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Subject[PATCH v2] MM: handle THP in swap_*page_fs() - count_vm_events()
Date

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

Note that THP swap in (if it ever happens) is current accounted 1 for
each page, whether HUGE or normal. This is different from swap-out
accounting.

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

Reported-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---
mm/page_io.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/page_io.c b/mm/page_io.c
index d636a3531cad..1b8075ef3418 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);
--
2.36.0
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