This patch adds line "HWPoinson: <size> kB" into /proc/pid/smaps if
CONFIG_MEMORY_FAILURE=y and some HWPoison pages were found.
This may be useful for searching applications which use a broken memory.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
---
fs/proc/task_mmu.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index b1d9729..3e564f0 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -394,6 +394,7 @@ struct mem_size_stats {
unsigned long anonymous_thp;
unsigned long swap;
unsigned long nonlinear;
+ unsigned long hwpoison;
u64 pss;
};
@@ -416,6 +417,8 @@ static void smaps_pte_entry(pte_t ptent, unsigned long addr,
mss->swap += ptent_size;
else if (is_migration_entry(swpent))
page = migration_entry_to_page(swpent);
+ else if (is_hwpoison_entry(swpent))
+ mss->hwpoison += ptent_size;
} else if (pte_file(ptent)) {
if (pte_to_pgoff(ptent) != pgoff)
mss->nonlinear += ptent_size;
@@ -430,6 +433,9 @@ static void smaps_pte_entry(pte_t ptent, unsigned long addr,
if (page->index != pgoff)
mss->nonlinear += ptent_size;
+ if (PageHWPoison(page))
+ mss->hwpoison += ptent_size;
+
mss->resident += ptent_size;
/* Accumulate the size in pages that have been accessed. */
if (pte_young(ptent) || PageReferenced(page))
@@ -535,6 +541,10 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
seq_printf(m, "Nonlinear: %8lu kB\n",
mss.nonlinear >> 10);
+ if (IS_ENABLED(CONFIG_MEMORY_FAILURE) && mss.hwpoison)
+ seq_printf(m, "HWPoison: %8lu kB\n",
+ mss.hwpoison >> 10);
+
if (m->count < m->size) /* vma is copied successfully */
m->version = (vma != get_gate_vma(task->mm))
? vma->vm_start : 0;
--
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