Commit 31c9afa6 authored by Sasha Levin's avatar Sasha Levin Committed by Linus Torvalds
Browse files

mm: introduce VM_BUG_ON_MM 



Very similar to VM_BUG_ON_PAGE and VM_BUG_ON_VMA, dump struct_mm when the
bug is hit.

[akpm@linux-foundation.org: coding-style fixes]
[mhocko@suse.cz: fix build]
[mhocko@suse.cz: fix build some more]
[akpm@linux-foundation.org: do strange things to avoid doing strange things for the comma separators]
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 82742a3a

include/linux/mmdebug.h

+10 −0
Original line number Diff line number Diff line
@@ -5,11 +5,13 @@ 


struct page;

struct vm_area_struct;

struct mm_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);

void dump_mm(const struct mm_struct *mm);



#ifdef CONFIG_DEBUG_VM

#define VM_BUG_ON(cond) BUG_ON(cond)
@@ -27,6 +29,13 @@ void dump_vma(const struct vm_area_struct *vma); 
			BUG();						\

		}							\

	} while (0)

#define VM_BUG_ON_MM(cond, mm)						\

	do {								\

		if (unlikely(cond)) {					\

			dump_mm(mm);					\

			BUG();						\

		}							\

	} while (0)

#define VM_WARN_ON(cond) WARN_ON(cond)

#define VM_WARN_ON_ONCE(cond) WARN_ON_ONCE(cond)

#define VM_WARN_ONCE(cond, format...) WARN_ONCE(cond, format)
@@ -34,6 +43,7 @@ void dump_vma(const struct vm_area_struct *vma); 
#define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)

#define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)

#define VM_BUG_ON_VMA(cond, vma) VM_BUG_ON(cond)

#define VM_BUG_ON_MM(cond, mm) VM_BUG_ON(cond)

#define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)

#define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)

#define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)

mm/debug.c

+78 −0
Original line number Diff line number Diff line 
/*

 * mm/debug.c

 *

 * mm/ specific debug routines.

 *

 */



#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/ftrace_event.h>
@@ -159,4 +166,75 @@ void dump_vma(const struct vm_area_struct *vma) 
}

EXPORT_SYMBOL(dump_vma);



void dump_mm(const struct mm_struct *mm)

{

	printk(KERN_ALERT

		"mm %p mmap %p seqnum %d task_size %lu\n"

#ifdef CONFIG_MMU

		"get_unmapped_area %p\n"

#endif

		"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"

		"pgd %p mm_users %d mm_count %d nr_ptes %lu map_count %d\n"

		"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"

		"pinned_vm %lx shared_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 %p flags %lx core_state %p\n"

#ifdef CONFIG_AIO

		"ioctx_table %p\n"

#endif

#ifdef CONFIG_MEMCG

		"owner %p "

#endif

		"exe_file %p\n"

#ifdef CONFIG_MMU_NOTIFIER

		"mmu_notifier_mm %p\n"

#endif

#ifdef CONFIG_NUMA_BALANCING

		"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"

#endif

#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)

		"tlb_flush_pending %d\n"

#endif

		"%s",	/* This is here to hold the comma */



		mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,

#ifdef CONFIG_MMU

		mm->get_unmapped_area,

#endif

		mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,

		mm->pgd, atomic_read(&mm->mm_users),

		atomic_read(&mm->mm_count),

		atomic_long_read((atomic_long_t *)&mm->nr_ptes),

		mm->map_count,

		mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,

		mm->pinned_vm, mm->shared_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, mm->core_state,

#ifdef CONFIG_AIO

		mm->ioctx_table,

#endif

#ifdef CONFIG_MEMCG

		mm->owner,

#endif

		mm->exe_file,

#ifdef CONFIG_MMU_NOTIFIER

		mm->mmu_notifier_mm,

#endif

#ifdef CONFIG_NUMA_BALANCING

		mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,

#endif

#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)

		mm->tlb_flush_pending,

#endif

		""		/* This is here to not have a comma! */

		);



		dump_flags(mm->def_flags, vmaflags_names,

				ARRAY_SIZE(vmaflags_names));

}



#endif		/* CONFIG_DEBUG_VM */

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