Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S272469AbTGZM0F (ORCPT ); Sat, 26 Jul 2003 08:26:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S272470AbTGZM0E (ORCPT ); Sat, 26 Jul 2003 08:26:04 -0400 Received: from adsl-110-19.38-151.net24.it ([151.38.19.110]:65458 "HELO develer.com") by vger.kernel.org with SMTP id S272469AbTGZMZ6 (ORCPT ); Sat, 26 Jul 2003 08:25:58 -0400 From: Bernardo Innocenti Organization: Develer S.r.l. To: Andrew Morton Subject: Re: [PATCH] Make I/O schedulers optional (Was: Re: Kernel 2.6 size increase) Date: Sat, 26 Jul 2003 14:40:51 +0200 User-Agent: KMail/1.5.9 Cc: hch@infradead.org, willy@w.ods.org, hch@lst.de, uclinux-dev@uclinux.org, linux-kernel@vger.kernel.org, alan@lxorguk.ukuu.org.uk, axboe@suse.de References: <200307232046.46990.bernie@develer.com> <200307260155.15099.bernie@develer.com> <20030726011708.6aa29641.akpm@osdl.org> In-Reply-To: <20030726011708.6aa29641.akpm@osdl.org> MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200307261440.52002.bernie@develer.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6909 Lines: 185 On Saturday 26 July 2003 10:17, Andrew Morton wrote: > > Here it is, attached below. I've tested it on both i386 and m68knommu. > > Is nice, but I wonder if it should be appearing under the > > General Setup -> Remove kernel features > > menu? ie: CONFIG_EMBEDDED. Right. Here is an updated patch. I think I've now tested it properly even with the noop scheduler on i386. Please apply. -------------------------------------------------------------------------- Add kconfig options to allow excluding either or both the I/O schedulers. Mostly useful for embedded systems (save ~13KB): With my desktop PC (i386) kernel: text data bss dec hex filename 2210707 475856 150444 2837007 2b4a0f vmlinux_with_ioscheds 2197763 473446 150380 2821589 2b0dd5 vmlinux_without_ioscheds With my uClinux (m68knommu) kernel: text data bss dec hex filename 807760 47384 78884 934028 e408c linux_without_ioscheds 819276 52460 78896 950632 e8168 linux_with_ioscheds diff -Nru linux-2.6.0-test1.orig/drivers/block/Kconfig.iosched linux-2.6.0-test1-with_elevator_patch/drivers/block/Kconfig.iosched --- linux-2.6.0-test1.orig/drivers/block/Kconfig.iosched 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.0-test1-with_elevator_patch/drivers/block/Kconfig.iosched 2003-07-26 14:25:44.000000000 +0200 @@ -0,0 +1,8 @@ +config IOSCHED_AS + bool "Anticipatory I/O scheduler" if EMBEDDED + default y + +config IOSCHED_DEADLINE + bool "Deadline I/O scheduler" if EMBEDDED + default y + diff -Nru linux-2.6.0-test1.orig/drivers/block/Makefile linux-2.6.0-test1-with_elevator_patch/drivers/block/Makefile --- linux-2.6.0-test1.orig/drivers/block/Makefile 2003-07-14 05:37:16.000000000 +0200 +++ linux-2.6.0-test1-with_elevator_patch/drivers/block/Makefile 2003-07-25 20:21:50.000000000 +0200 @@ -13,9 +13,10 @@ # kblockd threads # -obj-y := elevator.o ll_rw_blk.o ioctl.o genhd.o scsi_ioctl.o \ - deadline-iosched.o as-iosched.o +obj-y := elevator.o ll_rw_blk.o ioctl.o genhd.o scsi_ioctl.o +obj-$(CONFIG_IOSCHED_AS) += as-iosched.o +obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o obj-$(CONFIG_MAC_FLOPPY) += swim3.o obj-$(CONFIG_BLK_DEV_FD) += floppy.o obj-$(CONFIG_BLK_DEV_FD98) += floppy98.o diff -Nru linux-2.6.0-test1.orig/drivers/block/as-iosched.c linux-2.6.0-test1-with_elevator_patch/drivers/block/as-iosched.c --- linux-2.6.0-test1.orig/drivers/block/as-iosched.c 2003-07-14 05:28:54.000000000 +0200 +++ linux-2.6.0-test1-with_elevator_patch/drivers/block/as-iosched.c 2003-07-25 20:19:44.000000000 +0200 @@ -1,7 +1,7 @@ /* * linux/drivers/block/as-iosched.c * - * Anticipatory & deadline i/o scheduler. + * Anticipatory i/o scheduler. * * Copyright (C) 2002 Jens Axboe * Nick Piggin @@ -1832,6 +1832,7 @@ .elevator_exit_fn = as_exit, .elevator_ktype = &as_ktype, + .elevator_name = "anticipatory scheduling", }; EXPORT_SYMBOL(iosched_as); diff -Nru linux-2.6.0-test1.orig/drivers/block/deadline-iosched.c linux-2.6.0-test1-with_elevator_patch/drivers/block/deadline-iosched.c --- linux-2.6.0-test1.orig/drivers/block/deadline-iosched.c 2003-07-14 05:37:15.000000000 +0200 +++ linux-2.6.0-test1-with_elevator_patch/drivers/block/deadline-iosched.c 2003-07-25 20:20:53.000000000 +0200 @@ -941,6 +941,7 @@ .elevator_exit_fn = deadline_exit, .elevator_ktype = &deadline_ktype, + .elevator_name = "deadline", }; EXPORT_SYMBOL(iosched_deadline); diff -Nru linux-2.6.0-test1.orig/drivers/block/elevator.c linux-2.6.0-test1-with_elevator_patch/drivers/block/elevator.c --- linux-2.6.0-test1.orig/drivers/block/elevator.cator_name = 2003-07-14 05:36:48.000000000 +0200 +++ linux-2.6.0-test1-with_elevator_patch/drivers/block/elevator.c 2003-07-25 19:27:41.000000000 +0200 @@ -409,6 +409,7 @@ .elevator_merge_req_fn = elevator_noop_merge_requests, .elevator_next_req_fn = elevator_noop_next_request, .elevator_add_req_fn = elevator_noop_add_request, + .elevator_name = "noop", }; module_init(elevator_global_init); diff -Nru linux-2.6.0-test1.orig/drivers/block/ll_rw_blk.c linux-2.6.0-test1-with_elevator_patch/drivers/block/ll_rw_blk.c --- linux-2.6.0-test1.orig/drivers/block/ll_rw_blk.c 2003-07-14 05:30:40.000000000 +0200 +++ linux-2.6.0-test1-with_elevator_patch/drivers/block/ll_rw_blk.c 2003-07-25 19:27:02.000000000 +0200 @@ -1205,17 +1205,31 @@ static int __make_request(request_queue_t *, struct bio *); -static elevator_t *chosen_elevator = &iosched_as; +static elevator_t *chosen_elevator = +#if defined(CONFIG_IOSCHED_AS) + &iosched_as; +#elif defined(CONFIG_IOSCHED_DEADLINE) + &iosched_deadline; +#else + &elevator_noop; +#endif +#if defined(CONFIG_IOSCHED_AS) || defined(CONFIG_IOSCHED_DEADLINE) static int __init elevator_setup(char *str) { +#ifdef CONFIG_IOSCHED_DEADLINE if (!strcmp(str, "deadline")) chosen_elevator = &iosched_deadline; +#endif +#ifdef CONFIG_IOSCHED_AS if (!strcmp(str, "as")) chosen_elevator = &iosched_as; +#endif return 1; } + __setup("elevator=", elevator_setup); +#endif /* CONFIG_IOSCHED_AS || CONFIG_IOSCHED_DEADLINE */ ator_name = /** * blk_init_queue - prepare a request queue for use with a block device @@ -1255,10 +1269,7 @@ if (!printed) { printed = 1; - if (chosen_elevator == &iosched_deadline) - printk("deadline elevator\n"); - else if (chosen_elevator == &iosched_as) - printk("anticipatory scheduling elevator\n"); + printk("Using %s elevator\n", chosen_elevator->elevator_name); } if ((ret = elevator_init(q, chosen_elevator))) { diff -Nru linux-2.6.0-test1.orig/init/Kconfig linux-2.6.0-test1-with_elevator_patch/init/Kconfig --- linux-2.6.0-test1.orig/init/Kconfig 2003-07-14 05:37:16.000000000 +0200 +++ linux-2.6.0-test1-with_elevator_patch/init/Kconfig 2003-07-26 14:25:48.000000000 +0200 @@ -141,6 +141,8 @@ Disabling this option will cause the kernel to be built without support for epoll family of system calls. +source "drivers/block/Kconfig.iosched" + endmenu # General setup diff -Nru linux-2.6.0-test1.orig/include/linux/elevator.h linux-2.6.0-test1/include/linux/elevator.h --- linux-2.6.0-test1.orig/include/linux/elevator.h 2003-07-14 05:29:27.000000000 +0200 +++ linux-2.6.0-test1/include/linux/elevator.h 2003-07-25 19:18:39.000000000 +0200 @@ -52,6 +52,7 @@ struct kobject kobj; struct kobj_type *elevator_ktype; + const char *elevator_name; }; /* -- // Bernardo Innocenti - Develer S.r.l., R&D dept. \X/ http://www.develer.com/ Please don't send Word attachments - http://www.gnu.org/philosophy/no-word-attachments.html - 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/