Messages in this thread Patch in this message | | | From | Catalin Marinas <> | Subject | [PATCH 2.6.20-rc1 09/10] Testing module for kmemleak | Date | Sat, 16 Dec 2006 15:35:54 +0000 |
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This patch adds a loadable module that deliberately leaks memory. It is used for testing various memory leaking scenarios.
Signed-off-by: Catalin Marinas <catalin.marinas@gmail.com> ---
lib/Kconfig.debug | 11 ++++++ mm/Makefile | 1 + mm/memleak-test.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 106 insertions(+), 0 deletions(-)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 9695af1..b430479 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -263,6 +263,17 @@ config DEBUG_KEEP_INIT If unsure, say N. +config DEBUG_MEMLEAK_TEST + tristate "Test the kernel memory leak detector" + default n + depends on DEBUG_MEMLEAK + help + Say Y or M here to build the test harness for the kernel + memory leak detector. At the moment, this option enables a + module that explicitly leaks memory. + + If unsure, say N. + config DEBUG_PREEMPT bool "Debug preemptible kernel" depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT diff --git a/mm/Makefile b/mm/Makefile index aafe03f..9f5d450 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -30,3 +30,4 @@ obj-$(CONFIG_FS_XIP) += filemap_xip.o obj-$(CONFIG_MIGRATION) += migrate.o obj-$(CONFIG_SMP) += allocpercpu.o obj-$(CONFIG_DEBUG_MEMLEAK) += memleak.o +obj-$(CONFIG_DEBUG_MEMLEAK_TEST) += memleak-test.o diff --git a/mm/memleak-test.c b/mm/memleak-test.c new file mode 100644 index 0000000..51320d8 --- /dev/null +++ b/mm/memleak-test.c @@ -0,0 +1,94 @@ +/* + * mm/memleak-test.c + * + * Copyright (C) 2006 ARM Limited + * Written by Catalin Marinas <catalin.marinas@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/list.h> +#include <linux/percpu.h> + +#include <linux/memleak.h> + +struct test_node { + long header[25]; + struct list_head list; + long footer[25]; +}; + +static LIST_HEAD(test_list); +static DEFINE_PER_CPU(void *, test_pointer); + +/* Some very simple testing. This function needs to be extended for + * proper testing */ +static int __init memleak_test_init(void) +{ + struct test_node *elem; + int i; + + printk(KERN_INFO "KMemLeak testing\n"); + + /* make some orphan objects */ + kmalloc(32, GFP_KERNEL); + kmalloc(32, GFP_KERNEL); + kmalloc(1024, GFP_KERNEL); + kmalloc(1024, GFP_KERNEL); + kmalloc(2048, GFP_KERNEL); + kmalloc(2048, GFP_KERNEL); + kmalloc(4096, GFP_KERNEL); + kmalloc(4096, GFP_KERNEL); +#ifndef CONFIG_MODULES + kmem_cache_alloc(files_cachep, GFP_KERNEL); + kmem_cache_alloc(files_cachep, GFP_KERNEL); +#endif + vmalloc(64); + vmalloc(64); + + /* add elements to a list. They should only appear as orphan + * after the module is removed */ + for (i = 0; i < 10; i++) { + elem = kmalloc(sizeof(*elem), GFP_KERNEL); + if (!elem) + return -ENOMEM; + memset(elem, 0, sizeof(*elem)); + INIT_LIST_HEAD(&elem->list); + + list_add_tail(&elem->list, &test_list); + } + + for_each_possible_cpu(i) + per_cpu(test_pointer, i) = kmalloc(129, GFP_KERNEL); + + return 0; +} +module_init(memleak_test_init); + +static void __exit memleak_test_exit(void) +{ + struct test_node *elem, *tmp; + + /* remove the list elements without actually freeing the memory */ + list_for_each_entry_safe(elem, tmp, &test_list, list) + list_del(&elem->list); +} +module_exit(memleak_test_exit); + +MODULE_LICENSE("GPL"); - 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/
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