[PATCH v2 5/7] hugetlb: add charge_surplus_hugepages attribute

TSUKADA Koutaro
2018-05-18T04:37:37Z

Add an entry for charge_surplus_hugepages to sysfs.

Signed-off-by: TSUKADA Koutaro <tsukada@ascade.co.jp>
---
hugetlb.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 9a9549c..2f9bdbc 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2662,6 +2662,30 @@ static ssize_t surplus_hugepages_show(struct kobject *kobj,
}
HSTATE_ATTR_RO(surplus_hugepages);

+static ssize_t charge_surplus_hugepages_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct hstate *h = kobj_to_hstate(kobj, NULL);
+ return sprintf(buf, "%d\n", h->charge_surplus_huge_pages);
+}
+
+static ssize_t charge_surplus_hugepages_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t len)
+{
+ int err;
+ unsigned long input;
+ struct hstate *h = kobj_to_hstate(kobj, NULL);
+
+ err = kstrtoul(buf, 10, &input);
+ if (err)
+ return err;
+
+ h->charge_surplus_huge_pages = input ? true : false;
+
+ return len;
+}
+HSTATE_ATTR(charge_surplus_hugepages);
+
static struct attribute *hstate_attrs[] = {
&nr_hugepages_attr.attr,
&nr_overcommit_hugepages_attr.attr,
@@ -2671,6 +2695,7 @@ static ssize_t surplus_hugepages_show(struct kobject *kobj,
#ifdef CONFIG_NUMA
&nr_hugepages_mempolicy_attr.attr,
#endif
+ &charge_surplus_hugepages_attr.attr,
NULL,
};

--
Tsukada