diff options
| -rw-r--r-- | include/linux/show_mem_notifier.h | 20 | ||||
| -rw-r--r-- | mm/Makefile | 3 | ||||
| -rw-r--r-- | mm/showmem.c | 54 |
3 files changed, 76 insertions, 1 deletions
diff --git a/include/linux/show_mem_notifier.h b/include/linux/show_mem_notifier.h new file mode 100644 index 000000000..b1265f87e --- /dev/null +++ b/include/linux/show_mem_notifier.h @@ -0,0 +1,20 @@ +/* + * 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); diff --git a/mm/Makefile b/mm/Makefile index 30e403700..ba25726ce 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -17,7 +17,8 @@ obj-y := filemap.o mempool.o oom_kill.o fadvise.o \ util.o mmzone.o vmstat.o backing-dev.o \ mm_init.o mmu_context.o percpu.o slab_common.o \ compaction.o balloon_compaction.o \ - interval_tree.o $(mmu-y) + interval_tree.o $(mmu-y) \ + showmem.o obj-y += init-mm.o diff --git a/mm/showmem.c b/mm/showmem.c new file mode 100644 index 000000000..ddad34ebb --- /dev/null +++ b/mm/showmem.c @@ -0,0 +1,54 @@ +/* + * 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); |