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#include <linux/init.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/pid.h>
#include <asm/uaccess.h>
#include <asm/current.h>
#include <linux/mm.h>
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("userspace process memory info device");
struct user_process_mem_info {
unsigned long vss;
unsigned long rss;
unsigned long rss_mapped;
unsigned long pss;
unsigned long uss;
int task_pid;
};
static int memoryinfo_flag = 0;
static pte_t check_pte(struct mm_struct *mm, unsigned long address)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pgd = pgd_offset(mm, address);
if (!pgd_present(*pgd))
goto check_fail;
pud = pud_offset(pgd, address);
if (!pud_present(*pud))
goto check_fail;
pmd = pmd_offset(pud, address);
if (!pmd_present(*pmd))
goto check_fail;
if (pmd_trans_huge(*pmd))
goto check_fail;
pte = pte_offset_map(pmd, address);
if (!pte_present(*pte))
goto check_fail;
return *pte;
check_fail:
return 0;
}
static struct page *check_pfn(pte_t pte)
{
if (!pte_pfn(pte))
return NULL;
else
return pfn_to_page(pte_pfn(pte));
}
int get_userprocess_meminfo(struct task_struct* p, struct user_process_mem_info *upmeminfo)
{
struct vm_area_struct *vma = NULL;
if (p->mm == NULL)
return -1;
upmeminfo->task_pid = p->pid;
for (vma = p->mm->mmap; vma; vma = vma->vm_next) {
unsigned long pagesize = PAGE_SIZE;
unsigned long step = vma->vm_start;
for(; step < vma->vm_end; step += pagesize) {
pte_t pte;
int mapcount;
struct page *page;
/*!!! VSS in procrank equals rss, and actually wrong !!!*/
upmeminfo->vss += pagesize; /*vss*/
pte = check_pte(p->mm, step);
if(!pte) continue;
page = check_pfn(pte);
if(!page) continue;
/*!!! RSS in procrank equals rss_mapped, and actually wrong !!!*/
upmeminfo->rss += pagesize; /*rss*/
mapcount = page_mapcount(page);
if(2 <= mapcount) {
upmeminfo->rss_mapped += pagesize; /*rss_mapped*/
upmeminfo->pss += pagesize / mapcount; /*pss*/
} else if (1 == mapcount) {
upmeminfo->rss_mapped += pagesize; /*rss_mapped*/
upmeminfo->pss += pagesize; /*pss*/
upmeminfo->uss += pagesize; /*uss*/
} else if (0 == mapcount) {
/*this is the difference between rss & rss_mapped.*/
}
}
}
return 0;
}
int user_process_meminfo_show(void)
{
struct task_struct *p = NULL;
struct user_process_mem_info upmeminfo;
printk(KERN_INFO "%5s %11s %9s %11s %9s %9s %s\n",
"pid", "vss", "rss", "rss_mapped", "pss", "uss", "name");
printk(KERN_INFO "-----------------------------------------------------------------\n");
for_each_process(p) {
memset(&upmeminfo, 0, sizeof(upmeminfo));
if (get_userprocess_meminfo(p, &upmeminfo))
continue;
printk(KERN_INFO "%5d %10luK %8luK %10luK %8luK %8luK %s\n",
upmeminfo.task_pid,
upmeminfo.vss >> 10,
upmeminfo.rss >> 10,
upmeminfo.rss_mapped >> 10,
upmeminfo.pss >> 10,
upmeminfo.uss >> 10,
p->comm);
}
return 0;
}
static int proc_user_process_meminfo_show(struct seq_file *m, void *v)
{
struct task_struct *p = NULL;
struct user_process_mem_info upmeminfo;
seq_printf(m, "%5s %11s %9s %11s %9s %9s %s\n",
"pid", "vss", "rss", "rss_mapped", "pss", "uss", "name");
seq_printf(m, "-----------------------------------------------------------------\n");
for_each_process(p) {
memset(&upmeminfo, 0, sizeof(upmeminfo));
if (get_userprocess_meminfo(p, &upmeminfo))
continue;
seq_printf(m, "%5d %10luK %8luK %10luK %8luK %8luK %s\n",
upmeminfo.task_pid,
upmeminfo.vss >> 10,
upmeminfo.rss >> 10,
upmeminfo.rss_mapped >> 10,
upmeminfo.pss >> 10,
upmeminfo.uss >> 10,
p->comm);
}
return 0;
}
static int proc_user_process_meminfo_open(struct inode *inode, struct file *file)
{
return single_open(file, proc_user_process_meminfo_show, NULL);
}
struct file_operations user_process_meminfo_fops = {
.open = proc_user_process_meminfo_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
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