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Sorry, list_move can cause some problem when deleting a entry not on list a= ny more (AKA DEBUG_LIST in enabled)
I corrected the patch as the attached.

Best Regards,
Yongmei.
=B7=A2=BC=FE=C8=CB: Yongmei= Xie <yongmeixie@hotmail.com>
=B7=A2=CB=CD=CA=B1=BC=E4: 2021=C4=EA9=D4=C219=C8=D5 23:25
=CA=D5=BC=FE=C8=CB: akpm@linux-foundation.org <akpm@linux-foundat= ion.org>; linux-mm@kvack.org <linux-mm@kvack.org>; linux-kernel@vg= er.kernel.org <linux-kernel@vger.kernel.org>
=B3=AD=CB=CD: yongmeixie@hotmail.com <yongmeixie@hotmail.com><= br> =D6=F7=CC=E2: [PATCH] mm:vmscan: fix extra adjustment for lruvec's n= onresident_age in case of reactivation
 
Before commit #31d8fcac, VM didn't increase nonres= ident_age (AKA inactive age for
file pages) in shrink_page_list. When putback_inactive_pages was converged = with
move_pages_to_lru, both shrink_active_list and shrink_page_list use the sam= e
function to handle move pages to the appropriate lru under lru lock's prote= ction.

At those day, VM didn't increase nonresident_age for second chance promotio= n.
Commit #31d8fcac fix the problem. Definitely, we should account the activat= ion
for second chance. But move_pages_to_lru is used in reactivation in active = lru
as well for protecting code section. So I suggest to add another variable t= o
tell whether reactivation or not.

Signed-off-by: Yongmei Xie <yongmeixie@hotmail.com>
---
 mm/vmscan.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 74296c2d1fed..85ccafcd4912 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2152,7 +2152,8 @@ static int too_many_isolated(struct pglist_data *pgda= t, int file,
  * Returns the number of pages moved to the given lruvec.
  */
 static unsigned int move_pages_to_lru(struct lruvec *lruvec,
-            &n= bsp;            = ;            struct = list_head *list)
+            &n= bsp;            = ;            struct = list_head *list,
+            &n= bsp;            = ;            bool re= activation)
 {
         int nr_pages, nr_moved =3D= 0;
         LIST_HEAD(pages_to_free);<= br> @@ -2203,7 +2204,7 @@ static unsigned int move_pages_to_lru(struct lruvec *= lruvec,
            &nb= sp;    add_page_to_lru_list(page, lruvec);
            &nb= sp;    nr_pages =3D thp_nr_pages(page);
            &nb= sp;    nr_moved +=3D nr_pages;
-            &n= bsp;  if (PageActive(page))
+            &n= bsp;  if (PageActive(page) && !reactivation)
            &nb= sp;            worki= ngset_age_nonresident(lruvec, nr_pages);
         }
 
@@ -2281,7 +2282,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct= lruvec *lruvec,
         nr_reclaimed =3D shrink_pa= ge_list(&page_list, pgdat, sc, &stat, false);
 
         spin_lock_irq(&lruvec-= >lru_lock);
-       move_pages_to_lru(lruvec, &page_l= ist);
+       move_pages_to_lru(lruvec, &page_l= ist, false);
 
         __mod_node_page_state(pgda= t, NR_ISOLATED_ANON + file, -nr_taken);
         item =3D current_is_kswapd= () ? PGSTEAL_KSWAPD : PGSTEAL_DIRECT;
@@ -2418,8 +2419,8 @@ static void shrink_active_list(unsigned long nr_to_sc= an,
          */
         spin_lock_irq(&lruvec-= >lru_lock);
 
-       nr_activate =3D move_pages_to_lru(lru= vec, &l_active);
-       nr_deactivate =3D move_pages_to_lru(l= ruvec, &l_inactive);
+       nr_activate =3D move_pages_to_lru(lru= vec, &l_active, true);
+       nr_deactivate =3D move_pages_to_lru(l= ruvec, &l_inactive, false);
         /* Keep all free pages in = l_active list */
         list_splice(&l_inactiv= e, &l_active);
 
--
2.18.2

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