mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-31 18:09:19 +00:00
164 lines
3.9 KiB
C
164 lines
3.9 KiB
C
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#include <linux/debugfs.h>
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/huge_mm.h>
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#include <linux/mount.h>
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#include <linux/seq_file.h>
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#include <linux/highmem.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/mempolicy.h>
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#include <linux/rmap.h>
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#include <linux/swap.h>
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#include <linux/swapops.h>
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#include <asm/elf.h>
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#include <asm/uaccess.h>
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#include <asm/tlbflush.h>
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#include "internal.h"
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#include <linux/bootmem.h>
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#include <linux/kallsyms.h>
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static ssize_t
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read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos)
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{
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unsigned long pfn;
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struct page *page;
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char *kbuf;
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int ret = 0;
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ssize_t num_written = 0;
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int blocktype = 0, pagetype = 0;
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page = NULL;
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pfn = min_low_pfn + *ppos;
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/* Find a valid PFN or the start of a MAX_ORDER_NR_PAGES area */
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while (!pfn_valid(pfn) && (pfn & (MAX_ORDER_NR_PAGES - 1)) != 0)
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pfn++;
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//printk("pfn: %ld max_pfn: %ld\n", pfn, max_pfn);
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/* Find an allocated page */
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for (; pfn < max_pfn; pfn++) {
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/*
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* If the new page is in a new MAX_ORDER_NR_PAGES area,
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* validate the area as existing, skip it if not
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*/
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if ((pfn & (MAX_ORDER_NR_PAGES - 1)) == 0 && !pfn_valid(pfn)) {
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pfn += MAX_ORDER_NR_PAGES - 1;
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continue;
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}
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/* Check for holes within a MAX_ORDER area */
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if (!pfn_valid_within(pfn))
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continue;
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page = pfn_to_page(pfn);
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/* Catch situations where free pages have a bad ->order */
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if (page->order >= 0 && PageBuddy(page))
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printk(KERN_WARNING
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"PageOwner info inaccurate for PFN %lu\n",
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pfn);
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/* Stop search if page is allocated and has trace info */
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if (page->order >= 0 && page->trace.nr_entries) {
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//intk("stopped search at pfn: %ld\n", pfn);
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break;
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}
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}
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if (!pfn_valid(pfn))
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return 0;
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/*
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* If memory does not end at a SECTION_SIZE boundary, then
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* we might have a pfn_valid() above max_pfn
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*/
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if (pfn >= max_pfn)
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return 0;
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/* Record the next PFN to read in the file offset */
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*ppos = (pfn - min_low_pfn) + 1;
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kbuf = kmalloc(count, GFP_KERNEL);
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if (!kbuf)
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return -ENOMEM;
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//printk("page: %p\n", page);
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ret = snprintf(kbuf, count, "Page allocated via order %d, mask 0x%x\n",
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page->order, page->gfp_mask);
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if (ret >= count) {
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ret = -ENOMEM;
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goto out;
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}
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/* Print information relevant to grouping pages by mobility */
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blocktype = get_pageblock_migratetype(page);
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pagetype = allocflags_to_migratetype(page->gfp_mask);
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ret += snprintf(kbuf+ret, count-ret,
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"PFN %lu Block %lu type %d %s "
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"Flags %s%s%s%s%s%s%s%s%s%s%s%s\n",
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pfn,
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pfn >> pageblock_order,
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blocktype,
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blocktype != pagetype ? "Fallback" : " ",
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PageLocked(page) ? "K" : " ",
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PageError(page) ? "E" : " ",
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PageReferenced(page) ? "R" : " ",
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PageUptodate(page) ? "U" : " ",
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PageDirty(page) ? "D" : " ",
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PageLRU(page) ? "L" : " ",
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PageActive(page) ? "A" : " ",
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PageSlab(page) ? "S" : " ",
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PageWriteback(page) ? "W" : " ",
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PageCompound(page) ? "C" : " ",
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PageSwapCache(page) ? "B" : " ",
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PageMappedToDisk(page) ? "M" : " ");
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if (ret >= count) {
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ret = -ENOMEM;
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goto out;
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}
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num_written = ret;
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ret = snprint_stack_trace(kbuf + num_written, count - num_written,
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&page->trace, 0);
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if (ret >= count - num_written) {
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ret = -ENOMEM;
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goto out;
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}
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num_written += ret;
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ret = snprintf(kbuf + num_written, count - num_written, "\n");
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if (ret >= count - num_written) {
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ret = -ENOMEM;
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goto out;
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}
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num_written += ret;
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ret = num_written;
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if (copy_to_user(buf, kbuf, ret))
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ret = -EFAULT;
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out:
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kfree(kbuf);
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return ret;
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}
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static struct file_operations proc_page_owner_operations = {
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.read = read_page_owner,
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};
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static int __init pageowner_init(void)
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{
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struct dentry *dentry;
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dentry = debugfs_create_file("page_owner", S_IRUSR, NULL,
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NULL, &proc_page_owner_operations);
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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return 0;
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}
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module_init(pageowner_init)
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