The patch titled
Subject: mm: add per-order mTHP anon_swpout and anon_swpout_fallback counters
has been added to the -mm mm-unstable branch. Its filename is
mm-add-per-order-mthp-anon_swpout-and-anon_swpout_fallback-counters.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-add-per-order-mthp-anon_swpout-and-anon_swpout_fallback-counters.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: Barry Song <v-songbaohua@xxxxxxxx>
Subject: mm: add per-order mTHP anon_swpout and anon_swpout_fallback counters
Date: Fri, 5 Apr 2024 23:27:04 +1300
This helps to display the fragmentation situation of the swapfile, knowing
the proportion of how much we haven't split large folios. So far, we only
support non-split swapout for anon memory, with the possibility of
expanding to shmem in the future. So, we add the "anon" prefix to the
counter names.
Link: https://lkml.kernel.org/r/20240405102704.77559-3-21cnbao@xxxxxxxxx
Signed-off-by: Barry Song <v-songbaohua@xxxxxxxx>
Cc: Chris Li <chrisl@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Domenico Cerasuolo <cerasuolodomenico@xxxxxxxxx>
Cc: Kairui Song <kasong@xxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/huge_mm.h | 2 ++
mm/huge_memory.c | 4 ++++
mm/page_io.c | 6 +++++-
mm/vmscan.c | 3 +++
4 files changed, 14 insertions(+), 1 deletion(-)
--- a/include/linux/huge_mm.h~mm-add-per-order-mthp-anon_swpout-and-anon_swpout_fallback-counters
+++ a/include/linux/huge_mm.h
@@ -267,6 +267,8 @@ unsigned long thp_vma_allowable_orders(s
enum mthp_stat_item {
MTHP_STAT_ANON_ALLOC,
MTHP_STAT_ANON_ALLOC_FALLBACK,
+ MTHP_STAT_ANON_SWPOUT,
+ MTHP_STAT_ANON_SWPOUT_FALLBACK,
__MTHP_STAT_COUNT
};
--- a/mm/huge_memory.c~mm-add-per-order-mthp-anon_swpout-and-anon_swpout_fallback-counters
+++ a/mm/huge_memory.c
@@ -554,10 +554,14 @@ static struct kobj_attribute _name##_att
DEFINE_MTHP_STAT_ATTR(anon_alloc, MTHP_STAT_ANON_ALLOC);
DEFINE_MTHP_STAT_ATTR(anon_alloc_fallback, MTHP_STAT_ANON_ALLOC_FALLBACK);
+DEFINE_MTHP_STAT_ATTR(anon_swpout, MTHP_STAT_ANON_SWPOUT);
+DEFINE_MTHP_STAT_ATTR(anon_swpout_fallback, MTHP_STAT_ANON_SWPOUT_FALLBACK);
static struct attribute *stats_attrs[] = {
&anon_alloc_attr.attr,
&anon_alloc_fallback_attr.attr,
+ &anon_swpout_attr.attr,
+ &anon_swpout_fallback_attr.attr,
NULL,
};
--- a/mm/page_io.c~mm-add-per-order-mthp-anon_swpout-and-anon_swpout_fallback-counters
+++ a/mm/page_io.c
@@ -212,13 +212,17 @@ int swap_writepage(struct page *page, st
static inline void count_swpout_vm_event(struct folio *folio)
{
+ long nr_pages = folio_nr_pages(folio);
+
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
if (unlikely(folio_test_pmd_mappable(folio))) {
count_memcg_folio_events(folio, THP_SWPOUT, 1);
count_vm_event(THP_SWPOUT);
}
+ if (nr_pages > 0)
+ count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_SWPOUT);
#endif
- count_vm_events(PSWPOUT, folio_nr_pages(folio));
+ count_vm_events(PSWPOUT, nr_pages);
}
#if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP)
--- a/mm/vmscan.c~mm-add-per-order-mthp-anon_swpout-and-anon_swpout_fallback-counters
+++ a/mm/vmscan.c
@@ -1230,6 +1230,9 @@ retry:
count_vm_event(
THP_SWPOUT_FALLBACK);
}
+ if (nr_pages > 0)
+ count_mthp_stat(get_order(nr_pages * PAGE_SIZE),
+ MTHP_STAT_ANON_SWPOUT_FALLBACK);
#endif
if (!add_to_swap(folio))
goto activate_locked_split;
_
Patches currently in -mm which might be from v-songbaohua@xxxxxxxx are
arm64-mm-swap-support-thp_swap-on-hardware-with-mte.patch
mm-hold-ptl-from-the-first-pte-while-reclaiming-a-large-folio.patch
mm-alloc_anon_folio-avoid-doing-vma_thp_gfp_mask-in-fallback-cases.patch
mm-add-per-order-mthp-anon_alloc-and-anon_alloc_fallback-counters.patch
mm-add-per-order-mthp-anon_swpout-and-anon_swpout_fallback-counters.patch
