The patch titled
Subject: mm/memory: fix IO cost for anonymous page
has been added to the -mm tree. Its filename is
mm-memory-fix-io-cost-for-anonymous-page.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memory-fix-io-cost-for-anonymous-page.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory-fix-io-cost-for-anonymous-page.patch
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------------------------------------------------------
From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Subject: mm/memory: fix IO cost for anonymous page
With synchronous IO swap device, swap-in is directly handled in fault
code. Since IO cost notation isn't added there, with synchronous IO swap
device, LRU balancing could be wrongly biased. Fix it to count it in
fault code.
Link: http://lkml.kernel.org/r/1592288204-27734-4-git-send-email-iamjoonsoo.kim@xxxxxxx
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/mm/memory.c~mm-memory-fix-io-cost-for-anonymous-page
+++ a/mm/memory.c
@@ -3143,6 +3143,14 @@ vm_fault_t do_swap_page(struct vm_fault
if (err)
goto out_page;
+ /*
+ * XXX: Move to lru_cache_add() when it
+ * supports new vs putback
+ */
+ spin_lock_irq(&page_pgdat(page)->lru_lock);
+ lru_note_cost_page(page);
+ spin_unlock_irq(&page_pgdat(page)->lru_lock);
+
lru_cache_add(page);
swap_readpage(page, true);
}
_
Patches currently in -mm which might be from iamjoonsoo.kim@xxxxxxx are
mm-swap-fix-for-mm-workingset-age-nonresident-information-alongside-anonymous-pages.patch
mm-memory-fix-io-cost-for-anonymous-page.patch
