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Commit 6c235ec6 authored by Laura Abbott's avatar Laura Abbott Committed by Liam Mark
Browse files

mm: Add notifier framework for showing memory 



There are many drivers in the kernel which can hold on
to lots of memory. It can be useful to dump out all those
drivers at key points in the kernel. Introduct a notifier
framework for dumping this information. When the notifiers
are called, drivers can dump out the state of any memory
they may be using.

Change-Id: Ifb2946964bf5d072552dd56d8d6dfdd794af6d84
Signed-off-by: default avatarLaura Abbott <lauraa@codeaurora.org>
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent e1ae659b

include/linux/show_mem_notifier.h

0 → 100644
+20 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2014, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only 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.

 */



#include <linux/notifier.h>



int show_mem_notifier_register(struct notifier_block *nb);



int show_mem_notifier_unregister(struct notifier_block *nb);



void show_mem_call_notifiers(void);

mm/Makefile

+1 −1
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@@ -39,7 +39,7 @@ obj-y := filemap.o mempool.o oom_kill.o \ 
			   mm_init.o mmu_context.o percpu.o slab_common.o \

			   compaction.o vmacache.o swap_slots.o \

			   interval_tree.o list_lru.o workingset.o \

			   debug.o $(mmu-y)

			   debug.o $(mmu-y) showmem.o



obj-y += init-mm.o

mm/showmem.c

0 → 100644
+54 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2014, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only 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.

 */



#include <linux/kernel.h>

#include <linux/notifier.h>

#include <linux/debugfs.h>

#include <linux/fs.h>

#include <linux/init.h>



BLOCKING_NOTIFIER_HEAD(show_mem_notifier);



int show_mem_notifier_register(struct notifier_block *nb)

{

	return blocking_notifier_chain_register(&show_mem_notifier, nb);

}



int show_mem_notifier_unregister(struct notifier_block *nb)

{

	return blocking_notifier_chain_unregister(&show_mem_notifier, nb);

}



void show_mem_call_notifiers(void)

{

	blocking_notifier_call_chain(&show_mem_notifier, 0, NULL);

}



static int show_mem_notifier_get(void *dat, u64 *val)

{

	show_mem_call_notifiers();

	*val = 0;

	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(show_mem_notifier_debug_ops, show_mem_notifier_get,

				NULL, "%llu\n");



int show_mem_notifier_debugfs_register(void)

{

	debugfs_create_file("show_mem_notifier", 0664, NULL, NULL,

				&show_mem_notifier_debug_ops);



	return 0;

}

late_initcall(show_mem_notifier_debugfs_register);