Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755213Ab2BAS3y (ORCPT ); Wed, 1 Feb 2012 13:29:54 -0500 Received: from bar.sig21.net ([80.81.252.164]:36300 "EHLO bar.sig21.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754942Ab2BAS3l (ORCPT ); Wed, 1 Feb 2012 13:29:41 -0500 Date: Wed, 1 Feb 2012 19:29:32 +0100 From: Johannes Stezenbach To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Thomas Gleixner Subject: Re: huge debug_objects_cache. swapping but 25% mem free Message-ID: <20120201182932.GA15518@sig21.net> References: <20120130154048.GA421@sig21.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120130154048.GA421@sig21.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-Spam-21-Score: -2.9 (--) X-Spam-21-Report: No, score=-2.9 required=8.0 tests=ALL_TRUSTED=-1,BAYES_00=-1.9 autolearn=ham Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1736 Lines: 48 On Mon, Jan 30, 2012 at 04:40:48PM +0100, Johannes Stezenbach wrote: > > According to slabtop debug_objects_cache eats half the > memory, is this expected? The Kconfig help text does not > suggest it. FWIW, today after running full backup using rsync: OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 4025450 4025447 99% 0.36K 183977 22 1471816K debug_objects_cache 170266 87241 51% 1.74K 9645 18 308640K ext3_inode_cache 54855 40215 73% 0.58K 2034 27 32544K dentry 38124 12474 32% 0.42K 2119 18 16952K buffer_head 17794 17464 98% 0.51K 574 31 9184K sysfs_dir_cache 11434 8494 74% 0.87K 713 18 11408K radix_tree_node 11400 5570 48% 0.38K 570 20 4560K kmalloc-64 /sys/kernel/debug/debug_objects/stats: max_chain :870 warnings :0 fixups :0 pool_free :258 pool_min_free :252 pool_used :4025193 pool_max_used :4025195 then after "echo 3 >/proc/sys/vm/drop_caches": OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 4030488 4030485 99% 0.36K 184206 22 1473648K debug_objects_cache 17955 9071 50% 0.58K 665 27 10640K dentry 17763 17455 98% 0.51K 573 31 9168K sysfs_dir_cache 9408 9156 97% 0.33K 392 24 3136K kmalloc-8 I'm still not sure if this is normal behaviour of DEBUG_OBJECTS or a bug? Anyway, I'm going to turn it off now. Johannes -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/