1 // SPDX-License-Identifier: GPL-2.0
3  * mm/rss_threshold.c
8 #include <linux/mm.h>
9 #include <linux/sched/mm.h>
15 	struct mm_struct *mm = get_task_mm(task);  in proc_pid_rss()  local
18 	if (mm) {  in proc_pid_rss()
19 		total_rss = get_mm_rss(mm);  in proc_pid_rss()
20 		seq_printf(m, "VMRss:%lu KB\n", total_rss << (PAGE_SHIFT - 10));  in proc_pid_rss()
21 		mmput(mm);  in proc_pid_rss()
23 	return 0;  in proc_pid_rss()
26 void listen_rss_threshold(struct mm_struct *mm)  in listen_rss_threshold()  argument
30 	total_rss = get_mm_rss(mm);  in listen_rss_threshold()
32 	if (!(mm->owner) || mm->rss_threshold == 0)  in listen_rss_threshold()
35 	total_rss = total_rss  << (PAGE_SHIFT - 10);  in listen_rss_threshold()
37 	if (likely(total_rss <= mm->rss_threshold))  in listen_rss_threshold()
40 	if (mm->owner->comm)  in listen_rss_threshold()
42 				mm->owner->pid, mm->owner->comm,  in listen_rss_threshold()
44 				mm->rss_threshold);  in listen_rss_threshold()
47 				mm->owner->pid,  in listen_rss_threshold()
49 				mm->rss_threshold);  in listen_rss_threshold()
57 	struct mm_struct *mm = NULL;  in rss_threshold_write()  local
62 	err = kstrtoul_from_user(buf, count, 0, &rss_threshold);  in rss_threshold_write()
63 	if (err < 0)  in rss_threshold_write()
66 	mem_total = totalram_pages() << (PAGE_SHIFT - 10);  in rss_threshold_write()
67 	if (rss_threshold < 0 || rss_threshold > mem_total)  in rss_threshold_write()
68 		return -EINVAL;  in rss_threshold_write()
72 		return -ESRCH;  in rss_threshold_write()
74 	mm = get_task_mm(p);  in rss_threshold_write()
75 	if (mm) {  in rss_threshold_write()
76 		mm->rss_threshold = rss_threshold;  in rss_threshold_write()
77 		listen_rss_threshold(mm);  in rss_threshold_write()
78 		mmput(mm);  in rss_threshold_write()
88 	struct inode *inode = m->private;  in rss_threshold_show()
90 	struct mm_struct *mm = NULL;  in rss_threshold_show()  local
94 		return -ESRCH;  in rss_threshold_show()
96 	mm = get_task_mm(p);  in rss_threshold_show()
97 	if (mm) {  in rss_threshold_show()
98 		seq_printf(m, "Threshold:%lu KB\n", mm->rss_threshold);  in rss_threshold_show()
99 		mmput(mm);  in rss_threshold_show()
103 	return 0;  in rss_threshold_show()