62 lines
1.4 KiB
C
Executable file
62 lines
1.4 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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/*
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* sec_mm/
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*
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* Copyright (C) 2020 Samsung Electronics
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*
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/ratelimit.h>
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#include "sec_mm.h"
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static DEFINE_RATELIMIT_STATE(mm_debug_rs, 10 * HZ, 1);
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#define MIN_FILE_SIZE_HIGH 300
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#define MIN_FILE_SIZE_LOW 200
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#define MIN_FILE_SIZE_THR_GB 3
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static unsigned long min_file;
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static unsigned long lowfile_count(struct shrinker *s,
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struct shrink_control *sc)
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{
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unsigned long inactive_file, active_file, file;
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inactive_file = global_node_page_state(NR_INACTIVE_FILE);
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active_file = global_node_page_state(NR_ACTIVE_FILE);
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file = inactive_file + active_file;
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if (file < min_file && __ratelimit(&mm_debug_rs)) {
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pr_info("low file detected : %lukB < %luKB\n", K(file),
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K(min_file));
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#ifdef CONFIG_SEC_MM
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show_mem(0, NULL);
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#else
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mm_debug_show_free_areas();
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#endif
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mm_debug_dump_tasks();
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}
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return 0; /* return 0 not to call to scan_objects */
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}
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static struct shrinker mm_debug_shrinker = {
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.count_objects = lowfile_count,
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};
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void init_lowfile_detect(void)
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{
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if (totalram_pages() > GB_TO_PAGES(MIN_FILE_SIZE_THR_GB))
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min_file = MB_TO_PAGES(MIN_FILE_SIZE_HIGH);
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else
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min_file = MB_TO_PAGES(MIN_FILE_SIZE_LOW);
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register_shrinker(&mm_debug_shrinker);
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}
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void exit_lowfile_detect(void)
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{
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unregister_shrinker(&mm_debug_shrinker);
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}
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MODULE_LICENSE("GPL");
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