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Commit 82742a3a authored by Sasha Levin's avatar Sasha Levin Committed by Linus Torvalds
Browse files

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: default avatarSasha Levin <sasha.levin@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 81d0fa62

mm/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -18,7 +18,7 @@ obj-y := filemap.o mempool.o oom_kill.o \ 
			   mm_init.o mmu_context.o percpu.o slab_common.o \

			   compaction.o balloon_compaction.o vmacache.o \

			   interval_tree.o list_lru.o workingset.o \

			   iov_iter.o $(mmu-y)

			   iov_iter.o debug.o $(mmu-y)



obj-y += init-mm.o

mm/debug.c

0 → 100644
+162 −0
Original line number Diff line number Diff line 
#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 */

mm/page_alloc.c

+0 −160
Original line number Diff line number Diff line
@@ -53,8 +53,6 @@ 
#include <linux/kmemleak.h>

#include <linux/compaction.h>

#include <trace/events/kmem.h>

#include <linux/ftrace_event.h>

#include <linux/memcontrol.h>

#include <linux/prefetch.h>

#include <linux/mm_inline.h>

#include <linux/migrate.h>
@@ -6550,161 +6548,3 @@ bool is_free_buddy_page(struct page *page) 
	return order < MAX_ORDER;

}

#endif
 


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 */