linux-kernel - [PATCH v2 5/7] hugetlb: add charge_surplus

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Date:   Fri, 18 May 2018 13:37:37 +0900
From:   TSUKADA Koutaro <tsukada@...ade.co.jp>
To:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Jonathan Corbet <corbet@....net>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>,
        David Rientjes <rientjes@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        Marc-Andre Lureau <marcandre.lureau@...hat.com>,
        Punit Agrawal <punit.agrawal@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, cgroups@...r.kernel.org, tsukada@...ade.co.jp
Subject: [PATCH v2 5/7] hugetlb: add charge_surplus_hugepages attribute

Add an entry for charge_surplus_hugepages to sysfs.

Signed-off-by: TSUKADA Koutaro <tsukada@...ade.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