The patch titled
Subject: mm: swap: make should_try_to_free_swap() support large-folio
has been added to the -mm mm-unstable branch. Its filename is
mm-swap-make-should_try_to_free_swap-support-large-folio.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-swap-make-should_try_to_free_swap-support-large-folio.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Chuanhua Han <hanchuanhua@xxxxxxxx>
Subject: mm: swap: make should_try_to_free_swap() support large-folio
Date: Wed, 29 May 2024 20:28:23 +1200
The function should_try_to_free_swap() operates under the assumption that
swap-in always occurs at the normal page granularity, i.e.,
folio_nr_pages() = 1. However, in reality, for large folios,
add_to_swap_cache() will invoke folio_ref_add(folio, nr). To accommodate
large folio swap-in, this patch eliminates this assumption.
Link: https://lkml.kernel.org/r/20240529082824.150954-6-21cnbao@xxxxxxxxx
Signed-off-by: Chuanhua Han <hanchuanhua@xxxxxxxx>
Co-developed-by: Barry Song <v-songbaohua@xxxxxxxx>
Signed-off-by: Barry Song <v-songbaohua@xxxxxxxx>
Acked-by: Chris Li <chrisl@xxxxxxxxxx>
Reviewed-by: Ryan Roberts <ryan.roberts@xxxxxxx>
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Andreas Larsson <andreas@xxxxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Gao Xiang <xiang@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kairui Song <kasong@xxxxxxxxxxx>
Cc: Khalid Aziz <khalid.aziz@xxxxxxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/memory.c~mm-swap-make-should_try_to_free_swap-support-large-folio
+++ a/mm/memory.c
@@ -3925,7 +3925,7 @@ static inline bool should_try_to_free_sw
* reference only in case it's likely that we'll be the exlusive user.
*/
return (fault_flags & FAULT_FLAG_WRITE) && !folio_test_ksm(folio) &&
- folio_ref_count(folio) == 2;
+ folio_ref_count(folio) == (1 + folio_nr_pages(folio));
}
static vm_fault_t pte_marker_clear(struct vm_fault *vmf)
_
Patches currently in -mm which might be from hanchuanhua@xxxxxxxx are
mm-swap-introduce-swap_free_nr-for-batched-swap_free.patch
mm-swap-make-should_try_to_free_swap-support-large-folio.patch
mm-swap-entirely-map-large-folios-found-in-swapcache.patch
