From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 7 Jul 2007 06:57:12 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [BUGFIX][PATCH] DO flush icache before set_pte() on ia64. Message-Id: <20070707065712.5abbbe43.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: References: <20070704150504.423f6c54.kamezawa.hiroyu@jp.fujitsu.com> <468B3EAA.9070905@yahoo.com.au> <20070704163826.d0b7465b.kamezawa.hiroyu@jp.fujitsu.com> <468C51A7.3070505@yahoo.com.au> <20070705114726.2449f270.kamezawa.hiroyu@jp.fujitsu.com> <468C634D.9050306@yahoo.com.au> <20070705125427.9a3b8e8b.kamezawa.hiroyu@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: nickpiggin@yahoo.com.au, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, tony.luck@intel.com, linux-mm@kvack.org, Mike.stroya@hp.com, y-goto@jp.fujitsu.com, dmosberger@gmail.com, hugh@veritas.com List-ID: On Fri, 6 Jul 2007 10:32:29 -0700 (PDT) Christoph Lameter wrote: > I am a bit worried about the performance impact of all this flushing? What > is the worst case scenario here? > IMHO.... When a user set VM_EXEC to their anonymous memory intentionally and does many page faults. I myself don't think (file's) page cache flushing is not so heavy work because PG_arch_1 guarantees that icache flushing occurs just once at the first read in the system. Thanks, -Kame -- 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