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be7c701fd4
Move the PagePoisoned test into dump_page(). Skip the hex print for poisoned pages -- we know they're full of ffffffff. Move the reason printing from __dump_page() to dump_page(). Link: https://lkml.kernel.org/r/20210416231531.2521383-3-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
314 lines
8.2 KiB
C
314 lines
8.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* mm/debug.c
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*
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* mm/ specific debug routines.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/trace_events.h>
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#include <linux/memcontrol.h>
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#include <trace/events/mmflags.h>
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#include <linux/migrate.h>
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#include <linux/page_owner.h>
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#include <linux/ctype.h>
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#include "internal.h"
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const char *migrate_reason_names[MR_TYPES] = {
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"compaction",
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"memory_failure",
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"memory_hotplug",
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"syscall_or_cpuset",
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"mempolicy_mbind",
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"numa_misplaced",
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"cma",
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};
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const struct trace_print_flags pageflag_names[] = {
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__def_pageflag_names,
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{0, NULL}
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};
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const struct trace_print_flags gfpflag_names[] = {
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__def_gfpflag_names,
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{0, NULL}
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};
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const struct trace_print_flags vmaflag_names[] = {
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__def_vmaflag_names,
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{0, NULL}
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};
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static void __dump_page(struct page *page)
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{
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struct page *head = compound_head(page);
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struct address_space *mapping;
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bool compound = PageCompound(page);
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/*
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* Accessing the pageblock without the zone lock. It could change to
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* "isolate" again in the meantime, but since we are just dumping the
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* state for debugging, it should be fine to accept a bit of
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* inaccuracy here due to racing.
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*/
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bool page_cma = is_migrate_cma_page(page);
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int mapcount;
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char *type = "";
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if (page < head || (page >= head + MAX_ORDER_NR_PAGES)) {
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/*
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* Corrupt page, so we cannot call page_mapping. Instead, do a
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* safe subset of the steps that page_mapping() does. Caution:
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* this will be misleading for tail pages, PageSwapCache pages,
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* and potentially other situations. (See the page_mapping()
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* implementation for what's missing here.)
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*/
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unsigned long tmp = (unsigned long)page->mapping;
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if (tmp & PAGE_MAPPING_ANON)
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mapping = NULL;
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else
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mapping = (void *)(tmp & ~PAGE_MAPPING_FLAGS);
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head = page;
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compound = false;
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} else {
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mapping = page_mapping(page);
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}
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/*
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* Avoid VM_BUG_ON() in page_mapcount().
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* page->_mapcount space in struct page is used by sl[aou]b pages to
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* encode own info.
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*/
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mapcount = PageSlab(head) ? 0 : page_mapcount(page);
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pr_warn("page:%p refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n",
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page, page_ref_count(head), mapcount, mapping,
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page_to_pgoff(page), page_to_pfn(page));
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if (compound) {
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if (hpage_pincount_available(page)) {
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pr_warn("head:%p order:%u compound_mapcount:%d compound_pincount:%d\n",
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head, compound_order(head),
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head_compound_mapcount(head),
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head_compound_pincount(head));
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} else {
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pr_warn("head:%p order:%u compound_mapcount:%d\n",
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head, compound_order(head),
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head_compound_mapcount(head));
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}
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}
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#ifdef CONFIG_MEMCG
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if (head->memcg_data)
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pr_warn("memcg:%lx\n", head->memcg_data);
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#endif
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if (PageKsm(page))
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type = "ksm ";
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else if (PageAnon(page))
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type = "anon ";
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else if (mapping) {
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struct inode *host;
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const struct address_space_operations *a_ops;
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struct hlist_node *dentry_first;
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struct dentry *dentry_ptr;
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struct dentry dentry;
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unsigned long ino;
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/*
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* mapping can be invalid pointer and we don't want to crash
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* accessing it, so probe everything depending on it carefully
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*/
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if (get_kernel_nofault(host, &mapping->host) ||
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get_kernel_nofault(a_ops, &mapping->a_ops)) {
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pr_warn("failed to read mapping contents, not a valid kernel address?\n");
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goto out_mapping;
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}
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if (!host) {
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pr_warn("aops:%ps\n", a_ops);
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goto out_mapping;
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}
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if (get_kernel_nofault(dentry_first, &host->i_dentry.first) ||
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get_kernel_nofault(ino, &host->i_ino)) {
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pr_warn("aops:%ps with invalid host inode %px\n",
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a_ops, host);
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goto out_mapping;
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}
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if (!dentry_first) {
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pr_warn("aops:%ps ino:%lx\n", a_ops, ino);
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goto out_mapping;
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}
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dentry_ptr = container_of(dentry_first, struct dentry, d_u.d_alias);
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if (get_kernel_nofault(dentry, dentry_ptr)) {
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pr_warn("aops:%ps ino:%lx with invalid dentry %px\n",
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a_ops, ino, dentry_ptr);
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} else {
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/*
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* if dentry is corrupted, the %pd handler may still
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* crash, but it's unlikely that we reach here with a
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* corrupted struct page
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*/
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pr_warn("aops:%ps ino:%lx dentry name:\"%pd\"\n",
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a_ops, ino, &dentry);
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}
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}
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out_mapping:
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BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
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pr_warn("%sflags: %#lx(%pGp)%s\n", type, head->flags, &head->flags,
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page_cma ? " CMA" : "");
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print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32,
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sizeof(unsigned long), page,
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sizeof(struct page), false);
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if (head != page)
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print_hex_dump(KERN_WARNING, "head: ", DUMP_PREFIX_NONE, 32,
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sizeof(unsigned long), head,
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sizeof(struct page), false);
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}
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void dump_page(struct page *page, const char *reason)
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{
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if (PagePoisoned(page))
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pr_warn("page:%p is uninitialized and poisoned", page);
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else
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__dump_page(page);
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if (reason)
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pr_warn("page dumped because: %s\n", reason);
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dump_page_owner(page);
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}
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EXPORT_SYMBOL(dump_page);
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#ifdef CONFIG_DEBUG_VM
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void dump_vma(const struct vm_area_struct *vma)
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{
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pr_emerg("vma %px start %px end %px\n"
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"next %px prev %px mm %px\n"
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"prot %lx anon_vma %px vm_ops %px\n"
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"pgoff %lx file %px private_data %px\n"
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"flags: %#lx(%pGv)\n",
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vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
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vma->vm_prev, vma->vm_mm,
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(unsigned long)pgprot_val(vma->vm_page_prot),
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vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
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vma->vm_file, vma->vm_private_data,
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vma->vm_flags, &vma->vm_flags);
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}
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EXPORT_SYMBOL(dump_vma);
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void dump_mm(const struct mm_struct *mm)
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{
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pr_emerg("mm %px mmap %px seqnum %llu task_size %lu\n"
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#ifdef CONFIG_MMU
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"get_unmapped_area %px\n"
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#endif
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"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
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"pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
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"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
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"pinned_vm %llx data_vm %lx exec_vm %lx stack_vm %lx\n"
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"start_code %lx end_code %lx start_data %lx end_data %lx\n"
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"start_brk %lx brk %lx start_stack %lx\n"
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"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
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"binfmt %px flags %lx core_state %px\n"
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#ifdef CONFIG_AIO
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"ioctx_table %px\n"
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#endif
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#ifdef CONFIG_MEMCG
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"owner %px "
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#endif
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"exe_file %px\n"
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#ifdef CONFIG_MMU_NOTIFIER
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"notifier_subscriptions %px\n"
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#endif
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#ifdef CONFIG_NUMA_BALANCING
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"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
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#endif
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"tlb_flush_pending %d\n"
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"def_flags: %#lx(%pGv)\n",
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mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size,
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#ifdef CONFIG_MMU
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mm->get_unmapped_area,
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#endif
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mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
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mm->pgd, atomic_read(&mm->mm_users),
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atomic_read(&mm->mm_count),
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mm_pgtables_bytes(mm),
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mm->map_count,
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mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
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(u64)atomic64_read(&mm->pinned_vm),
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mm->data_vm, mm->exec_vm, mm->stack_vm,
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mm->start_code, mm->end_code, mm->start_data, mm->end_data,
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mm->start_brk, mm->brk, mm->start_stack,
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mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
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mm->binfmt, mm->flags, mm->core_state,
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#ifdef CONFIG_AIO
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mm->ioctx_table,
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#endif
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#ifdef CONFIG_MEMCG
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mm->owner,
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#endif
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mm->exe_file,
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#ifdef CONFIG_MMU_NOTIFIER
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mm->notifier_subscriptions,
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#endif
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#ifdef CONFIG_NUMA_BALANCING
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mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
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#endif
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atomic_read(&mm->tlb_flush_pending),
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mm->def_flags, &mm->def_flags
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);
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}
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static bool page_init_poisoning __read_mostly = true;
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static int __init setup_vm_debug(char *str)
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{
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bool __page_init_poisoning = true;
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/*
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* Calling vm_debug with no arguments is equivalent to requesting
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* to enable all debugging options we can control.
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*/
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if (*str++ != '=' || !*str)
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goto out;
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__page_init_poisoning = false;
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if (*str == '-')
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goto out;
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while (*str) {
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switch (tolower(*str)) {
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case'p':
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__page_init_poisoning = true;
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break;
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default:
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pr_err("vm_debug option '%c' unknown. skipped\n",
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*str);
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}
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str++;
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}
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out:
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if (page_init_poisoning && !__page_init_poisoning)
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pr_warn("Page struct poisoning disabled by kernel command line option 'vm_debug'\n");
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page_init_poisoning = __page_init_poisoning;
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return 1;
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}
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__setup("vm_debug", setup_vm_debug);
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void page_init_poison(struct page *page, size_t size)
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{
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if (page_init_poisoning)
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memset(page, PAGE_POISON_PATTERN, size);
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}
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EXPORT_SYMBOL_GPL(page_init_poison);
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#endif /* CONFIG_DEBUG_VM */
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