linux-kernel - [PATCH RESEND 4/6] memcontrol-v1: add ksm_zero_pages in cgroup/memory.ksm

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Message-Id: <20250422112149.3231488-1-xu.xin16@zte.com.cn>
Date: Tue, 22 Apr 2025 11:21:49 +0000
From: xu xin <xu.xin.sc@...il.com>
To: xu.xin16@....com.cn
Cc: akpm@...ux-foundation.org,
	david@...hat.com,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	wang.yaxin@....com.cn,
	yang.yang29@....com.cn
Subject: [PATCH RESEND 4/6] memcontrol-v1: add ksm_zero_pages in cgroup/memory.ksm_stat

Users can obtain ksm_zero_pages of a cgroup just by:

/ # cat /sys/fs/cgroup/memory.ksm_stat
ksm_rmap_items 76800
ksm_zero_pages 0

Current implementation supports cgroup v1 temporarily; cgroup v2
compatibility is planned for future versions.

Signed-off-by: xu xin <xu.xin16@....com.cn>
---
 mm/memcontrol-v1.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c
index fa57a5deb28c..9680749f4eef 100644
--- a/mm/memcontrol-v1.c
+++ b/mm/memcontrol-v1.c
@@ -11,6 +11,7 @@
 #include <linux/sort.h>
 #include <linux/file.h>
 #include <linux/seq_buf.h>
+#include <linux/ksm.h>
 
 #include "internal.h"
 #include "swap.h"
@@ -1824,6 +1825,7 @@ static int memcg_numa_stat_show(struct seq_file *m, void *v)
 #ifdef CONFIG_KSM
 struct memcg_ksm_stat {
 	unsigned long ksm_rmap_items;
+	long ksm_zero_pages;
 };
 
 static int evaluate_memcg_ksm_stat(struct task_struct *task, void *arg)
@@ -1834,6 +1836,7 @@ static int evaluate_memcg_ksm_stat(struct task_struct *task, void *arg)
 	mm = get_task_mm(task);
 	if (mm) {
 		ksm_stat->ksm_rmap_items += mm->ksm_rmap_items;
+		ksm_stat->ksm_zero_pages += mm_ksm_zero_pages(mm);
 		mmput(mm);
 	}
 
@@ -1847,9 +1850,13 @@ static int memcg_ksm_stat_show(struct seq_file *m, void *v)
 
 	/* Initialization */
 	ksm_stat.ksm_rmap_items = 0;
+	ksm_stat.ksm_zero_pages = 0;
+
 	/* summing all processes'ksm statistic items of this cgroup hierarchy */
 	mem_cgroup_scan_tasks(memcg, evaluate_memcg_ksm_stat, &ksm_stat);
+
 	seq_printf(m, "ksm_rmap_items %lu\n", ksm_stat.ksm_rmap_items);
+	seq_printf(m, "ksm_zero_pages %ld\n", ksm_stat.ksm_zero_pages);
 
 	return 0;
 }
-- 
2.39.3