Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755452AbZINMaM (ORCPT ); Mon, 14 Sep 2009 08:30:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755356AbZINMaL (ORCPT ); Mon, 14 Sep 2009 08:30:11 -0400 Received: from mail.valinux.co.jp ([210.128.90.3]:39059 "EHLO mail.valinux.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754671AbZINMaJ (ORCPT ); Mon, 14 Sep 2009 08:30:09 -0400 Date: Mon, 14 Sep 2009 21:30:11 +0900 (JST) Message-Id: <20090914.213011.189721100.ryov@valinux.co.jp> To: linux-kernel@vger.kernel.org, dm-devel@redhat.com, containers@lists.linux-foundation.org, virtualization@lists.linux-foundation.org, xen-devel@lists.xensource.com, agk@redhat.com Subject: [PATCH 5/9] blkio-cgroup-v12: The body of blkio-cgroup From: Ryo Tsuruta In-Reply-To: <20090914.212946.104038099.ryov@valinux.co.jp> References: <20090914.212839.226798134.ryov@valinux.co.jp> <20090914.212909.71094050.ryov@valinux.co.jp> <20090914.212946.104038099.ryov@valinux.co.jp> X-Mailer: Mew version 5.2.52 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 15865 Lines: 550 The body of blkio-cgroup. Signed-off-by: Hirokazu Takahashi Signed-off-by: Ryo Tsuruta --- include/linux/biotrack.h | 100 ++++++++++++++ include/linux/cgroup_subsys.h | 6 init/Kconfig | 13 + mm/Makefile | 1 mm/biotrack.c | 293 ++++++++++++++++++++++++++++++++++++++++++ mm/page_cgroup.c | 20 +- 6 files changed, 424 insertions(+), 9 deletions(-) Index: linux-2.6.31/include/linux/biotrack.h =================================================================== --- /dev/null +++ linux-2.6.31/include/linux/biotrack.h @@ -0,0 +1,100 @@ +#include +#include +#include + +#ifndef _LINUX_BIOTRACK_H +#define _LINUX_BIOTRACK_H + +#ifdef CONFIG_CGROUP_BLKIO + +struct io_context; +struct block_device; + +struct blkio_cgroup { + struct cgroup_subsys_state css; + struct io_context *io_context; /* default io_context */ +/* struct radix_tree_root io_context_root; per device io_context */ +}; + +/** + * __init_blkio_page_cgroup() - initialize a blkio_page_cgroup + * @pc: page_cgroup of the page + * + * Reset the owner ID of a page. + */ +static inline void __init_blkio_page_cgroup(struct page_cgroup *pc) +{ + pc->blkio_cgroup_id = 0; +} + +/** + * blkio_cgroup_disabled() - check whether blkio_cgroup is disabled + * + * Returns true if disabled, false if not. + */ +static inline bool blkio_cgroup_disabled(void) +{ + if (blkio_cgroup_subsys.disabled) + return true; + return false; +} + +extern void blkio_cgroup_set_owner(struct page *page, struct mm_struct *mm); +extern void blkio_cgroup_reset_owner(struct page *page, struct mm_struct *mm); +extern void blkio_cgroup_reset_owner_pagedirty(struct page *page, + struct mm_struct *mm); +extern void blkio_cgroup_copy_owner(struct page *page, struct page *opage); + +extern struct io_context *get_blkio_cgroup_iocontext(struct bio *bio); +extern unsigned long get_blkio_cgroup_id(struct bio *bio); +extern struct cgroup *get_cgroup_from_page(struct page *page); + +#else /* !CONFIG_CGROUP_BLKIO */ + +struct blkio_cgroup; + +static inline void __init_blkio_page_cgroup(struct page_cgroup *pc) +{ +} + +static inline bool blkio_cgroup_disabled(void) +{ + return true; +} + +static inline void blkio_cgroup_set_owner(struct page *page, struct mm_struct *mm) +{ +} + +static inline void blkio_cgroup_reset_owner(struct page *page, + struct mm_struct *mm) +{ +} + +static inline void blkio_cgroup_reset_owner_pagedirty(struct page *page, + struct mm_struct *mm) +{ +} + +static inline void blkio_cgroup_copy_owner(struct page *page, struct page *opage) +{ +} + +static inline struct io_context *get_blkio_cgroup_iocontext(struct bio *bio) +{ + return NULL; +} + +static inline unsigned long get_blkio_cgroup_id(struct bio *bio) +{ + return 0; +} + +static inline struct cgroup *get_cgroup_from_page(struct page *page) +{ + return NULL; +} + +#endif /* CONFIG_CGROUP_BLKIO */ + +#endif /* _LINUX_BIOTRACK_H */ Index: linux-2.6.31/include/linux/cgroup_subsys.h =================================================================== --- linux-2.6.31.orig/include/linux/cgroup_subsys.h +++ linux-2.6.31/include/linux/cgroup_subsys.h @@ -43,6 +43,12 @@ SUBSYS(mem_cgroup) /* */ +#ifdef CONFIG_CGROUP_BLKIO +SUBSYS(blkio_cgroup) +#endif + +/* */ + #ifdef CONFIG_CGROUP_DEVICE SUBSYS(devices) #endif Index: linux-2.6.31/init/Kconfig =================================================================== --- linux-2.6.31.orig/init/Kconfig +++ linux-2.6.31/init/Kconfig @@ -614,9 +614,20 @@ config CGROUP_MEM_RES_CTLR_SWAP endif # CGROUPS +config CGROUP_BLKIO + bool "Block I/O cgroup subsystem" + depends on CGROUPS && BLOCK + select MM_OWNER + help + Provides a Resource Controller which enables to track the onwner + of every Block I/O requests. + The information this subsystem provides can be used from any + kind of module such as dm-ioband device mapper modules or + the cfq-scheduler. + config CGROUP_PAGE def_bool y - depends on CGROUP_MEM_RES_CTLR + depends on CGROUP_MEM_RES_CTLR || CGROUP_BLKIO config MM_OWNER bool Index: linux-2.6.31/mm/biotrack.c =================================================================== --- /dev/null +++ linux-2.6.31/mm/biotrack.c @@ -0,0 +1,293 @@ +/* biotrack.c - Block I/O Tracking + * + * Copyright (C) VA Linux Systems Japan, 2008-2009 + * Developed by Hirokazu Takahashi + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include + +/* + * The block I/O tracking mechanism is implemented on the cgroup memory + * controller framework. It helps to find the the owner of an I/O request + * because every I/O request has a target page and the owner of the page + * can be easily determined on the framework. + */ + +/* Return the blkio_cgroup that associates with a cgroup. */ +static inline struct blkio_cgroup *cgroup_blkio(struct cgroup *cgrp) +{ + return container_of(cgroup_subsys_state(cgrp, blkio_cgroup_subsys_id), + struct blkio_cgroup, css); +} + +/* Return the blkio_cgroup that associates with a process. */ +static inline struct blkio_cgroup *blkio_cgroup_from_task(struct task_struct *p) +{ + return container_of(task_subsys_state(p, blkio_cgroup_subsys_id), + struct blkio_cgroup, css); +} + +static struct io_context default_blkio_io_context; +static struct blkio_cgroup default_blkio_cgroup = { + .io_context = &default_blkio_io_context, +}; + +/** + * blkio_cgroup_set_owner() - set the owner ID of a page. + * @page: the page we want to tag + * @mm: the mm_struct of a page owner + * + * Make a given page have the blkio-cgroup ID of the owner of this page. + */ +void blkio_cgroup_set_owner(struct page *page, struct mm_struct *mm) +{ + struct blkio_cgroup *biog; + struct page_cgroup *pc; + + if (blkio_cgroup_disabled()) + return; + pc = lookup_page_cgroup(page); + if (unlikely(!pc)) + return; + + pc->blkio_cgroup_id = 0; /* 0: default blkio_cgroup id */ + if (!mm) + return; + /* + * Locking "pc" isn't necessary here since the current process is + * the only one that can access the members related to blkio_cgroup. + */ + rcu_read_lock(); + biog = blkio_cgroup_from_task(rcu_dereference(mm->owner)); + if (unlikely(!biog)) + goto out; + /* + * css_get(&bio->css) isn't called to increment the reference + * count of this blkio_cgroup "biog" so pc->blkio_cgroup_id + * might turn invalid even if this page is still active. + * This approach is chosen to minimize the overhead. + */ + pc->blkio_cgroup_id = css_id(&biog->css); +out: + rcu_read_unlock(); +} + +/** + * blkio_cgroup_reset_owner() - reset the owner ID of a page + * @page: the page we want to tag + * @mm: the mm_struct of a page owner + * + * Change the owner of a given page if necessary. + */ +void blkio_cgroup_reset_owner(struct page *page, struct mm_struct *mm) +{ + /* + * A little trick: + * Just call blkio_cgroup_set_owner() for pages which are already + * active since the blkio_cgroup_id member of page_cgroup can be + * updated without any locks. This is because an integer type of + * variable can be set a new value at once on modern cpus. + */ + blkio_cgroup_set_owner(page, mm); +} + +/** + * blkio_cgroup_reset_owner_pagedirty() - reset the owner ID of a pagecache page + * @page: the page we want to tag + * @mm: the mm_struct of a page owner + * + * Change the owner of a given page if the page is in the pagecache. + */ +void blkio_cgroup_reset_owner_pagedirty(struct page *page, struct mm_struct *mm) +{ + if (!page_is_file_cache(page)) + return; + if (current->flags & PF_MEMALLOC) + return; + + blkio_cgroup_reset_owner(page, mm); +} + +/** + * blkio_cgroup_copy_owner() - copy the owner ID of a page into another page + * @npage: the page where we want to copy the owner + * @opage: the page from which we want to copy the ID + * + * Copy the owner ID of @opage into @npage. + */ +void blkio_cgroup_copy_owner(struct page *npage, struct page *opage) +{ + struct page_cgroup *npc, *opc; + + if (blkio_cgroup_disabled()) + return; + npc = lookup_page_cgroup(npage); + if (unlikely(!npc)) + return; + opc = lookup_page_cgroup(opage); + if (unlikely(!opc)) + return; + + /* + * Do this without any locks. The reason is the same as + * blkio_cgroup_reset_owner(). + */ + npc->blkio_cgroup_id = opc->blkio_cgroup_id; +} + +/* Create a new blkio-cgroup. */ +static struct cgroup_subsys_state * +blkio_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp) +{ + struct blkio_cgroup *biog; + struct io_context *ioc; + + if (!cgrp->parent) { + biog = &default_blkio_cgroup; + init_io_context(biog->io_context); + /* Increment the referrence count not to be released ever. */ + atomic_long_inc(&biog->io_context->refcount); + return &biog->css; + } + + biog = kzalloc(sizeof(*biog), GFP_KERNEL); + if (!biog) + return ERR_PTR(-ENOMEM); + ioc = alloc_io_context(GFP_KERNEL, -1); + if (!ioc) { + kfree(biog); + return ERR_PTR(-ENOMEM); + } + biog->io_context = ioc; + return &biog->css; +} + +/* Delete the blkio-cgroup. */ +static void blkio_cgroup_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp) +{ + struct blkio_cgroup *biog = cgroup_blkio(cgrp); + + put_io_context(biog->io_context); + free_css_id(&blkio_cgroup_subsys, &biog->css); + kfree(biog); +} + +/** + * get_blkio_cgroup_id() - determine the blkio-cgroup ID + * @bio: the &struct bio which describes the I/O + * + * Returns the blkio-cgroup ID of a given bio. A return value zero + * means that the page associated with the bio belongs to default_blkio_cgroup. + */ +unsigned long get_blkio_cgroup_id(struct bio *bio) +{ + struct page_cgroup *pc; + struct page *page = bio_iovec_idx(bio, 0)->bv_page; + unsigned long id = 0; + + pc = lookup_page_cgroup(page); + if (pc) + id = pc->blkio_cgroup_id; + return id; +} + +/** + * get_blkio_cgroup_iocontext() - determine the blkio-cgroup iocontext + * @bio: the &struct bio which describe the I/O + * + * Returns the iocontext of blkio-cgroup that issued a given bio. + */ +struct io_context *get_blkio_cgroup_iocontext(struct bio *bio) +{ + struct cgroup_subsys_state *css; + struct blkio_cgroup *biog; + struct io_context *ioc; + unsigned long id; + + id = get_blkio_cgroup_id(bio); + rcu_read_lock(); + css = css_lookup(&blkio_cgroup_subsys, id); + if (css) + biog = container_of(css, struct blkio_cgroup, css); + else + biog = &default_blkio_cgroup; + ioc = biog->io_context; /* default io_context for this cgroup */ + atomic_long_inc(&ioc->refcount); + rcu_read_unlock(); + return ioc; +} + +/** + * get_cgroup_from_page() - determine the cgroup from a page. + * @page: the page to be tracked + * + * Returns the cgroup of a given page. A return value zero means that + * the page associated with the page belongs to default_blkio_cgroup. + * + * Note: + * This function must be called under rcu_read_lock(). + */ +struct cgroup *get_cgroup_from_page(struct page *page) +{ + struct page_cgroup *pc; + struct cgroup_subsys_state *css; + + pc = lookup_page_cgroup(page); + if (!pc || !pc->blkio_cgroup_id) + return NULL; + + css = css_lookup(&blkio_cgroup_subsys, pc->blkio_cgroup_id); + if (!css) + return NULL; + + return css->cgroup; +} + +EXPORT_SYMBOL(get_blkio_cgroup_id); +EXPORT_SYMBOL(get_blkio_cgroup_iocontext); +EXPORT_SYMBOL(get_cgroup_from_page); + +/* Read the ID of the specified blkio cgroup. */ +static u64 blkio_id_read(struct cgroup *cgrp, struct cftype *cft) +{ + struct blkio_cgroup *biog = cgroup_blkio(cgrp); + + return (u64)css_id(&biog->css); +} + +static struct cftype blkio_files[] = { + { + .name = "id", + .read_u64 = blkio_id_read, + }, +}; + +static int blkio_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cgrp) +{ + return cgroup_add_files(cgrp, ss, blkio_files, + ARRAY_SIZE(blkio_files)); +} + +struct cgroup_subsys blkio_cgroup_subsys = { + .name = "blkio", + .create = blkio_cgroup_create, + .destroy = blkio_cgroup_destroy, + .populate = blkio_cgroup_populate, + .subsys_id = blkio_cgroup_subsys_id, + .use_id = 1, +}; Index: linux-2.6.31/mm/page_cgroup.c =================================================================== --- linux-2.6.31.orig/mm/page_cgroup.c +++ linux-2.6.31/mm/page_cgroup.c @@ -9,6 +9,7 @@ #include #include #include +#include static void __meminit __init_page_cgroup(struct page_cgroup *pc, unsigned long pfn) @@ -16,6 +17,7 @@ __init_page_cgroup(struct page_cgroup *p pc->flags = 0; pc->page = pfn_to_page(pfn); __init_mem_page_cgroup(pc); + __init_blkio_page_cgroup(pc); } static unsigned long total_usage; @@ -73,7 +75,7 @@ void __init page_cgroup_init_flatmem(voi int nid, fail; - if (mem_cgroup_disabled()) + if (mem_cgroup_disabled() && blkio_cgroup_disabled()) return; for_each_online_node(nid) { @@ -82,12 +84,13 @@ void __init page_cgroup_init_flatmem(voi goto fail; } printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage); - printk(KERN_INFO "please try 'cgroup_disable=memory' option if you" - " don't want memory cgroups\n"); + printk(KERN_INFO "please try 'cgroup_disable=memory,blkio' option" + " if you don't want memory and blkio cgroups\n"); return; fail: printk(KERN_CRIT "allocation of page_cgroup failed.\n"); - printk(KERN_CRIT "please try 'cgroup_disable=memory' boot option\n"); + printk(KERN_CRIT + "please try 'cgroup_disable=memory,blkio' boot option\n"); panic("Out of memory"); } @@ -244,7 +247,7 @@ void __init page_cgroup_init(void) unsigned long pfn; int fail = 0; - if (mem_cgroup_disabled()) + if (mem_cgroup_disabled() && blkio_cgroup_disabled()) return; for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) { @@ -253,14 +256,15 @@ void __init page_cgroup_init(void) fail = init_section_page_cgroup(pfn); } if (fail) { - printk(KERN_CRIT "try 'cgroup_disable=memory' boot option\n"); + printk(KERN_CRIT + "try 'cgroup_disable=memory,blkio' boot option\n"); panic("Out of memory"); } else { hotplug_memory_notifier(page_cgroup_callback, 0); } printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage); - printk(KERN_INFO "please try 'cgroup_disable=memory' option if you don't" - " want memory cgroups\n"); + printk(KERN_INFO "please try 'cgroup_disable=memory,blkio' option" + " if you don't want memory and blkio cgroups\n"); } void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) Index: linux-2.6.31/mm/Makefile =================================================================== --- linux-2.6.31.orig/mm/Makefile +++ linux-2.6.31/mm/Makefile @@ -41,5 +41,6 @@ endif obj-$(CONFIG_QUICKLIST) += quicklist.o obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o obj-$(CONFIG_CGROUP_PAGE) += page_cgroup.o +obj-$(CONFIG_CGROUP_BLKIO) += biotrack.o obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o -- 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/