From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id 4C7F26B0092 for ; Sat, 30 May 2009 02:52:21 -0400 (EDT) Date: Fri, 29 May 2009 23:53:02 -0700 From: Andrew Morton Subject: Re: More thoughts about hwpoison and pageflags compression Message-Id: <20090529235302.ccf58d88.akpm@linux-foundation.org> In-Reply-To: <20090530063710.GI1065@one.firstfloor.org> References: <200905291135.124267638@firstfloor.org> <20090529225202.0c61a4b3@lxorguk.ukuu.org.uk> <20090530063710.GI1065@one.firstfloor.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Andi Kleen Cc: Alan Cox , linux-kernel@vger.kernel.org, linux-mm@kvack.org, fengguang.wu@intel.com List-ID: On Sat, 30 May 2009 08:37:10 +0200 Andi Kleen wrote: > So using a separate bit is a sensible choice imho. Could you make the feature 64-bit-only and use one of bits 32-63? Did you consider making the poison tag external to the pageframe? Some hash(page*) into a bitmap or something? If suitably designed, such infrastructure could perhaps be reused to reclaim some existing page flags. Dave Hansen had such a patch a few years back. Or maybe it was Andy Whitcroft. -- 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