kmemleak: Add the base support
This patch adds the base support for the kernel memory leak detector. It traces the memory allocation/freeing in a way similar to the Boehm's conservative garbage collector, the difference being that the unreferenced objects are not freed but only shown in /sys/kernel/debug/kmemleak. Enabling this feature introduces an overhead to memory allocations. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>hifive-unleashed-5.1
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/*
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* include/linux/kmemleak.h
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*
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* Copyright (C) 2008 ARM Limited
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* Written by Catalin Marinas <catalin.marinas@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __KMEMLEAK_H
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#define __KMEMLEAK_H
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#ifdef CONFIG_DEBUG_KMEMLEAK
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extern void kmemleak_init(void);
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extern void kmemleak_alloc(const void *ptr, size_t size, int min_count,
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gfp_t gfp);
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extern void kmemleak_free(const void *ptr);
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extern void kmemleak_padding(const void *ptr, unsigned long offset,
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size_t size);
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extern void kmemleak_not_leak(const void *ptr);
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extern void kmemleak_ignore(const void *ptr);
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extern void kmemleak_scan_area(const void *ptr, unsigned long offset,
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size_t length, gfp_t gfp);
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extern void kmemleak_no_scan(const void *ptr);
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static inline void kmemleak_alloc_recursive(const void *ptr, size_t size,
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int min_count, unsigned long flags,
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gfp_t gfp)
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{
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if (!(flags & SLAB_NOLEAKTRACE))
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kmemleak_alloc(ptr, size, min_count, gfp);
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}
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static inline void kmemleak_free_recursive(const void *ptr, unsigned long flags)
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{
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if (!(flags & SLAB_NOLEAKTRACE))
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kmemleak_free(ptr);
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}
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static inline void kmemleak_erase(void **ptr)
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{
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*ptr = NULL;
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}
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#else
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static inline void kmemleak_init(void)
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{
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}
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static inline void kmemleak_alloc(const void *ptr, size_t size, int min_count,
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gfp_t gfp)
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{
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}
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static inline void kmemleak_alloc_recursive(const void *ptr, size_t size,
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int min_count, unsigned long flags,
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gfp_t gfp)
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{
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}
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static inline void kmemleak_free(const void *ptr)
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{
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}
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static inline void kmemleak_free_recursive(const void *ptr, unsigned long flags)
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{
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}
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static inline void kmemleak_not_leak(const void *ptr)
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{
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}
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static inline void kmemleak_ignore(const void *ptr)
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{
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}
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static inline void kmemleak_scan_area(const void *ptr, unsigned long offset,
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size_t length, gfp_t gfp)
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{
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}
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static inline void kmemleak_erase(void **ptr)
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{
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}
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static inline void kmemleak_no_scan(const void *ptr)
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{
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}
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#endif /* CONFIG_DEBUG_KMEMLEAK */
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#endif /* __KMEMLEAK_H */
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@ -56,6 +56,7 @@
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#include <linux/debug_locks.h>
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#include <linux/debug_locks.h>
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#include <linux/debugobjects.h>
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#include <linux/debugobjects.h>
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#include <linux/lockdep.h>
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#include <linux/lockdep.h>
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#include <linux/kmemleak.h>
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#include <linux/pid_namespace.h>
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#include <linux/pid_namespace.h>
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#include <linux/device.h>
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#include <linux/device.h>
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#include <linux/kthread.h>
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#include <linux/kthread.h>
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@ -603,6 +604,7 @@ asmlinkage void __init start_kernel(void)
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/* init some links before init_ISA_irqs() */
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/* init some links before init_ISA_irqs() */
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early_irq_init();
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early_irq_init();
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init_IRQ();
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init_IRQ();
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prio_tree_init();
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pidhash_init();
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pidhash_init();
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init_timers();
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init_timers();
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hrtimers_init();
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hrtimers_init();
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@ -654,6 +656,7 @@ asmlinkage void __init start_kernel(void)
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cpu_hotplug_init();
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cpu_hotplug_init();
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kmem_cache_init();
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kmem_cache_init();
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kmemtrace_init();
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kmemtrace_init();
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kmemleak_init();
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debug_objects_mem_init();
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debug_objects_mem_init();
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idr_init_cache();
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idr_init_cache();
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setup_per_cpu_pageset();
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setup_per_cpu_pageset();
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@ -663,7 +666,6 @@ asmlinkage void __init start_kernel(void)
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calibrate_delay();
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calibrate_delay();
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pidmap_init();
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pidmap_init();
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pgtable_cache_init();
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pgtable_cache_init();
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prio_tree_init();
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anon_vma_init();
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anon_vma_init();
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#ifdef CONFIG_X86
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#ifdef CONFIG_X86
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if (efi_enabled)
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if (efi_enabled)
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