This adds the ksm_merge_type function. The function returns the merge
type for the process. For madvise it returns "madvise", for prctl it
returns "process" and otherwise it returns "none".
Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx>
---
include/linux/ksm.h | 1 +
mm/ksm.c | 11 +++++++++++
2 files changed, 12 insertions(+)
diff --git a/include/linux/ksm.h b/include/linux/ksm.h
index a18cd03efcfb..d5f69f18ee5a 100644
--- a/include/linux/ksm.h
+++ b/include/linux/ksm.h
@@ -57,6 +57,7 @@ void folio_migrate_ksm(struct folio *newfolio, struct folio *folio);
#ifdef CONFIG_PROC_FS
long ksm_process_profit(struct mm_struct *);
+const char *ksm_merge_type(struct mm_struct *mm);
#endif /* CONFIG_PROC_FS */
#else /* !CONFIG_KSM */
diff --git a/mm/ksm.c b/mm/ksm.c
index b3db29605303..3121bc0f48f3 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -3030,6 +3030,17 @@ long ksm_process_profit(struct mm_struct *mm)
return (long)mm->ksm_merging_pages * PAGE_SIZE -
mm->ksm_rmap_items * sizeof(struct ksm_rmap_item);
}
+
+/* Return merge type name as string. */
+const char *ksm_merge_type(struct mm_struct *mm)
+{
+ if (test_bit(MMF_VM_MERGE_ANY, &mm->flags))
+ return "process";
+ else if (test_bit(MMF_VM_MERGEABLE, &mm->flags))
+ return "madvise";
+ else
+ return "none";
+}
#endif /* CONFIG_PROC_FS */
#ifdef CONFIG_SYSFS
--
2.30.2
