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Commit 0bf55139 authored by Sasha Levin's avatar Sasha Levin Committed by Linus Torvalds
Browse files

mm: introduce dump_vma 



Introduce a helper to dump information about a VMA, this also makes
dump_page_flags more generic and re-uses that so the output looks very
similar to dump_page:

[   61.903437] vma ffff88070f88be00 start 00007fff25970000 end 00007fff25992000
[   61.903437] next ffff88070facd600 prev ffff88070face400 mm ffff88070fade000
[   61.903437] prot 8000000000000025 anon_vma ffff88070fa1e200 vm_ops           (null)
[   61.903437] pgoff 7ffffffdd file           (null) private_data           (null)
[   61.909129] flags: 0x100173(read|write|mayread|maywrite|mayexec|growsdown|account)

[akpm@linux-foundation.org: make dump_vma() require CONFIG_DEBUG_VM]
[swarren@nvidia.com: fix dump_vma() compilation]
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
Reviewed-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Michel Lespinasse <walken@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b208ce32

include/linux/mmdebug.h

+2 −0
Original line number Diff line number Diff line
@@ -4,10 +4,12 @@ 
#include <linux/stringify.h>



struct page;

struct vm_area_struct;



extern void dump_page(struct page *page, const char *reason);

extern void dump_page_badflags(struct page *page, const char *reason,

			       unsigned long badflags);

void dump_vma(const struct vm_area_struct *vma);



#ifdef CONFIG_DEBUG_VM

#define VM_BUG_ON(cond) BUG_ON(cond)

mm/page_alloc.c

+73 −9
Original line number Diff line number Diff line
@@ -6626,27 +6626,26 @@ static const struct trace_print_flags pageflag_names[] = { 
#endif

};



static void dump_page_flags(unsigned long flags)

static void dump_flags(unsigned long flags,

			const struct trace_print_flags *names, int count)

{

	const char *delim = "";

	unsigned long mask;

	int i;



	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);



	printk(KERN_ALERT "page flags: %#lx(", flags);

	printk(KERN_ALERT "flags: %#lx(", flags);



	/* remove zone id */

	flags &= (1UL << NR_PAGEFLAGS) - 1;



	for (i = 0; i < ARRAY_SIZE(pageflag_names) && flags; i++) {

	for (i = 0; i < count && flags; i++) {



		mask = pageflag_names[i].mask;

		mask = names[i].mask;

		if ((flags & mask) != mask)

			continue;



		flags &= ~mask;

		printk("%s%s", delim, pageflag_names[i].name);

		printk("%s%s", delim, names[i].name);

		delim = "|";

	}
@@ -6664,12 +6663,14 @@ void dump_page_badflags(struct page *page, const char *reason, 
	       "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",

		page, atomic_read(&page->_count), page_mapcount(page),

		page->mapping, page->index);

	dump_page_flags(page->flags);

	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_page_flags(page->flags & badflags);

		dump_flags(page->flags & badflags,

				pageflag_names, ARRAY_SIZE(pageflag_names));

	}

	mem_cgroup_print_bad_page(page);

}
@@ -6679,3 +6680,66 @@ 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 */