From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757646Ab2CGMLS (ORCPT ); Wed, 7 Mar 2012 07:11:18 -0500 Received: from mail-ee0-f46.google.com ([74.125.83.46]:64344 "EHLO mail-ee0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757548Ab2CGMLR convert rfc822-to-8bit (ORCPT ); Wed, 7 Mar 2012 07:11:17 -0500 Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes To: m.szyprowski@samsung.com, "Barry Song" Cc: workgroup.linux@csr.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, "Barry Song" Subject: Re: [PATCH v4] mm: cma: add a simple kernel module as the helper to test CMA References: <1331120259-30780-1-git-send-email-Barry.Song@csr.com> Date: Wed, 07 Mar 2012 13:11:13 +0100 MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT From: "Michal Nazarewicz" Message-ID: In-Reply-To: <1331120259-30780-1-git-send-email-Barry.Song@csr.com> User-Agent: Opera Mail/11.61 (Linux) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 07 Mar 2012 12:37:39 +0100, Barry Song wrote: > Any write request to /dev/cma_test will let the module to allocate memory from > CMA, for example: > > 1st time > $ echo 1024 > /dev/cma_test > will require cma_test to request 1MB(1024KB) > 2nd time > $ echo 2048 > /dev/cma_test > will require cma_test to request 2MB(2048KB) > > Any read request to /dev/cma_test will let the module to free the 1st valid > memory from CMA, for example: > > 1st time > $ cat /dev/cma_test > will require cma_test to free the 1MB allocated in the first write request > 2nd time > $ cat /dev/cma_test > will require cma_test to free the 2MB allocated in the second write request > > Signed-off-by: Barry Song Reviewed-by: Michal Nazarewicz -- Best regards, _ _ .o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o ..o | Computer Science, Michał “mina86” Nazarewicz (o o) ooo +------------------ooO--(_)--Ooo--