From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from moutng.kundenserver.de ([212.227.17.9]:52100 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757823Ab1FQMrK (ORCPT ); Fri, 17 Jun 2011 08:47:10 -0400 From: Arnd Bergmann To: Larry Bassel Subject: Re: [Linaro-mm-sig] [PATCH 08/10] mm: cma: Contiguous Memory Allocator added Date: Fri, 17 Jun 2011 14:45:09 +0200 Cc: Marek Szyprowski , "'Zach Pfeffer'" , "'Daniel Walker'" , "'Daniel Stone'" , "'Jesse Barker'" , "'Mel Gorman'" , "'KAMEZAWA Hiroyuki'" , linux-kernel@vger.kernel.org, "'Michal Nazarewicz'" , linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org, "'Kyungmin Park'" , "'Ankita Garg'" , "'Andrew Morton'" , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org References: <1307699698-29369-1-git-send-email-m.szyprowski@samsung.com> <201106160006.07742.arnd@arndb.de> <20110616170133.GC28032@labbmf-linux.qualcomm.com> In-Reply-To: <20110616170133.GC28032@labbmf-linux.qualcomm.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201106171445.09567.arnd@arndb.de> List-ID: Sender: On Thursday 16 June 2011 19:01:33 Larry Bassel wrote: > > Can you describe how the memory areas differ specifically? > > Is there one that is always faster but very small, or are there > > just specific circumstances under which some memory is faster than > > another? > > One is always faster, but very small (generally 2-10% the size > of "normal" memory). > Ok, that sounds like the "SRAM" regions that we are handling on some ARM platforms using the various interfaces. It should probably remain outside of the regular allocator, but we can try to generalize the SRAM support further. There are many possible uses for it. Arnd