Contributors: 36
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Matthew Wilcox |
346 |
28.04% |
19 |
23.17% |
| Sasha Levin |
342 |
27.71% |
4 |
4.88% |
| Alexander Duyck |
152 |
12.32% |
2 |
2.44% |
| Vlastimil Babka |
146 |
11.83% |
9 |
10.98% |
| John Hubbard |
54 |
4.38% |
3 |
3.66% |
| Liam R. Howlett |
42 |
3.40% |
5 |
6.10% |
| Michal Hocko |
25 |
2.03% |
2 |
2.44% |
| HyeonggonYoo |
17 |
1.38% |
2 |
2.44% |
| Dave Hansen |
14 |
1.13% |
1 |
1.22% |
| Qian Cai |
11 |
0.89% |
2 |
2.44% |
| Kirill A. Shutemov |
10 |
0.81% |
5 |
6.10% |
| Johannes Weiner |
10 |
0.81% |
2 |
2.44% |
| David Hildenbrand |
9 |
0.73% |
2 |
2.44% |
| Suren Baghdasaryan |
5 |
0.41% |
1 |
1.22% |
| Davidlohr Bueso A |
5 |
0.41% |
1 |
1.22% |
| Robin Murphy |
4 |
0.32% |
1 |
1.22% |
| Nadav Amit |
4 |
0.32% |
1 |
1.22% |
| Balbir Singh |
3 |
0.24% |
1 |
1.22% |
| Andi Kleen |
3 |
0.24% |
2 |
2.44% |
| Hugh Dickins |
3 |
0.24% |
1 |
1.22% |
| JoonSoo Kim |
3 |
0.24% |
1 |
1.22% |
| Christoph Lameter |
3 |
0.24% |
1 |
1.22% |
| Linus Torvalds (pre-git) |
3 |
0.24% |
1 |
1.22% |
| Nicholas Piggin |
3 |
0.24% |
1 |
1.22% |
| Pavel Tatashin |
2 |
0.16% |
1 |
1.22% |
| Alistair Popple |
2 |
0.16% |
1 |
1.22% |
| Vegard Nossum |
2 |
0.16% |
1 |
1.22% |
| Andrew Morton |
2 |
0.16% |
1 |
1.22% |
| Jason Gunthorpe |
2 |
0.16% |
1 |
1.22% |
| Roman Gushchin |
1 |
0.08% |
1 |
1.22% |
| Steven Rostedt |
1 |
0.08% |
1 |
1.22% |
| Vladimir Davydov |
1 |
0.08% |
1 |
1.22% |
| Eric W. Biedermann |
1 |
0.08% |
1 |
1.22% |
| Alexey Dobriyan |
1 |
0.08% |
1 |
1.22% |
| Konstantin Khlebnikov |
1 |
0.08% |
1 |
1.22% |
| Greg Kroah-Hartman |
1 |
0.08% |
1 |
1.22% |
| Total |
1234 |
|
82 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* mm/debug.c
*
* mm/ specific debug routines.
*
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/trace_events.h>
#include <linux/memcontrol.h>
#include <trace/events/mmflags.h>
#include <linux/migrate.h>
#include <linux/page_owner.h>
#include <linux/ctype.h>
#include "internal.h"
#include <trace/events/migrate.h>
/*
* Define EM() and EMe() so that MIGRATE_REASON from trace/events/migrate.h can
* be used to populate migrate_reason_names[].
*/
#undef EM
#undef EMe
#define EM(a, b) b,
#define EMe(a, b) b
const char *migrate_reason_names[MR_TYPES] = {
MIGRATE_REASON
};
const struct trace_print_flags pageflag_names[] = {
__def_pageflag_names,
{0, NULL}
};
const struct trace_print_flags pagetype_names[] = {
__def_pagetype_names,
{0, NULL}
};
const struct trace_print_flags gfpflag_names[] = {
__def_gfpflag_names,
{0, NULL}
};
const struct trace_print_flags vmaflag_names[] = {
__def_vmaflag_names,
{0, NULL}
};
static void __dump_folio(struct folio *folio, struct page *page,
unsigned long pfn, unsigned long idx)
{
struct address_space *mapping = folio_mapping(folio);
int mapcount = atomic_read(&page->_mapcount);
char *type = "";
mapcount = page_type_has_type(mapcount) ? 0 : mapcount + 1;
pr_warn("page: refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n",
folio_ref_count(folio), mapcount, mapping,
folio->index + idx, pfn);
if (folio_test_large(folio)) {
pr_warn("head: order:%u mapcount:%d entire_mapcount:%d nr_pages_mapped:%d pincount:%d\n",
folio_order(folio),
folio_mapcount(folio),
folio_entire_mapcount(folio),
folio_nr_pages_mapped(folio),
atomic_read(&folio->_pincount));
}
#ifdef CONFIG_MEMCG
if (folio->memcg_data)
pr_warn("memcg:%lx\n", folio->memcg_data);
#endif
if (folio_test_ksm(folio))
type = "ksm ";
else if (folio_test_anon(folio))
type = "anon ";
else if (mapping)
dump_mapping(mapping);
BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
/*
* Accessing the pageblock without the zone lock. It could change to
* "isolate" again in the meantime, but since we are just dumping the
* state for debugging, it should be fine to accept a bit of
* inaccuracy here due to racing.
*/
pr_warn("%sflags: %pGp%s\n", type, &folio->flags,
is_migrate_cma_folio(folio, pfn) ? " CMA" : "");
if (page_has_type(&folio->page))
pr_warn("page_type: %pGt\n", &folio->page.page_type);
print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32,
sizeof(unsigned long), page,
sizeof(struct page), false);
if (folio_test_large(folio))
print_hex_dump(KERN_WARNING, "head: ", DUMP_PREFIX_NONE, 32,
sizeof(unsigned long), folio,
2 * sizeof(struct page), false);
}
static void __dump_page(const struct page *page)
{
struct folio *foliop, folio;
struct page precise;
unsigned long pfn = page_to_pfn(page);
unsigned long idx, nr_pages = 1;
int loops = 5;
again:
memcpy(&precise, page, sizeof(*page));
foliop = page_folio(&precise);
if (foliop == (struct folio *)&precise) {
idx = 0;
if (!folio_test_large(foliop))
goto dump;
foliop = (struct folio *)page;
} else {
idx = folio_page_idx(foliop, page);
}
if (idx < MAX_FOLIO_NR_PAGES) {
memcpy(&folio, foliop, 2 * sizeof(struct page));
nr_pages = folio_nr_pages(&folio);
foliop = &folio;
}
if (idx > nr_pages) {
if (loops-- > 0)
goto again;
pr_warn("page does not match folio\n");
precise.compound_head &= ~1UL;
foliop = (struct folio *)&precise;
idx = 0;
}
dump:
__dump_folio(foliop, &precise, pfn, idx);
}
void dump_page(const struct page *page, const char *reason)
{
if (PagePoisoned(page))
pr_warn("page:%p is uninitialized and poisoned", page);
else
__dump_page(page);
if (reason)
pr_warn("page dumped because: %s\n", reason);
dump_page_owner(page);
}
EXPORT_SYMBOL(dump_page);
#ifdef CONFIG_DEBUG_VM
void dump_vma(const struct vm_area_struct *vma)
{
pr_emerg("vma %px start %px end %px mm %px\n"
"prot %lx anon_vma %px vm_ops %px\n"
"pgoff %lx file %px private_data %px\n"
"flags: %#lx(%pGv)\n",
vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_mm,
(unsigned long)pgprot_val(vma->vm_page_prot),
vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
vma->vm_file, vma->vm_private_data,
vma->vm_flags, &vma->vm_flags);
}
EXPORT_SYMBOL(dump_vma);
void dump_mm(const struct mm_struct *mm)
{
pr_emerg("mm %px task_size %lu\n"
"mmap_base %lu mmap_legacy_base %lu\n"
"pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
"pinned_vm %llx data_vm %lx exec_vm %lx stack_vm %lx\n"
"start_code %lx end_code %lx start_data %lx end_data %lx\n"
"start_brk %lx brk %lx start_stack %lx\n"
"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
"binfmt %px flags %lx\n"
#ifdef CONFIG_AIO
"ioctx_table %px\n"
#endif
#ifdef CONFIG_MEMCG
"owner %px "
#endif
"exe_file %px\n"
#ifdef CONFIG_MMU_NOTIFIER
"notifier_subscriptions %px\n"
#endif
#ifdef CONFIG_NUMA_BALANCING
"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
#endif
"tlb_flush_pending %d\n"
"def_flags: %#lx(%pGv)\n",
mm, mm->task_size,
mm->mmap_base, mm->mmap_legacy_base,
mm->pgd, atomic_read(&mm->mm_users),
atomic_read(&mm->mm_count),
mm_pgtables_bytes(mm),
mm->map_count,
mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
(u64)atomic64_read(&mm->pinned_vm),
mm->data_vm, mm->exec_vm, mm->stack_vm,
mm->start_code, mm->end_code, mm->start_data, mm->end_data,
mm->start_brk, mm->brk, mm->start_stack,
mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
mm->binfmt, mm->flags,
#ifdef CONFIG_AIO
mm->ioctx_table,
#endif
#ifdef CONFIG_MEMCG
mm->owner,
#endif
mm->exe_file,
#ifdef CONFIG_MMU_NOTIFIER
mm->notifier_subscriptions,
#endif
#ifdef CONFIG_NUMA_BALANCING
mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
#endif
atomic_read(&mm->tlb_flush_pending),
mm->def_flags, &mm->def_flags
);
}
EXPORT_SYMBOL(dump_mm);
static bool page_init_poisoning __read_mostly = true;
static int __init setup_vm_debug(char *str)
{
bool __page_init_poisoning = true;
/*
* Calling vm_debug with no arguments is equivalent to requesting
* to enable all debugging options we can control.
*/
if (*str++ != '=' || !*str)
goto out;
__page_init_poisoning = false;
if (*str == '-')
goto out;
while (*str) {
switch (tolower(*str)) {
case'p':
__page_init_poisoning = true;
break;
default:
pr_err("vm_debug option '%c' unknown. skipped\n",
*str);
}
str++;
}
out:
if (page_init_poisoning && !__page_init_poisoning)
pr_warn("Page struct poisoning disabled by kernel command line option 'vm_debug'\n");
page_init_poisoning = __page_init_poisoning;
return 1;
}
__setup("vm_debug", setup_vm_debug);
void page_init_poison(struct page *page, size_t size)
{
if (page_init_poisoning)
memset(page, PAGE_POISON_PATTERN, size);
}
void vma_iter_dump_tree(const struct vma_iterator *vmi)
{
#if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
mas_dump(&vmi->mas);
mt_dump(vmi->mas.tree, mt_dump_hex);
#endif /* CONFIG_DEBUG_VM_MAPLE_TREE */
}
#endif /* CONFIG_DEBUG_VM */