@@ -3301,6 +3301,21 @@ static ssize_t zero_pages_sharing_show(struct kobject *kobj,
}
KSM_ATTR_RO(zero_pages_sharing);
+static ssize_t general_profit_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ long general_profit;
+ long all_rmap_items;
+
+ all_rmap_items = ksm_max_page_sharing + ksm_pages_shared +
+ ksm_pages_unshared + pages_volatile();
+ general_profit = ksm_pages_sharing * PAGE_SIZE -
+ all_rmap_items * sizeof(struct ksm_rmap_item);
+
+ return sysfs_emit(buf, "%ld\n", general_profit);
+}
+KSM_ATTR_RO(general_profit);
+
static ssize_t stable_node_dups_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
@@ -3366,6 +3381,7 @@ static struct attribute *ksm_attrs[] = {
&stable_node_dups_attr.attr,
&stable_node_chains_prune_millisecs_attr.attr,
&use_zero_pages_attr.attr,
+ &general_profit_attr.attr,
NULL,
};
The documentation mentions a general profit metric, however this metric is not calculated. In addition the formula depends on the size of internal structures, which makes it more difficult for an administrator to make the calculation. Adding the metric for a better user experience. Signed-off-by: Stefan Roesch <shr@devkernel.io> --- mm/ksm.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)