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 CCF9A6B01AF for ; Wed, 16 Jun 2010 01:08:08 -0400 (EDT) Date: Wed, 16 Jun 2010 01:07:57 -0400 From: Christoph Hellwig Subject: Re: [PATCH 12/12] vmscan: Do not writeback pages in direct reclaim Message-ID: <20100616050757.GB10687@infradead.org> References: <1276514273-27693-13-git-send-email-mel@csn.ul.ie> <4C16A567.4080000@redhat.com> <20100615114510.GE26788@csn.ul.ie> <4C17815A.8080402@redhat.com> <20100615135928.GK26788@csn.ul.ie> <4C178868.2010002@redhat.com> <20100615141601.GL26788@csn.ul.ie> <20100616091755.7121c7d3.kamezawa.hiroyu@jp.fujitsu.com> <4C181AFD.5060503@redhat.com> <20100616093958.00673123.kamezawa.hiroyu@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100616093958.00673123.kamezawa.hiroyu@jp.fujitsu.com> Sender: owner-linux-mm@kvack.org To: KAMEZAWA Hiroyuki Cc: Rik van Riel , Mel Gorman , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Dave Chinner , Chris Mason , Nick Piggin , Johannes Weiner , Christoph Hellwig , Andrew Morton List-ID: On Wed, Jun 16, 2010 at 09:39:58AM +0900, KAMEZAWA Hiroyuki wrote: > Hmm. But I don't expect copy_from/to_user is called in very deep stack. Actually it is. The poll code mentioned earlier in this thread is just want nasty example. I'm pretty sure there are tons of others in ioctl code, as various ioctl implementations have been found to be massive stack hogs in the past, even worse for out of tree drivers. -- 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