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

Commit Message

TSUKADA Koutaro May 18, 2018, 4:37 a.m. UTC

Add an entry for charge_surplus_hugepages to sysfs.

Signed-off-by: TSUKADA Koutaro <[e-mail]>
---
 hugetlb.c |   25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

Patch

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,
 };