Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 8 Feb 2001 04:31:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 8 Feb 2001 04:31:41 -0500 Received: from www.wen-online.de ([212.223.88.39]:44804 "EHLO wen-online.de") by vger.kernel.org with ESMTP id ; Thu, 8 Feb 2001 04:31:38 -0500 Date: Thu, 8 Feb 2001 10:31:20 +0100 (CET) From: Mike Galbraith To: Christoph Rohland cc: Jens Axboe , linux-kernel Subject: tmpfs swapoff oddity Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi Christoph, While testing Jens' loop-4 patch (and not being able to find any way to lock it up), I stumbled onto a strange behavior. I set up an interleaved swap with one swap partition, and one swapfile in a loopback mounted reiserfs - populated tmpfs with a kernel tree and did hefty make -j kernel builds to generate much I/O. Afterward (bored), I figured I'd bounce the data in tmpfs back and forth between swap containers with swapoff. It took much longer than I expected. This is likely only something a bored tester would do, but it seems odd enough to report.. repeated without loop. [root]:# pwd /var/tmp/linux-2.4.2-pre1 [root]:# df Filesystem 1k-blocks Used Available Use% Mounted on /dev/hda6 4157873 3734124 213701 95% / shm 499092 0 499092 0% /dev/shm /dev/hda7 256592 155715 87625 64% /var tmpfs 622228 123136 499092 20% /var/tmp /dev/hda8 10445318 6450096 3669907 64% /usr/local /dev/hda1 4088532 2286968 1801564 56% /dos_c [root]:# mount /dev/hda6 on / type ext2 (rw) proc on /proc type proc (rw) shm on /dev/shm type shm (rw) /dev/hda7 on /var type ext2 (rw) tmpfs on /var/tmp type tmpfs (rw) /dev/hda8 on /usr/local type ext2 (rw) /dev/hda1 on /dos_c type vfat (rw,noexec) devpts on /dev/pts type devpts (rw,gid=5,mode=0620) [root]:# swapon -s Filename Type Size Used Priority /dev/hda2 partition 265064 127356 2 /dev/hda5 partition 265032 0 2 [root]:# time swapoff /dev/hda2 real 7m17.555s user 0m0.010s sys 7m3.040s [root]:# - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/