Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261761AbUKUL3w (ORCPT ); Sun, 21 Nov 2004 06:29:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261944AbUKUL3w (ORCPT ); Sun, 21 Nov 2004 06:29:52 -0500 Received: from mail.euroweb.hu ([193.226.220.4]:8643 "HELO mail.euroweb.hu") by vger.kernel.org with SMTP id S261587AbUKUL3q (ORCPT ); Sun, 21 Nov 2004 06:29:46 -0500 To: bulb@ucw.cz CC: pavel@ucw.cz, akpm@osdl.org, torvalds@osdl.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org In-reply-to: <20041121103956.GW2870@vagabond> (message from Jan Hudec on Sun, 21 Nov 2004 11:39:56 +0100) Subject: Re: [PATCH] [Request for inclusion] Filesystem in Userspace References: <20041117190055.GC6952@openzaurus.ucw.cz> <20041117204424.GC11439@elf.ucw.cz> <20041118144634.GA7922@openzaurus.ucw.cz> <20041121095038.GV2870@vagabond> <20041121103956.GW2870@vagabond> Message-Id: From: Miklos Szeredi Date: Sun, 21 Nov 2004 12:29:34 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1261 Lines: 32 > Measured under what conditions? dorka:/home/miko/fuse-bugfix# touch /tmp/fusenull dorka:/home/miko/fuse-bugfix# example/null /tmp/fusenull dorka:/home/miko/fuse-bugfix# time dd if=/dev/zero of=/tmp/fusenull bs=4096 count=262144 262144+0 records in 262144+0 records out 1073741824 bytes transferred in 12.591578 seconds (85274604 bytes/sec) real 0m12.662s user 0m0.189s sys 0m8.156s dorka:/home/miko/fuse-bugfix# fusermount -u /tmp/fusenull fusenull is a /dev/null like filesystem implemented with the libfuse API (see fuse sources). > There may be only one dirty page in the whole system and it may be the > one backed by FUSE. Now yes, if it was not backed by FUSE, I would be in > trouble -- but the OOM killer would get me out. It will *NOT* get me out > with fuse, because it thinks the page will be cleaned, which it won't. OK, I see your point. But can't the memory subsystem be tought, that those pages are not guaranteed to be written back in a limited time? Miklos - 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/