Commit 3c7b4e6b authored by Catalin Marinas's avatar Catalin Marinas
Browse files

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: default avatarCatalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 991ec02c

include/linux/kmemleak.h

0 → 100644
+96 −0
Original line number Diff line number Diff line 
/*

 * include/linux/kmemleak.h

 *

 * Copyright (C) 2008 ARM Limited

 * Written by Catalin Marinas <catalin.marinas@arm.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

 */



#ifndef __KMEMLEAK_H

#define __KMEMLEAK_H



#ifdef CONFIG_DEBUG_KMEMLEAK



extern void kmemleak_init(void);

extern void kmemleak_alloc(const void *ptr, size_t size, int min_count,

			   gfp_t gfp);

extern void kmemleak_free(const void *ptr);

extern void kmemleak_padding(const void *ptr, unsigned long offset,

			     size_t size);

extern void kmemleak_not_leak(const void *ptr);

extern void kmemleak_ignore(const void *ptr);

extern void kmemleak_scan_area(const void *ptr, unsigned long offset,

			       size_t length, gfp_t gfp);

extern void kmemleak_no_scan(const void *ptr);



static inline void kmemleak_alloc_recursive(const void *ptr, size_t size,

					    int min_count, unsigned long flags,

					    gfp_t gfp)

{

	if (!(flags & SLAB_NOLEAKTRACE))

		kmemleak_alloc(ptr, size, min_count, gfp);

}



static inline void kmemleak_free_recursive(const void *ptr, unsigned long flags)

{

	if (!(flags & SLAB_NOLEAKTRACE))

		kmemleak_free(ptr);

}



static inline void kmemleak_erase(void **ptr)

{

	*ptr = NULL;

}



#else



static inline void kmemleak_init(void)

{

}

static inline void kmemleak_alloc(const void *ptr, size_t size, int min_count,

				  gfp_t gfp)

{

}

static inline void kmemleak_alloc_recursive(const void *ptr, size_t size,

					    int min_count, unsigned long flags,

					    gfp_t gfp)

{

}

static inline void kmemleak_free(const void *ptr)

{

}

static inline void kmemleak_free_recursive(const void *ptr, unsigned long flags)

{

}

static inline void kmemleak_not_leak(const void *ptr)

{

}

static inline void kmemleak_ignore(const void *ptr)

{

}

static inline void kmemleak_scan_area(const void *ptr, unsigned long offset,

				      size_t length, gfp_t gfp)

{

}

static inline void kmemleak_erase(void **ptr)

{

}

static inline void kmemleak_no_scan(const void *ptr)

{

}



#endif	/* CONFIG_DEBUG_KMEMLEAK */



#endif	/* __KMEMLEAK_H */

init/main.c

+3 −1
Original line number Diff line number Diff line
@@ -56,6 +56,7 @@ 
#include <linux/debug_locks.h>

#include <linux/debugobjects.h>

#include <linux/lockdep.h>

#include <linux/kmemleak.h>

#include <linux/pid_namespace.h>

#include <linux/device.h>

#include <linux/kthread.h>
@@ -603,6 +604,7 @@ asmlinkage void __init start_kernel(void) 
	/* init some links before init_ISA_irqs() */

	early_irq_init();

	init_IRQ();

	prio_tree_init();

	pidhash_init();

	init_timers();

	hrtimers_init();
@@ -654,6 +656,7 @@ asmlinkage void __init start_kernel(void) 
	cpu_hotplug_init();

	kmem_cache_init();

	kmemtrace_init();

	kmemleak_init();

	debug_objects_mem_init();

	idr_init_cache();

	setup_per_cpu_pageset();
@@ -663,7 +666,6 @@ asmlinkage void __init start_kernel(void) 
	calibrate_delay();

	pidmap_init();

	pgtable_cache_init();

	prio_tree_init();

	anon_vma_init();

#ifdef CONFIG_X86

	if (efi_enabled)

mm/kmemleak.c

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+1498 −0

File added.

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