diff options
Diffstat (limited to 'mm/debug.c')
| -rw-r--r-- | mm/debug.c | 142 |
1 files changed, 102 insertions, 40 deletions
diff --git a/mm/debug.c b/mm/debug.c index aa57d3ffd4ed..77fa8fe1d641 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -67,24 +67,31 @@ static const char *page_type_name(unsigned int page_type) return page_type_names[i]; } -static void __dump_folio(struct folio *folio, struct page *page, +static void __dump_folio(const struct folio *folio, const struct page *page, unsigned long pfn, unsigned long idx) { struct address_space *mapping = folio_mapping(folio); - int mapcount = atomic_read(&page->_mapcount); + int mapcount = atomic_read(&page->_mapcount) + 1; char *type = ""; - mapcount = page_mapcount_is_type(mapcount) ? 0 : mapcount + 1; + if (page_mapcount_is_type(mapcount)) + mapcount = 0; + 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)) { + int pincount = 0; + + if (folio_has_pincount(folio)) + pincount = atomic_read(&folio->_pincount); + 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)); + pincount); } #ifdef CONFIG_MEMCG @@ -122,47 +129,19 @@ static void __dump_folio(struct folio *folio, struct page *page, 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); - } + struct page_snapshot ps; - 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; + snapshot_page(&ps, page); + if (!snapshot_page_is_faithful(&ps)) 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); + __dump_folio(&ps.folio_snapshot, &ps.page_snapshot, ps.pfn, ps.idx); } void dump_page(const struct page *page, const char *reason) { if (PagePoisoned(page)) - pr_warn("page:%p is uninitialized and poisoned", page); + pr_warn("page:%p is uninitialized and poisoned\n", page); else __dump_page(page); if (reason) @@ -178,11 +157,17 @@ 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" +#ifdef CONFIG_PER_VMA_LOCK + "refcnt %x\n" +#endif "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, +#ifdef CONFIG_PER_VMA_LOCK + refcount_read(&vma->vm_refcnt), +#endif vma->vm_flags, &vma->vm_flags); } EXPORT_SYMBOL(dump_vma); @@ -197,7 +182,7 @@ void dump_mm(const struct mm_struct *mm) "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" + "binfmt %px flags %*pb\n" #ifdef CONFIG_AIO "ioctx_table %px\n" #endif @@ -226,7 +211,7 @@ void dump_mm(const struct mm_struct *mm) 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, + mm->binfmt, NUM_MM_FLAG_BITS, __mm_flags_get_bitmap(mm), #ifdef CONFIG_AIO mm->ioctx_table, #endif @@ -246,6 +231,83 @@ void dump_mm(const struct mm_struct *mm) } EXPORT_SYMBOL(dump_mm); +void dump_vmg(const struct vma_merge_struct *vmg, const char *reason) +{ + if (reason) + pr_warn("vmg %px dumped because: %s\n", vmg, reason); + + if (!vmg) { + pr_warn("vmg %px state: (NULL)\n", vmg); + return; + } + + pr_warn("vmg %px state: mm %px pgoff %lx\n" + "vmi %px [%lx,%lx)\n" + "prev %px middle %px next %px target %px\n" + "start %lx end %lx flags %lx\n" + "file %px anon_vma %px policy %px\n" + "uffd_ctx %px\n" + "anon_name %px\n" + "state %x\n" + "just_expand %d\n" + "__adjust_middle_start %d __adjust_next_start %d\n" + "__remove_middle %d __remove_next %d\n", + vmg, vmg->mm, vmg->pgoff, + vmg->vmi, vmg->vmi ? vma_iter_addr(vmg->vmi) : 0, + vmg->vmi ? vma_iter_end(vmg->vmi) : 0, + vmg->prev, vmg->middle, vmg->next, vmg->target, + vmg->start, vmg->end, vmg->vm_flags, + vmg->file, vmg->anon_vma, vmg->policy, +#ifdef CONFIG_USERFAULTFD + vmg->uffd_ctx.ctx, +#else + (void *)0, +#endif + vmg->anon_name, + (int)vmg->state, + vmg->just_expand, + vmg->__adjust_middle_start, vmg->__adjust_next_start, + vmg->__remove_middle, vmg->__remove_next); + + if (vmg->mm) { + pr_warn("vmg %px mm:\n", vmg); + dump_mm(vmg->mm); + } else { + pr_warn("vmg %px mm: (NULL)\n", vmg); + } + + if (vmg->prev) { + pr_warn("vmg %px prev:\n", vmg); + dump_vma(vmg->prev); + } else { + pr_warn("vmg %px prev: (NULL)\n", vmg); + } + + if (vmg->middle) { + pr_warn("vmg %px middle:\n", vmg); + dump_vma(vmg->middle); + } else { + pr_warn("vmg %px middle: (NULL)\n", vmg); + } + + if (vmg->next) { + pr_warn("vmg %px next:\n", vmg); + dump_vma(vmg->next); + } else { + pr_warn("vmg %px next: (NULL)\n", vmg); + } + +#ifdef CONFIG_DEBUG_VM_MAPLE_TREE + if (vmg->vmi) { + pr_warn("vmg %px vmi:\n", vmg); + vma_iter_dump_tree(vmg->vmi); + } else { + pr_warn("vmg %px vmi: (NULL)\n", vmg); + } +#endif +} +EXPORT_SYMBOL(dump_vmg); + static bool page_init_poisoning __read_mostly = true; static int __init setup_vm_debug(char *str) @@ -265,7 +327,7 @@ static int __init setup_vm_debug(char *str) while (*str) { switch (tolower(*str)) { - case'p': + case 'p': __page_init_poisoning = true; break; default: |