mm/ksm: fix ksm_zero_pages accounting

We normally ksm_zero_pages++ in ksmd when page is merged with zero page,
but ksm_zero_pages-- is done from page tables side, where there is no any
accessing protection of ksm_zero_pages.

So we can read very exceptional value of ksm_zero_pages in rare cases,
such as -1, which is very confusing to users.

Fix it by changing to use atomic_long_t, and the same case with the
mm->ksm_zero_pages.

Link: https://lkml.kernel.org/r/20240528-b4-ksm-counters-v3-2-34bb358fdc13@linux.dev
Fixes: e2942062e01d ("ksm: count all zero pages placed by KSM")
Fixes: 6080d19f0704 ("ksm: add ksm zero pages for each process")
Signed-off-by: Chengming Zhou <chengming.zhou@linux.dev>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ran Xiaokai <ran.xiaokai@zte.com.cn>
Cc: Stefan Roesch <shr@devkernel.io>
Cc: xu xin <xu.xin16@zte.com.cn>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 5 insertions, 6 deletions

diff --git a/mm/ksm.c b/mm/ksm.c
index 9e99cb12d330..34c4820e0d3d 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -296,7 +296,7 @@ static bool ksm_use_zero_pages __read_mostly;
 static bool ksm_smart_scan = true;
 
 /* The number of zero pages which is placed by KSM */
-unsigned long ksm_zero_pages;
+atomic_long_t ksm_zero_pages = ATOMIC_LONG_INIT(0);
 
 /* The number of pages that have been skipped due to "smart scanning" */
 static unsigned long ksm_pages_skipped;
@@ -1429,8 +1429,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
 		 * the dirty bit in zero page's PTE is set.
 		 */
 		newpte = pte_mkdirty(pte_mkspecial(pfn_pte(page_to_pfn(kpage), vma->vm_page_prot)));
-		ksm_zero_pages++;
-		mm->ksm_zero_pages++;
+		ksm_map_zero_page(mm);
 		/*
 		 * We're replacing an anonymous page with a zero page, which is
 		 * not anonymous. We need to do proper accounting otherwise we
@@ -3374,7 +3373,7 @@ static void wait_while_offlining(void)
 #ifdef CONFIG_PROC_FS
 long ksm_process_profit(struct mm_struct *mm)
 {
-	return (long)(mm->ksm_merging_pages + mm->ksm_zero_pages) * PAGE_SIZE -
+	return (long)(mm->ksm_merging_pages + mm_ksm_zero_pages(mm)) * PAGE_SIZE -
 		mm->ksm_rmap_items * sizeof(struct ksm_rmap_item);
 }
 #endif /* CONFIG_PROC_FS */
@@ -3663,7 +3662,7 @@ KSM_ATTR_RO(pages_skipped);
 static ssize_t ksm_zero_pages_show(struct kobject *kobj,
 				struct kobj_attribute *attr, char *buf)
 {
-	return sysfs_emit(buf, "%ld\n", ksm_zero_pages);
+	return sysfs_emit(buf, "%ld\n", atomic_long_read(&ksm_zero_pages));
 }
 KSM_ATTR_RO(ksm_zero_pages);
 
@@ -3672,7 +3671,7 @@ static ssize_t general_profit_show(struct kobject *kobj,
 {
 	long general_profit;
 
-	general_profit = (ksm_pages_sharing + ksm_zero_pages) * PAGE_SIZE -
+	general_profit = (ksm_pages_sharing + atomic_long_read(&ksm_zero_pages)) * PAGE_SIZE -
 				ksm_rmap_items * sizeof(struct ksm_rmap_item);
 
 	return sysfs_emit(buf, "%ld\n", general_profit);