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@xxxxxxxxxx>
---
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
