diff --git a/Documentation/admin-guide/mm/ksm.rst b/Documentation/admin-guide/mm/ksm.rst
index b244f0202a03..8cabc2504005 100644
--- a/Documentation/admin-guide/mm/ksm.rst
+++ b/Documentation/admin-guide/mm/ksm.rst
@@ -32,7 +32,7 @@ are swapped back in: ksmd must rediscover their identity and merge again).
 Controlling KSM with madvise
 ============================
 
-KSM only operates on those areas of address space which an application
+KSM can operates on those areas of address space which an application
 has advised to be likely candidates for merging, by using the madvise(2)
 system call::
 
@@ -70,6 +70,23 @@ Applications should be considerate in their use of MADV_MERGEABLE,
 restricting its use to areas likely to benefit.  KSM's scans may use a lot
 of processing power: some installations will disable KSM for that reason.
 
+Controlling KSM with procfs
+===========================
+
+KSM can also operate on anonymous areas of address space of those processes's
+knob ``/proc/<pid>/ksm_force`` is on, even if app codes doesn't call madvise()
+explicitly to advise specific areas as MADV_MERGEABLE.
+
+You can set ksm_force to 1 to force all anonymous and qualified VMAs of
+this process to be involved in KSM scanning.
+	e.g. ``echo 1 > /proc/<pid>/ksm_force``
+
+You can also set ksm_force to 0 to cancel that force feature of this process
+and unmerge those merged pages which belongs to those VMAs not marked as
+MADV_MERGEABLE of this process. But that still leave those pages belonging to
+VMAs marked as MADV_MERGEABLE merged (fallback to the default state).
+	e.g. ``echo 0 > /proc/<pid>/ksm_force``
+
 .. _ksm_sysfs:
 
 KSM daemon sysfs interface
diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 061744c436d9..8890b8b457a4 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -47,6 +47,7 @@ fixes/update part 1.1  Stefani Seibold <stefani@seibold.net>    June 9 2009
   3.10  /proc/<pid>/timerslack_ns - Task timerslack value
   3.11	/proc/<pid>/patch_state - Livepatch patch operation state
   3.12	/proc/<pid>/arch_status - Task architecture specific information
+  3.13	/proc/<pid>/ksm_force - Setting of mandatory involvement in KSM
 
   4	Configuring procfs
   4.1	Mount options
@@ -2176,6 +2177,22 @@ AVX512_elapsed_ms
   the task is unlikely an AVX512 user, but depends on the workload and the
   scheduling scenario, it also could be a false negative mentioned above.
 
+3.13	/proc/<pid>/ksm_force - Setting of mandatory involvement in KSM
+-----------------------------------------------------------------------
+When CONFIG_KSM is enabled, this file can be used to specify if this
+process's anonymous memory can be involved in KSM scanning without app codes
+explicitly calling madvise to mark memory address as MADV_MERGEABLE.
+
+If writing 1 to this file, the kernel will force all anonymous and qualified
+memory to be involved in KSM scanning without explicitly calling madvise to
+mark memory address as MADV_MERGEABLE. But that is effective only when the
+klob of '/sys/kernel/mm/ksm/run' is set as 1.
+
+If writing 0 to this file, the mandatory KSM feature of this process's will
+be cancelled and unmerge those merged pages which belongs to those areas not
+marked as MADV_MERGEABLE of this process, but leave those pages belonging to
+areas marked as MADV_MERGEABLE merged (fallback to the default state).
+
 Chapter 4: Configuring procfs
 =============================
 
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 8dfa36a99c74..99ab0e8cdcbc 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -96,6 +96,7 @@
 #include <linux/time_namespace.h>
 #include <linux/resctrl.h>
 #include <linux/cn_proc.h>
+#include <linux/ksm.h>
 #include <trace/events/oom.h>
 #include "internal.h"
 #include "fd.h"
@@ -3168,6 +3169,100 @@ static int proc_pid_ksm_merging_pages(struct seq_file *m, struct pid_namespace *
 
 	return 0;
 }
+
+static ssize_t ksm_force_read(struct file *file, char __user *buf, size_t count,
+				loff_t *ppos)
+{
+	struct task_struct *task;
+	struct mm_struct *mm;
+	char buffer[PROC_NUMBUF];
+	ssize_t len;
+	int ret;
+
+	task = get_proc_task(file_inode(file));
+	if (!task)
+		return -ESRCH;
+
+	mm = get_task_mm(task);
+	ret = 0;
+	if (mm) {
+		len = snprintf(buffer, sizeof(buffer), "%d\n", mm->ksm_force);
+		ret =  simple_read_from_buffer(buf, count, ppos, buffer, len);
+		mmput(mm);
+	}
+
+	return ret;
+}
+
+static ssize_t ksm_force_write(struct file *file, const char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	struct task_struct *task;
+	struct mm_struct *mm;
+	char buffer[PROC_NUMBUF];
+	int force;
+	int err = 0;
+	int str_len;
+
+	if (count > sizeof(buffer) - 1) {
+		count = sizeof(buffer) - 1;
+	}
+
+	str_len = strncpy_from_user(buffer, buf, count);
+	if (str_len < 0)
+		return -EFAULT;
+	buffer[str_len] = '\0';
+
+	err = kstrtoint(strstrip(buffer), 0, &force);
+	if (err)
+		return err;
+
+	if (force != 0 && force != 1)
+		return -EINVAL;
+
+	task = get_proc_task(file_inode(file));
+	if (!task)
+		return -ESRCH;
+
+	mm = get_task_mm(task);
+	if (!mm)
+		goto out_put_task;
+
+	if (mm->ksm_force != force) {
+		if (mmap_write_lock_killable(mm)) {
+			err = -EINTR;
+			goto out_mmput;
+		}
+
+		if (force == 0)
+			mm->ksm_force = force;
+		else {
+			/*
+			 * Force anonymous pages of this mm to be involved in KSM merging
+			 * without explicitly calling madvise.
+			 */
+			if (!test_bit(MMF_VM_MERGEABLE, &mm->flags))
+				err = __ksm_enter(mm);
+			if (!err)
+				mm->ksm_force = force;
+		}
+
+		mmap_write_unlock(mm);
+	}
+
+out_mmput:
+	mmput(mm);
+out_put_task:
+	put_task_struct(task);
+
+	return err < 0 ? err : count;
+}
+
+static const struct file_operations proc_pid_ksm_force_operations = {
+	.read		= ksm_force_read,
+	.write		= ksm_force_write,
+	.llseek		= generic_file_llseek,
+};
 #endif /* CONFIG_KSM */
 
 #ifdef CONFIG_STACKLEAK_METRICS
@@ -3303,6 +3398,7 @@ static const struct pid_entry tgid_base_stuff[] = {
 #endif
 #ifdef CONFIG_KSM
 	ONE("ksm_merging_pages",  S_IRUSR, proc_pid_ksm_merging_pages),
+	REG("ksm_force", S_IRUSR|S_IWUSR, proc_pid_ksm_force_operations),
 #endif
 };
 
@@ -3639,6 +3735,7 @@ static const struct pid_entry tid_base_stuff[] = {
 #endif
 #ifdef CONFIG_KSM
 	ONE("ksm_merging_pages",  S_IRUSR, proc_pid_ksm_merging_pages),
+	REG("ksm_force", S_IRUSR|S_IWUSR, proc_pid_ksm_force_operations),
 #endif
 };
 
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index b34ff2cdbc4f..1b1592c2f5cf 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -661,6 +661,15 @@ struct mm_struct {
 		 * merging.
 		 */
 		unsigned long ksm_merging_pages;
+		/*
+		 * If true, force anonymous pages of this mm to be involved in KSM
+		 * merging without explicitly calling madvise. It is effctive only
+		 * when the klob of '/sys/kernel/mm/ksm/run' is set as 1. If false,
+		 * cancel the feature of ksm_force of this process and unmerge
+		 * those merged pages which is not madvised as MERGEABLE of this
+		 * process, but leave MERGEABLE areas merged.
+		 */
+		bool ksm_force;
 #endif
 	} __randomize_layout;
 
diff --git a/mm/ksm.c b/mm/ksm.c
index 38360285497a..c9f672dcc72e 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -334,6 +334,34 @@ static void __init ksm_slab_free(void)
 	mm_slot_cache = NULL;
 }
 
+/* Check if vma is qualified for ksmd scanning */
+static bool ksm_vma_check(struct vm_area_struct *vma)
+{
+	unsigned long vm_flags = vma->vm_flags;
+
+	if (!(vma->vm_flags & VM_MERGEABLE) && !(vma->vm_mm->ksm_force))
+		return false;
+
+	if (vm_flags & (VM_SHARED	| VM_MAYSHARE	|
+			VM_PFNMAP	| VM_IO | VM_DONTEXPAND |
+			VM_HUGETLB	| VM_MIXEDMAP))
+		return false;       /* just ignore this vma*/
+
+	if (vma_is_dax(vma))
+		return false;
+
+#ifdef VM_SAO
+	if (vm_flags & VM_SAO)
+		return false;
+#endif
+#ifdef VM_SPARC_ADI
+	if (vm_flags & VM_SPARC_ADI)
+		return false;
+#endif
+
+	return true;
+}
+
 static __always_inline bool is_stable_node_chain(struct stable_node *chain)
 {
 	return chain->rmap_hlist_len == STABLE_NODE_CHAIN;
@@ -523,7 +551,7 @@ static struct vm_area_struct *find_mergeable_vma(struct mm_struct *mm,
 	if (ksm_test_exit(mm))
 		return NULL;
 	vma = vma_lookup(mm, addr);
-	if (!vma || !(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
+	if (!vma || !ksm_vma_check(vma) || !vma->anon_vma)
 		return NULL;
 	return vma;
 }
@@ -2297,7 +2325,7 @@ static struct rmap_item *scan_get_next_rmap_item(struct page **page)
 		vma = find_vma(mm, ksm_scan.address);
 
 	for (; vma; vma = vma->vm_next) {
-		if (!(vma->vm_flags & VM_MERGEABLE))
+		if (!ksm_vma_check(vma))
 			continue;
 		if (ksm_scan.address < vma->vm_start)
 			ksm_scan.address = vma->vm_start;
