtp3.oracle.com") by vger.kernel.org with ESMTP id ; Fri, 3 Nov 2000 14:15:50 -0500 Message-ID: <3A030EE2.92DC3F2@oracle.com> Date: Fri, 03 Nov 2000 11:15:46 -0800 From: Josue Emmanuel Amaro Organization: Linux Strategic Business Unit, Oracle Corporation X-Mailer: Mozilla 4.75 [en] (WinNT; U) X-Accept-Language: en,pdf MIME-Version: 1.0 To: Linux-Kernel Subject: Value of TASK_UNMAPPED_SIZE on 2.4 Content-Type: multipart/mixed; boundary="------------E7646E6CF7A8BFC1D1841EEE" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is a multi-part message in MIME format. --------------E7646E6CF7A8BFC1D1841EEE Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit All, TASK_UNMAPPED_SIZE is defined in include/asm-i386/processor.h as: #define TASK_UNMAPPED_SIZE (TASK_SIZE / 3) The value of TASK_SIZE is defined as PAGE_OFFSET which is set to 0xC0000000 (page.h). This works out to be a value of 0x4000000. The question is: Are there any negative side effects in defining TASK_UNMAPPED_SIZE to 0x1000000? By doing this we allow a process to access more memory. On Oracle it allows us to grow our buffer size from 1.7 GB to 2.4 GB improving overall performance by reducing I/O. Thanks in advance, -- ======================================================================= Josue Emmanuel Amaro Josue.Amaro@oracle.com Linux Products Manager Phone: 650.506.1239 Intel and Linux Technologies Group Fax: 650.413.0167 ======================================================================= --------------E7646E6CF7A8BFC1D1841EEE Content-Type: text/x-vcard; charset=us-ascii; name="Josue.Amaro.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Josue Emmanuel Amaro Content-Disposition: attachment; filename="Josue.Amaro.vcf" begin:vcard n:Amaro;Josue Emmanuel tel;cell:650-245-5131 tel;fax:650-413-0167 tel;work:650-506-1239 x-mozilla-html:FALSE url:http://www.oracle.com org:Intel and Linux Technologies version:2.1 email;internet:Josue.Amaro@oracle.com title:Sr.Product Manager - Linux adr;quoted-printable:;;500 Oracle Parkway=0D=0AMS1ip4;Redwood Shores;CA;94065;United States fn:Josue Emmanuel Amaro end:vcard --------------E7646E6CF7A8BFC1D1841EEE-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/