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@devkernel.io --- 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