From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 6A80C6B01F6 for ; Thu, 22 Apr 2010 11:28:54 -0400 (EDT) Message-ID: <4BD06B31.9050306@redhat.com> Date: Thu, 22 Apr 2010 18:28:49 +0300 From: Avi Kivity MIME-Version: 1.0 Subject: Re: Frontswap [PATCH 0/4] (was Transcendent Memory): overview References: <20100422134249.GA2963@ca-server1.us.oracle.com> In-Reply-To: <20100422134249.GA2963@ca-server1.us.oracle.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Dan Magenheimer Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, jeremy@goop.org, hugh.dickins@tiscali.co.uk, ngupta@vflare.org, JBeulich@novell.com, chris.mason@oracle.com, kurt.hackel@oracle.com, dave.mccracken@oracle.com, npiggin@suse.de, akpm@linux-foundation.org, riel@redhat.com List-ID: On 04/22/2010 04:42 PM, Dan Magenheimer wrote: > Frontswap is so named because it can be thought of as the opposite of > a "backing" store for a swap device. The storage is assumed to be > a synchronous concurrency-safe page-oriented pseudo-RAM device (such as > Xen's Transcendent Memory, aka "tmem", or in-kernel compressed memory, > aka "zmem", or other RAM-like devices) which is not directly accessible > or addressable by the kernel and is of unknown and possibly time-varying > size. This pseudo-RAM device links itself to frontswap by setting the > frontswap_ops pointer appropriately and the functions it provides must > conform to certain policies as follows: > How baked in is the synchronous requirement? Memory, for example, can be asynchronous if it is copied by a dma engine, and since there are hardware encryption engines, there may be hardware compression engines in the future. -- error compiling committee.c: too many arguments to function -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org