diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 6a882c57a7e7..4e06f246407c 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -48,6 +48,7 @@ fixes/update part 1.1  Stefani Seibold <stefani@seibold.net>    June 9 2009
   3.11	/proc/<pid>/patch_state - Livepatch patch operation state
   3.12	/proc/<pid>/arch_status - Task architecture specific information
   3.13  /proc/<pid>/fd - List of symlinks to open files
+  3.14  /proc/<pid/ksm_stat - Information about the process' ksm status.
 
   4	Configuring procfs
   4.1	Mount options
@@ -2232,6 +2233,73 @@ The number of open files for the process is stored in 'size' member
 of stat() output for /proc/<pid>/fd for fast access.
 -------------------------------------------------------
 
+3.14 /proc/<pid/ksm_stat - Information about the process' ksm status
+--------------------------------------------------------------------
+When CONFIG_KSM is enabled, each process has this file which displays
+the information of ksm merging status.
+
+Example
+~~~~~~~
+
+::
+
+    / # cat /proc/self/ksm_stat
+    ksm_rmap_items 0
+    ksm_zero_pages 0
+    ksm_merging_pages 0
+    ksm_process_profit 0
+    ksm_merge_any: no
+    ksm_mergeable: no
+
+Description
+~~~~~~~~~~~
+
+ksm_rmap_items
+^^^^^^^^^^^^^^
+
+The number of ksm_rmap_item structures in use.  The structure
+ksm_rmap_item stores the reverse mapping information for virtual
+addresses.  KSM will generate a ksm_rmap_item for each ksm-scanned page of
+the process.
+
+ksm_zero_pages
+^^^^^^^^^^^^^^
+
+When /sys/kernel/mm/ksm/use_zero_pages is enabled, it represent how many
+empty pages are merged with kernel zero pages by KSM.
+
+ksm_merging_pages
+^^^^^^^^^^^^^^^^^
+
+It represents how many pages of this process are involved in KSM merging
+(not including ksm_zero_pages). It is the same with what
+/proc/<pid>/ksm_merging_pages shows.
+
+ksm_process_profit
+^^^^^^^^^^^^^^^^^^
+
+The profit that KSM brings (Saved bytes). KSM can save memory by merging
+identical pages, but also can consume additional memory, because it needs
+to generate a number of rmap_items to save each scanned page's brief rmap
+information. Some of these pages may be merged, but some may not be abled
+to be merged after being checked several times, which are unprofitable
+memory consumed.
+
+ksm_merge_any
+^^^^^^^^^^^^^
+
+It specifies whether the process'mm is added by prctl() into the candidate list
+of KSM or not, and if KSM scanning is fully enabled at process level.
+
+ksm_mergeable
+^^^^^^^^^^^^^
+
+It specifies whether any VMAs of the process'mm are currently applicable
+to KSM.
+
+More information about KSM can be found in
+Documentation/admin-guide/mm/ksm.rst.
+
 
 Chapter 4: Configuring procfs
 =============================
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 0edf14a9840e..a50b222a5917 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3269,6 +3269,7 @@ static int proc_pid_ksm_stat(struct seq_file *m, struct pid_namespace *ns,
 				struct pid *pid, struct task_struct *task)
 {
 	struct mm_struct *mm;
+	int ret = 0;
 
 	mm = get_task_mm(task);
 	if (mm) {
@@ -3276,6 +3277,16 @@ static int proc_pid_ksm_stat(struct seq_file *m, struct pid_namespace *ns,
 		seq_printf(m, "ksm_zero_pages %ld\n", mm_ksm_zero_pages(mm));
 		seq_printf(m, "ksm_merging_pages %lu\n", mm->ksm_merging_pages);
 		seq_printf(m, "ksm_process_profit %ld\n", ksm_process_profit(mm));
+		seq_printf(m, "ksm_merge_any: %s\n",
+				test_bit(MMF_VM_MERGE_ANY, &mm->flags) ? "yes" : "no");
+		ret = mmap_read_lock_killable(mm);
+		if (ret) {
+			mmput(mm);
+			return ret;
+		}
+		seq_printf(m, "ksm_mergeable: %s\n",
+				ksm_process_mergeable(mm) ? "yes" : "no");
+		mmap_read_unlock(mm);
 		mmput(mm);
 	}
 
diff --git a/include/linux/ksm.h b/include/linux/ksm.h
index 6a53ac4885bb..d73095b5cd96 100644
--- a/include/linux/ksm.h
+++ b/include/linux/ksm.h
@@ -93,6 +93,7 @@ void folio_migrate_ksm(struct folio *newfolio, struct folio *folio);
 void collect_procs_ksm(const struct folio *folio, const struct page *page,
 		struct list_head *to_kill, int force_early);
 long ksm_process_profit(struct mm_struct *);
+bool ksm_process_mergeable(struct mm_struct *mm);
 
 #else  /* !CONFIG_KSM */
 
diff --git a/mm/ksm.c b/mm/ksm.c
index 31a9bc365437..8be2b144fefd 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -3262,6 +3262,25 @@ static void wait_while_offlining(void)
 #endif /* CONFIG_MEMORY_HOTREMOVE */
 
 #ifdef CONFIG_PROC_FS
+/*
+ * The process is mergeable only if any VMA is currently
+ * applicable to KSM.
+ *
+ * The mmap lock must be held in read mode.
+ */
+bool ksm_process_mergeable(struct mm_struct *mm)
+{
+	struct vm_area_struct *vma;
+
+	mmap_assert_locked(mm);
+	VMA_ITERATOR(vmi, mm, 0);
+	for_each_vma(vmi, vma)
+		if (vma->vm_flags & VM_MERGEABLE)
+			return true;
+
+	return false;
+}
+
 long ksm_process_profit(struct mm_struct *mm)
 {
 	return (long)(mm->ksm_merging_pages + mm_ksm_zero_pages(mm)) * PAGE_SIZE -