proc_rss.h

#ifndef PROC_RSS_H_
#define PROC_RSS_H_
//声明
//////////////////////////////////////////////////////////////////////////
#include <linux/pid.h>
#include <linux/ksm.h>
#include "ver_control.h"
MY_STATIC size_t read_proc_rss_size(struct pid* proc_pid_struct);

//实现
//////////////////////////////////////////////////////////////////////////
#include "proc_cmdline.h"
MY_STATIC size_t read_proc_rss_size(struct pid* proc_pid_struct) {
	struct task_struct *task;
	struct mm_struct *mm;
	task = pid_task(proc_pid_struct, PIDTYPE_PID);
	if (!task) {
		return 0;
	}
	mm = get_task_mm(task);
	if (mm) {
		//精确偏移
		size_t total_rss;
		ssize_t offset = g_init_arg_start_offset_success ? g_arg_start_offset_proc_cmdline : 0;
		struct mm_rss_stat *rss_stat = (struct mm_rss_stat *)((size_t)&mm->rss_stat + offset);
		ssize_t val1, val2, val3;

		printk_debug(KERN_INFO "&mm->rss_stat:%p,rss_stat:%zx\n", (void*)&mm->rss_stat, rss_stat);


		val1 = atomic_long_read(&rss_stat->count[MM_FILEPAGES]);
		val2 = atomic_long_read(&rss_stat->count[MM_ANONPAGES]);
#ifdef MM_SHMEMPAGES
		val3 = atomic_long_read(&rss_stat->count[MM_SHMEMPAGES]);
#else
		val3 = 0;
#endif
		if (val1 < 0) { val1 = 0; }
		if (val2 < 0) { val2 = 0; }
		if (val3 < 0) { val3 = 0; }
		total_rss = val1 + val2 + val3;
		mmput(mm);
		return total_rss;
	}
	return 0;

}
#endif /* PROC_RSS_H_ */