linux-kernel - [PATCH] mm: memcontrol: add file_thp, shmem

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Message-Id: <20201022151844.489337-1-hannes@cmpxchg.org>
Date:   Thu, 22 Oct 2020 11:18:44 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: [PATCH] mm: memcontrol: add file_thp, shmem_thp to memory.stat

As huge page usage in the page cache and for shmem files proliferates
in our production environment, the performance monitoring team has
asked for per-cgroup stats on those pages.

We already track and export anon_thp per cgroup. We already track file
THP and shmem THP per node, so making them per-cgroup is only a matter
of switching from node to lruvec counters. All callsites are in places
where the pages are charged and locked, so page->memcg is stable.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 mm/filemap.c     | 4 ++--
 mm/huge_memory.c | 4 ++--
 mm/khugepaged.c  | 4 ++--
 mm/memcontrol.c  | 6 +++++-
 mm/shmem.c       | 2 +-
 5 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index e80aa9d2db68..334ce608735c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -204,9 +204,9 @@ static void unaccount_page_cache_page(struct address_space *mapping,
 	if (PageSwapBacked(page)) {
 		__mod_lruvec_page_state(page, NR_SHMEM, -nr);
 		if (PageTransHuge(page))
-			__dec_node_page_state(page, NR_SHMEM_THPS);
+			__dec_lruvec_page_state(page, NR_SHMEM_THPS);
 	} else if (PageTransHuge(page)) {
-		__dec_node_page_state(page, NR_FILE_THPS);
+		__dec_lruvec_page_state(page, NR_FILE_THPS);
 		filemap_nr_thps_dec(mapping);
 	}
 
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index cba3812a5c3e..5fe044e5dad5 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2707,9 +2707,9 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
 		spin_unlock(&ds_queue->split_queue_lock);
 		if (mapping) {
 			if (PageSwapBacked(head))
-				__dec_node_page_state(head, NR_SHMEM_THPS);
+				__dec_lruvec_page_state(head, NR_SHMEM_THPS);
 			else
-				__dec_node_page_state(head, NR_FILE_THPS);
+				__dec_lruvec_page_state(head, NR_FILE_THPS);
 		}
 
 		__split_huge_page(page, list, end, flags);
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index f1d5f6dde47c..04828e21f434 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1833,9 +1833,9 @@ static void collapse_file(struct mm_struct *mm,
 	}
 
 	if (is_shmem)
-		__inc_node_page_state(new_page, NR_SHMEM_THPS);
+		__inc_lruvec_page_state(new_page, NR_SHMEM_THPS);
 	else {
-		__inc_node_page_state(new_page, NR_FILE_THPS);
+		__inc_lruvec_page_state(new_page, NR_FILE_THPS);
 		filemap_nr_thps_inc(mapping);
 	}
 
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2636f8bad908..98177d5e8e03 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1507,6 +1507,8 @@ static struct memory_stat memory_stats[] = {
 	 * constant(e.g. powerpc).
 	 */
 	{ "anon_thp", 0, NR_ANON_THPS },
+	{ "file_thp", 0, NR_FILE_THPS },
+	{ "shmem_thp", 0, NR_SHMEM_THPS },
 #endif
 	{ "inactive_anon", PAGE_SIZE, NR_INACTIVE_ANON },
 	{ "active_anon", PAGE_SIZE, NR_ACTIVE_ANON },
@@ -1537,7 +1539,9 @@ static int __init memory_stats_init(void)
 
 	for (i = 0; i < ARRAY_SIZE(memory_stats); i++) {
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-		if (memory_stats[i].idx == NR_ANON_THPS)
+		if (memory_stats[i].idx == NR_ANON_THPS ||
+		    memory_stats[i].idx == NR_FILE_THPS ||
+		    memory_stats[i].idx == NR_SHMEM_THPS)
 			memory_stats[i].ratio = HPAGE_PMD_SIZE;
 #endif
 		VM_BUG_ON(!memory_stats[i].ratio);
diff --git a/mm/shmem.c b/mm/shmem.c
index 537c137698f8..5009d783d954 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -713,7 +713,7 @@ static int shmem_add_to_page_cache(struct page *page,
 		}
 		if (PageTransHuge(page)) {
 			count_vm_event(THP_FILE_ALLOC);
-			__inc_node_page_state(page, NR_SHMEM_THPS);
+			__inc_lruvec_page_state(page, NR_SHMEM_THPS);
 		}
 		mapping->nrpages += nr;
 		__mod_lruvec_page_state(page, NR_FILE_PAGES, nr);
-- 
2.29.0