Small modification to linux kernel (v3.13.0) that adds *which* pages have been accessed to the /proc/pid/smaps interface

task_mmu.patch

267c267,269
< 		struct inode *inode = file_inode(vma->vm_file);
---
> 		struct inode *inode;
> 		file = vma_pr_or_file(vma);
> 		inode = file_inode(file);
440a443,457
> #define MAX_REF_BUFF	    4096
> #define END_OF_REF_BUFFER   -1
> static unsigned long *referenced_list;
> static int reference_pos;
> static int add_to_referenced_list(unsigned long addr) {
> 	if (!referenced_list) { 
> 		printk("<1> ERROR REFERENCED LIST DOES NOT EXIST YET.\n");
> 	}
> 	referenced_list[reference_pos++] = addr;
> 	if (reference_pos >= MAX_REF_BUFF) {
> 		return END_OF_REF_BUFFER;
> 	}
> 	return reference_pos;
> }
> 
475c492
< 	if (pte_young(ptent) || PageReferenced(page))
---
> 	if (pte_young(ptent) || PageReferenced(page)) {
476a494,495
> 		add_to_referenced_list(addr);
>         }
519a539
> 	
587a608,615
> 	int i = 0;
> 
> 	referenced_list = (unsigned long *) kmalloc(MAX_REF_BUFF, GFP_TEMPORARY);
> 	if (!referenced_list) {
> 		printk("<1>ERROR ALLOCATING MEMORY FOR REFERENCED LIST\n");
> 		return -1;
> 	}
> 	reference_pos = 0;
596a625,632
> 
> 	seq_printf(m, "Ref_Addrs:      [");
> 	for (i = 0; i < reference_pos; i++) {
> 		seq_printf(m, "%lx,", referenced_list[i]);
> 	}
> 	seq_printf(m, "]\n");
> 
> 
636a673,675
> 	if (referenced_list) {
> 		kfree(referenced_list);
> 	}
892c931,935
< #define __PM_SOFT_DIRTY      (1LL)
---
> #define __PM_SOFT_DIRTY     (1LL)
> /* F0215-------------------------------------------------------------------- */
> #define __PM_YOUNG	    (1LL << 60)
> /* ------------------------------------------------------------------------- */
> 
912a956,959
> /* F0215 ------------------------------------------------------------------- */
> //static int add_to_ref_list(unsigned long addr, void *buffer, 
> /* ------------------------------------------------------------------------- */
> 
939a987,991
> 		/* F0215----------------------------------------------------- */
> 		if (pte_young(pte) || PageReferenced(page)) {
> 			flags |= __PM_YOUNG;
> 		}
> 		/* ---------------------------------------------------------- */
952a1005,1009
> 		/* F0215----------------------------------------------------- */
> 		//if (pte_young(pte)) {
> 			flags = __PM_YOUNG;
> 		//}
> 		/* ---------------------------------------------------------- */
955c1012
< 		*pme = make_pme(PM_NOT_PRESENT(pm->v2) | PM_STATUS2(pm->v2, flags2));
---
> 		*pme = make_pme(PM_NOT_PRESENT(pm->v2) | PM_STATUS2(pm->v2, flags2)/* F0215- */| flags/* -- */);
1353c1410
< 	if (pte_none(*pte))
---
> 	if (!pte_present(*pte))
1409a1467
> 		file = vma_pr_or_file(vma);