From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d03relay04.boulder.ibm.com (d03relay04.boulder.ibm.com [9.17.195.106]) by e32.co.us.ibm.com (8.12.11.20060308/8.13.8) with ESMTP id l9UGNXbs012174 for ; Tue, 30 Oct 2007 12:23:33 -0400 Received: from d03av04.boulder.ibm.com (d03av04.boulder.ibm.com [9.17.195.170]) by d03relay04.boulder.ibm.com (8.13.8/8.13.8/NCO v8.5) with ESMTP id l9UHNcji061832 for ; Tue, 30 Oct 2007 11:23:39 -0600 Received: from d03av04.boulder.ibm.com (loopback [127.0.0.1]) by d03av04.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id l9UHNbSM032131 for ; Tue, 30 Oct 2007 11:23:37 -0600 Subject: migratepage failures on reiserfs From: Badari Pulavarty Content-Type: text/plain Date: Tue, 30 Oct 2007 10:27:04 -0800 Message-Id: <1193768824.8904.11.camel@dyn9047017100.beaverton.ibm.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: reiserfs-devel@vger.kernel.org Cc: linux-mm , linux-fsdevel List-ID: Hi, While testing hotplug memory remove, I ran into this issue. Given a range of pages hotplug memory remove tries to migrate those pages. migrate_pages() keeps failing to migrate pages containing pagecache pages for reiserfs files. I noticed that reiserfs doesn't have ->migratepage() ops. So, fallback_migrate_page() code tries to do try_to_release_page(). try_to_release_page() fails to drop_buffers() since b_count == 1. Here is what my debug shows: migrate pages failed pfn 258111/flags 3f00000000801 bh c00000000b53f6e0 flags 110029 count 1 Any one know why the b_count == 1 and not getting dropped to zero ? Thanks, Badari -- 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