linux-kernel - [RFC PATCH 3/3] mm/memory-tiers: Show toptier memory usage for cgroup

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Date:   Tue, 14 Jun 2022 15:25:35 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     linux-mm@...ck.org, akpm@...ux-foundation.org
Cc:     Tim Chen <tim.c.chen@...ux.intel.com>, Wei Xu <weixugc@...gle.com>,
        Huang Ying <ying.huang@...el.com>,
        Greg Thelen <gthelen@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Brice Goglin <brice.goglin@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hesham Almatary <hesham.almatary@...wei.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alistair Popple <apopple@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Feng Tang <feng.tang@...el.com>,
        Jagdish Gediya <jvgediya@...ux.ibm.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        David Rientjes <rientjes@...gle.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Shakeel Butt <shakeelb@...gle.com>
Subject: [RFC PATCH 3/3] mm/memory-tiers: Show toptier memory usage for cgroup

Show toptier memory usage for a cgroup via sysfs:

/sys/fs/cgroup/<group>/memory.toptier
---
 mm/memcontrol.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2f20ec2712b8..5fd1e3b686cd 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6205,6 +6205,14 @@ static u64 memory_current_read(struct cgroup_subsys_state *css,
 	return (u64)page_counter_read(&memcg->memory) * PAGE_SIZE;
 }
 
+static u64 memory_toptier_read(struct cgroup_subsys_state *css,
+			       struct cftype *cft)
+{
+	struct mem_cgroup *memcg = mem_cgroup_from_css(css);
+
+	return (u64)mem_cgroup_toptier_usage(memcg) * PAGE_SIZE;
+}
+
 static u64 memory_peak_read(struct cgroup_subsys_state *css,
 			    struct cftype *cft)
 {
@@ -6516,6 +6524,11 @@ static struct cftype memory_files[] = {
 		.flags = CFTYPE_NOT_ON_ROOT,
 		.read_u64 = memory_current_read,
 	},
+	{
+		.name = "toptier",
+		.flags = CFTYPE_NOT_ON_ROOT,
+		.read_u64 = memory_toptier_read,
+	},
 	{
 		.name = "peak",
 		.flags = CFTYPE_NOT_ON_ROOT,
-- 
2.35.1