// 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 gfpflag_names[] = { __def_gfpflag_names, {0, NULL}}; const struct trace_print_flags vmaflag_names[] = { __def_vmaflag_names, {0, NULL}}; #define DEF_PAGETYPE_NAME(_name) [PGTY_##_name - 0xf0] = __stringify(_name) static const char *page_type_names[] = { DEF_PAGETYPE_NAME(slab), DEF_PAGETYPE_NAME(hugetlb), DEF_PAGETYPE_NAME(offline), DEF_PAGETYPE_NAME(guard), DEF_PAGETYPE_NAME(table), DEF_PAGETYPE_NAME(buddy), DEF_PAGETYPE_NAME(unaccepted),}; static const char *page_type_name(unsigned int page_type){ unsigned i = (page_type >> 24) - 0xf0; if (i >= ARRAY_SIZE(page_type_names)) return "unknown"; return page_type_names[i];} 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_mapcount_is_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: %x(%s)\n", folio->page.page_type >> 24, page_type_name(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 */
// 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 gfpflag_names[] = {
__def_gfpflag_names,
{0, NULL}
};
const struct trace_print_flags vmaflag_names[] = {
__def_vmaflag_names,
{0, NULL}
};
#define DEF_PAGETYPE_NAME(_name) [PGTY_##_name - 0xf0] = __stringify(_name)
static const char *page_type_names[] = {
DEF_PAGETYPE_NAME(slab),
DEF_PAGETYPE_NAME(hugetlb),
DEF_PAGETYPE_NAME(offline),
DEF_PAGETYPE_NAME(guard),
DEF_PAGETYPE_NAME(table),
DEF_PAGETYPE_NAME(buddy),
DEF_PAGETYPE_NAME(unaccepted),
};
static const char *page_type_name(unsigned int page_type)
{
unsigned i = (page_type >> 24) - 0xf0;
if (i >= ARRAY_SIZE(page_type_names))
return "unknown";
return page_type_names[i];
}
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_mapcount_is_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: %x(%s)\n", folio->page.page_type >> 24,
page_type_name(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 */