The ksm documentation mentions the process profit metric and how to calculate it. This adds the calculation of the metric.
Signed-off-by: Stefan Roesch shr@devkernel.io --- include/linux/ksm.h | 4 ++++ mm/ksm.c | 8 ++++++++ 2 files changed, 12 insertions(+)
diff --git a/include/linux/ksm.h b/include/linux/ksm.h index d38a05a36298..a18cd03efcfb 100644 --- a/include/linux/ksm.h +++ b/include/linux/ksm.h @@ -55,6 +55,10 @@ struct page *ksm_might_need_to_copy(struct page *page, void rmap_walk_ksm(struct folio *folio, struct rmap_walk_control *rwc); void folio_migrate_ksm(struct folio *newfolio, struct folio *folio);
+#ifdef CONFIG_PROC_FS +long ksm_process_profit(struct mm_struct *); +#endif /* CONFIG_PROC_FS */ + #else /* !CONFIG_KSM */
static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) diff --git a/mm/ksm.c b/mm/ksm.c index a0b4611112c0..b3db29605303 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -3024,6 +3024,14 @@ static void wait_while_offlining(void) } #endif /* CONFIG_MEMORY_HOTREMOVE */
+#ifdef CONFIG_PROC_FS +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); +} +#endif /* CONFIG_PROC_FS */ + #ifdef CONFIG_SYSFS /* * This all compiles without CONFIG_SYSFS, but is a waste of space.