+ mm-memory-fix-io-cost-for-anonymous-page.patch added to -mm tree

+ mm-memory-fix-io-cost-for-anonymous-page.patch added to -mm tree

[akpm]

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@lge.com>
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@lge.com
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@lge.com are

mm-swap-fix-for-mm-workingset-age-nonresident-information-alongside-anonymous-pages.patch
mm-memory-fix-io-cost-for-anonymous-page.patch