linux-kernel - [PATCH v6 2/4] mm: add per-order mTHP anon_swpout and anon_swpout

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Message-Id: <20240412114858.407208-3-21cnbao@gmail.com>
Date: Fri, 12 Apr 2024 23:48:56 +1200
From: Barry Song <21cnbao@...il.com>
To: akpm@...ux-foundation.org,
	linux-mm@...ck.org
Cc: cerasuolodomenico@...il.com,
	chrisl@...nel.org,
	david@...hat.com,
	kasong@...cent.com,
	linux-kernel@...r.kernel.org,
	peterx@...hat.com,
	ryan.roberts@....com,
	surenb@...gle.com,
	v-songbaohua@...o.com,
	willy@...radead.org,
	yosryahmed@...gle.com,
	yuzhao@...gle.com,
	corbet@....net
Subject: [PATCH v6 2/4] mm: add per-order mTHP anon_swpout and anon_swpout_fallback counters

From: Barry Song <v-songbaohua@...o.com>

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.

Signed-off-by: Barry Song <v-songbaohua@...o.com>
Reviewed-by: Ryan Roberts <ryan.roberts@....com>
Cc: Chris Li <chrisl@...nel.org>
Cc: David Hildenbrand <david@...hat.com>
Cc: Domenico Cerasuolo <cerasuolodomenico@...il.com>
Cc: Kairui Song <kasong@...cent.com>
Cc: Matthew Wilcox (Oracle) <willy@...radead.org>
Cc: Peter Xu <peterx@...hat.com>
Cc: Ryan Roberts <ryan.roberts@....com>
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: Yosry Ahmed <yosryahmed@...gle.com>
Cc: Yu Zhao <yuzhao@...gle.com>
---
 include/linux/huge_mm.h | 2 ++
 mm/huge_memory.c        | 4 ++++
 mm/page_io.c            | 1 +
 mm/vmscan.c             | 3 +++
 4 files changed, 10 insertions(+)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index d4fdb2641070..7cd07b83a3d0 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -268,6 +268,8 @@ enum mthp_stat_item {
 	MTHP_STAT_ANON_FAULT_ALLOC,
 	MTHP_STAT_ANON_FAULT_FALLBACK,
 	MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
+	MTHP_STAT_ANON_SWPOUT,
+	MTHP_STAT_ANON_SWPOUT_FALLBACK,
 	__MTHP_STAT_COUNT
 };
 
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index dfc38cc83a04..58f2c4745d80 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -555,11 +555,15 @@ static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
 DEFINE_MTHP_STAT_ATTR(anon_fault_alloc, MTHP_STAT_ANON_FAULT_ALLOC);
 DEFINE_MTHP_STAT_ATTR(anon_fault_fallback, MTHP_STAT_ANON_FAULT_FALLBACK);
 DEFINE_MTHP_STAT_ATTR(anon_fault_fallback_charge, MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE);
+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_fault_alloc_attr.attr,
 	&anon_fault_fallback_attr.attr,
 	&anon_fault_fallback_charge_attr.attr,
+	&anon_swpout_attr.attr,
+	&anon_swpout_fallback_attr.attr,
 	NULL,
 };
 
diff --git a/mm/page_io.c b/mm/page_io.c
index a9a7c236aecc..46c603dddf04 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -217,6 +217,7 @@ static inline void count_swpout_vm_event(struct folio *folio)
 		count_memcg_folio_events(folio, THP_SWPOUT, 1);
 		count_vm_event(THP_SWPOUT);
 	}
+	count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_SWPOUT);
 #endif
 	count_vm_events(PSWPOUT, folio_nr_pages(folio));
 }
diff --git a/mm/vmscan.c b/mm/vmscan.c
index bca2d9981c95..49bd94423961 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1231,6 +1231,8 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
 						goto activate_locked;
 				}
 				if (!add_to_swap(folio)) {
+					int __maybe_unused order = folio_order(folio);
+
 					if (!folio_test_large(folio))
 						goto activate_locked_split;
 					/* Fallback to swap normal pages */
@@ -1242,6 +1244,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
 							THP_SWPOUT_FALLBACK, 1);
 						count_vm_event(THP_SWPOUT_FALLBACK);
 					}
+					count_mthp_stat(order, MTHP_STAT_ANON_SWPOUT_FALLBACK);
 #endif
 					if (!add_to_swap(folio))
 						goto activate_locked_split;
-- 
2.34.1