From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 20 Aug 2004 22:01:58 -0700 From: William Lee Irwin III Subject: Re: [RFC] free_area[] bitmap elimination [0/3] Message-ID: <20040821050158.GT11200@holomorphy.com> References: <4126B3F9.90706@jp.fujitsu.com> <20040821025543.GS11200@holomorphy.com> <4126D6E5.9070804@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4126D6E5.9070804@jp.fujitsu.com> Sender: owner-linux-mm@kvack.org Return-Path: To: Hiroyuki KAMEZAWA Cc: linux-mm , LHMS List-ID: William Lee Irwin III wrote: >> Complexity maybe. But one serious issue this addresses beyond the needs >> of hotplug memory is that the buddy bitmaps are a heavily random-access >> data structures not used elsewhere. Consolidating them into the page >> structures should improve cache locality and motivate this patch beyond >> just the needs of hotplug memory. Furthermore, the patch also reduces >> the kernel's overall memory footprint by a small amount. >> However, I'm concerned about the effectiveness of this specific >> algorithm for coalescing. A more detailed description may help explain >> why the effectiveness of coalescing is preserved. On Sat, Aug 21, 2004 at 02:00:21PM +0900, Hiroyuki KAMEZAWA wrote: > Thanks for your comment, William-san. > I'd like to add detailed description on my patch. > I'm now afraid of the case of memory-hole, I should add > page_is_valid(buddy1) before > accessing buddy1. > I wrote a draft of description, does this explain what you want to know? This description is enough for me to understand it fully, thank you much. -- wli -- 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: aart@kvack.org