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mm: move debug code out of page_alloc.c
dump_page() and dump_vma() are not specific to page_alloc.c, move them out so page_alloc.c won't turn into the unofficial debug repository. Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| #include <linux/kernel.h> | ||
| #include <linux/mm.h> | ||
| #include <linux/ftrace_event.h> | ||
| #include <linux/memcontrol.h> | ||
|
|
||
| static const struct trace_print_flags pageflag_names[] = { | ||
| {1UL << PG_locked, "locked" }, | ||
| {1UL << PG_error, "error" }, | ||
| {1UL << PG_referenced, "referenced" }, | ||
| {1UL << PG_uptodate, "uptodate" }, | ||
| {1UL << PG_dirty, "dirty" }, | ||
| {1UL << PG_lru, "lru" }, | ||
| {1UL << PG_active, "active" }, | ||
| {1UL << PG_slab, "slab" }, | ||
| {1UL << PG_owner_priv_1, "owner_priv_1" }, | ||
| {1UL << PG_arch_1, "arch_1" }, | ||
| {1UL << PG_reserved, "reserved" }, | ||
| {1UL << PG_private, "private" }, | ||
| {1UL << PG_private_2, "private_2" }, | ||
| {1UL << PG_writeback, "writeback" }, | ||
| #ifdef CONFIG_PAGEFLAGS_EXTENDED | ||
| {1UL << PG_head, "head" }, | ||
| {1UL << PG_tail, "tail" }, | ||
| #else | ||
| {1UL << PG_compound, "compound" }, | ||
| #endif | ||
| {1UL << PG_swapcache, "swapcache" }, | ||
| {1UL << PG_mappedtodisk, "mappedtodisk" }, | ||
| {1UL << PG_reclaim, "reclaim" }, | ||
| {1UL << PG_swapbacked, "swapbacked" }, | ||
| {1UL << PG_unevictable, "unevictable" }, | ||
| #ifdef CONFIG_MMU | ||
| {1UL << PG_mlocked, "mlocked" }, | ||
| #endif | ||
| #ifdef CONFIG_ARCH_USES_PG_UNCACHED | ||
| {1UL << PG_uncached, "uncached" }, | ||
| #endif | ||
| #ifdef CONFIG_MEMORY_FAILURE | ||
| {1UL << PG_hwpoison, "hwpoison" }, | ||
| #endif | ||
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE | ||
| {1UL << PG_compound_lock, "compound_lock" }, | ||
| #endif | ||
| }; | ||
|
|
||
| static void dump_flags(unsigned long flags, | ||
| const struct trace_print_flags *names, int count) | ||
| { | ||
| const char *delim = ""; | ||
| unsigned long mask; | ||
| int i; | ||
|
|
||
| printk(KERN_ALERT "flags: %#lx(", flags); | ||
|
|
||
| /* remove zone id */ | ||
| flags &= (1UL << NR_PAGEFLAGS) - 1; | ||
|
|
||
| for (i = 0; i < count && flags; i++) { | ||
|
|
||
| mask = names[i].mask; | ||
| if ((flags & mask) != mask) | ||
| continue; | ||
|
|
||
| flags &= ~mask; | ||
| printk("%s%s", delim, names[i].name); | ||
| delim = "|"; | ||
| } | ||
|
|
||
| /* check for left over flags */ | ||
| if (flags) | ||
| printk("%s%#lx", delim, flags); | ||
|
|
||
| printk(")\n"); | ||
| } | ||
|
|
||
| void dump_page_badflags(struct page *page, const char *reason, | ||
| unsigned long badflags) | ||
| { | ||
| printk(KERN_ALERT | ||
| "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n", | ||
| page, atomic_read(&page->_count), page_mapcount(page), | ||
| page->mapping, page->index); | ||
| BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS); | ||
| dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names)); | ||
| if (reason) | ||
| pr_alert("page dumped because: %s\n", reason); | ||
| if (page->flags & badflags) { | ||
| pr_alert("bad because of flags:\n"); | ||
| dump_flags(page->flags & badflags, | ||
| pageflag_names, ARRAY_SIZE(pageflag_names)); | ||
| } | ||
| mem_cgroup_print_bad_page(page); | ||
| } | ||
|
|
||
| void dump_page(struct page *page, const char *reason) | ||
| { | ||
| dump_page_badflags(page, reason, 0); | ||
| } | ||
| EXPORT_SYMBOL(dump_page); | ||
|
|
||
| #ifdef CONFIG_DEBUG_VM | ||
|
|
||
| static const struct trace_print_flags vmaflags_names[] = { | ||
| {VM_READ, "read" }, | ||
| {VM_WRITE, "write" }, | ||
| {VM_EXEC, "exec" }, | ||
| {VM_SHARED, "shared" }, | ||
| {VM_MAYREAD, "mayread" }, | ||
| {VM_MAYWRITE, "maywrite" }, | ||
| {VM_MAYEXEC, "mayexec" }, | ||
| {VM_MAYSHARE, "mayshare" }, | ||
| {VM_GROWSDOWN, "growsdown" }, | ||
| {VM_PFNMAP, "pfnmap" }, | ||
| {VM_DENYWRITE, "denywrite" }, | ||
| {VM_LOCKED, "locked" }, | ||
| {VM_IO, "io" }, | ||
| {VM_SEQ_READ, "seqread" }, | ||
| {VM_RAND_READ, "randread" }, | ||
| {VM_DONTCOPY, "dontcopy" }, | ||
| {VM_DONTEXPAND, "dontexpand" }, | ||
| {VM_ACCOUNT, "account" }, | ||
| {VM_NORESERVE, "noreserve" }, | ||
| {VM_HUGETLB, "hugetlb" }, | ||
| {VM_NONLINEAR, "nonlinear" }, | ||
| #if defined(CONFIG_X86) | ||
| {VM_PAT, "pat" }, | ||
| #elif defined(CONFIG_PPC) | ||
| {VM_SAO, "sao" }, | ||
| #elif defined(CONFIG_PARISC) || defined(CONFIG_METAG) || defined(CONFIG_IA64) | ||
| {VM_GROWSUP, "growsup" }, | ||
| #elif !defined(CONFIG_MMU) | ||
| {VM_MAPPED_COPY, "mappedcopy" }, | ||
| #else | ||
| {VM_ARCH_1, "arch_1" }, | ||
| #endif | ||
| {VM_DONTDUMP, "dontdump" }, | ||
| #ifdef CONFIG_MEM_SOFT_DIRTY | ||
| {VM_SOFTDIRTY, "softdirty" }, | ||
| #endif | ||
| {VM_MIXEDMAP, "mixedmap" }, | ||
| {VM_HUGEPAGE, "hugepage" }, | ||
| {VM_NOHUGEPAGE, "nohugepage" }, | ||
| {VM_MERGEABLE, "mergeable" }, | ||
| }; | ||
|
|
||
| void dump_vma(const struct vm_area_struct *vma) | ||
| { | ||
| printk(KERN_ALERT | ||
| "vma %p start %p end %p\n" | ||
| "next %p prev %p mm %p\n" | ||
| "prot %lx anon_vma %p vm_ops %p\n" | ||
| "pgoff %lx file %p private_data %p\n", | ||
| vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next, | ||
| vma->vm_prev, 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); | ||
| dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names)); | ||
| } | ||
| EXPORT_SYMBOL(dump_vma); | ||
|
|
||
| #endif /* CONFIG_DEBUG_VM */ |
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