linux-kernel - [PATCH] MM: handle THP in swap_*page_fs()

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Date:   Mon, 02 May 2022 14:57:46 +1000
From:   "NeilBrown" <neilb@...e.de>
To:     "Miaohe Lin" <linmiaohe@...wei.com>
Cc:     "Andrew Morton" <akpm@...ux-foundation.org>,
        "Geert Uytterhoeven" <geert+renesas@...der.be>,
        "Christoph Hellwig" <hch@....de>, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] MM: handle THP in swap_*page_fs() - count_vm_events()


We need to use count_swpout_vm_event() for sio_write_complete() and
sio_read_complete(), to get correct counting.

This patch should be squased into
    MM: handle THP in swap_*page_fs()

Reported-by: Miaohe Lin <linmiaohe@...wei.com>
Signed-off-by: NeilBrown <neilb@...e.de>
---
 mm/page_io.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/mm/page_io.c b/mm/page_io.c
index d636a3531cad..3e2e9029ce50 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -280,8 +280,10 @@ static void sio_write_complete(struct kiocb *iocb, long ret)
 			set_page_dirty(page);
 			ClearPageReclaim(page);
 		}
-	} else
-		count_vm_events(PSWPOUT, sio->pages);
+	} else {
+		for (p = 0; p < sio->pages; p++)
+			count_swpout_vm_event(sio->bvec[p].bv_page);
+	}
 
 	for (p = 0; p < sio->pages; p++)
 		end_page_writeback(sio->bvec[p].bv_page);
@@ -390,9 +392,9 @@ static void sio_read_complete(struct kiocb *iocb, long ret)
 			struct page *page = sio->bvec[p].bv_page;
 
 			SetPageUptodate(page);
+			count_swpout_vm_event(page);
 			unlock_page(page);
 		}
-		count_vm_events(PSWPIN, sio->pages);
 	} else {
 		for (p = 0; p < sio->pages; p++) {
 			struct page *page = sio->bvec[p].bv_page;
-- 
2.36.0