133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/*
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* slowpath_count.c
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*
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* count front and visible app into slow path page_alloc times.
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*
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* Copyright (c) 2001-2021, Huawei Tech. Co., Ltd. All rights reserved.
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*
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* Chenjun <chenjun@hisilicon.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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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*/
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#include <linux/cred.h>
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#include <linux/debugfs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/seq_file.h>
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#include <slowpath_count.h>
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#define FIRST_APP_UID KUIDT_INIT(10000)
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#define LAST_APP_UID KUIDT_INIT(19999)
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#define VISIBLE_APP_ADJ (1)
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#define FOREGROUND_APP_ADJ (0)
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static u64 last_jiffs;
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static pid_t prev_pid;
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static bool enable = false;
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atomic_long_t pgalloc_count = ATOMIC_LONG_INIT(0);
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atomic_long_t slowpath_pgalloc_count[ORDER_LIMIT] = {ATOMIC_LONG_INIT(0)};
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EXPORT_SYMBOL(slowpath_pgalloc_count);
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module_param_named(enable, enable, bool, S_IRUGO | S_IWUSR);
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static int is_background(void)
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{
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kuid_t uid;
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int adj;
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struct mm_struct *mm;
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adj = current->signal->oom_score_adj;
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mm = current->mm;
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/*lint -e666 -esym(666,*)*/
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uid = current_uid(); /*lint !e64 */
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/*lint +e666 +esym(666,*)*/
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if (!mm || uid_lt(uid, FIRST_APP_UID) || uid_gt(uid, LAST_APP_UID))
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return 1;
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if (adj != VISIBLE_APP_ADJ && adj != FOREGROUND_APP_ADJ)
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return 1;
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return 0;
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}
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/*
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* pgalloc_count_inc - count slow path page_alloc times
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* @is_slowpath: slow path or not
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* @order: page_order
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*
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* This function count slow path page_alloc times and total page_alloc times.
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*/
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void pgalloc_count_inc(bool is_slowpath, unsigned int order)
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{
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u64 jiffs = 0;
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if (!enable || is_background())
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return;
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if (is_slowpath) {
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jiffs = get_jiffies_64();
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if (current->pid != prev_pid ||
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time_after64(jiffs, last_jiffs + HZ)) {
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last_jiffs = get_jiffies_64();
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}
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/*sum up all the order larger than 4-order as one*/
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if (order > ORDER_LIMIT - 1)
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order = ORDER_LIMIT - 1;
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atomic_long_inc(&slowpath_pgalloc_count[order]);
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prev_pid = current->pid;
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} else {
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atomic_long_inc(&pgalloc_count);
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}
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}
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EXPORT_SYMBOL(pgalloc_count_inc);
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static int slowpath_count_show(struct seq_file *s, void *unused)
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{
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int i;
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long sum = 0;
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for (i = 0; i < ORDER_LIMIT; i++)
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sum += atomic_long_read(&slowpath_pgalloc_count[i]);
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seq_printf(s, "Total page alloc count:%ld\n",
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atomic_long_read(&pgalloc_count));
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seq_printf(s, "Total slow path page alloc count:%ld\n", sum);
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return 0;
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}
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static int slowpath_count_open(struct inode *inode, struct file *file)
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{
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return single_open(file, slowpath_count_show, NULL);
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}
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static const struct file_operations fops = {
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.owner = THIS_MODULE,
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.open = slowpath_count_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init slowpath_count_init(void)
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{
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debugfs_create_file("slowpath_count", 0444, NULL, NULL, &fops);
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return 0;
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}
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module_init(slowpath_count_init);
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MODULE_LICENSE("GPL");
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