On Thu, 20 Jun 2024 13:39:14 +0900 Sung-hun Kim <sfoon.kim@xxxxxxxxxxx> wrote: > The current version of KSM does not take into account the number of > used ksm_mm_slot. Therefore, when users want to obtain profits of > KSM, KSM omits the memory used for allocating ksm_mm_slots. > > This patch introduces a new variable to keep track of the number of > allocated ksm_mm_slots. By doing so, KSM will be able to provide a > more accurate number of the gains made. > By how much does the improve the accuracy? In other words, how much difference does this make? > @@ -3672,7 +3680,8 @@ static ssize_t general_profit_show(struct kobject *kobj, > long general_profit; > > general_profit = (ksm_pages_sharing + atomic_long_read(&ksm_zero_pages)) * PAGE_SIZE - > - ksm_rmap_items * sizeof(struct ksm_rmap_item); > + ksm_rmap_items * sizeof(struct ksm_rmap_item) - > + atomic_long_read(&ksm_mm_slots) * sizeof(struct ksm_mm_slot); > > return sysfs_emit(buf, "%ld\n", general_profit); This assumes perfect slab packing, no? Should it use ksize()?
