Very similar to VM_BUG_ON_PAGE and VM_BUG_ON_VMA, dump struct_mm
when the bug is hit.
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
include/linux/mmdebug.h | 10 +++++++
mm/debug.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 79 insertions(+)
diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index 569e4c8..5116d4b 100644
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -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)
diff --git a/mm/debug.c b/mm/debug.c
index c19af12..8418893 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -1,3 +1,10 @@
+/*
+ * mm/debug.c
+ *
+ * mm/ specific debug routines.
+ *
+ */
+
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/ftrace_event.h>
@@ -158,4 +165,66 @@ 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
+ "owner %p 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
+ 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
+ mm->owner, 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
+ );
+
+ dump_flags(mm->def_flags, vmaflags_names,
+ ARRAY_SIZE(vmaflags_names));
+}
+
#endif /* CONFIG_DEBUG_VM */
--
1.7.10.4
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