linux-kernel - [PATCH mm-unstable v1 2/2] mm, swap: add pages allocated for struct swap

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Message-ID: <20241031224551.1736113-3-kinseyho@google.com>
Date: Thu, 31 Oct 2024 22:45:51 +0000
From: Kinsey Ho <kinseyho@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Shakeel Butt <shakeel.butt@...ux.dev>, 
	Muchun Song <muchun.song@...ux.dev>, Pasha Tatashin <pasha.tatashin@...een.com>, 
	David Rientjes <rientjes@...gle.com>, willy@...radead.org, Vlastimil Babka <vbabka@...e.cz>, 
	David Hildenbrand <david@...hat.com>, Kinsey Ho <kinseyho@...gle.com>, 
	Joel Granados <joel.granados@...nel.org>, Kaiyang Zhao <kaiyang2@...cmu.edu>, 
	Sourav Panda <souravpanda@...gle.com>, linux-kernel@...r.kernel.org, 
	cgroups@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH mm-unstable v1 2/2] mm, swap: add pages allocated for struct
 swap_cgroup to vmstat

Export the number of pages allocated for storing struct swap_cgroup in
vmstat using global system-wide counters.

Signed-off-by: Kinsey Ho <kinseyho@...gle.com>
---
 include/linux/vmstat.h | 3 +++
 mm/swap_cgroup.c       | 3 +++
 mm/vmstat.c            | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index ac4d42c4fabd..227e951d1219 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -41,6 +41,9 @@ enum vm_stat_item {
 	NR_DIRTY_BG_THRESHOLD,
 	NR_MEMMAP_PAGES,	/* page metadata allocated through buddy allocator */
 	NR_MEMMAP_BOOT_PAGES,	/* page metadata allocated through boot allocator */
+#if defined(CONFIG_MEMCG) && defined(CONFIG_SWAP)
+	NR_SWAP_CGROUP_PAGES,	/* allocated to store struct swap_cgroup */
+#endif
 	NR_VM_STAT_ITEMS,
 };
 
diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c
index da1278f0563b..82eda8a3efe1 100644
--- a/mm/swap_cgroup.c
+++ b/mm/swap_cgroup.c
@@ -53,6 +53,8 @@ static int swap_cgroup_prepare(int type)
 		if (!(idx % SWAP_CLUSTER_MAX))
 			cond_resched();
 	}
+	mod_global_page_state(NR_SWAP_CGROUP_PAGES, ctrl->length);
+
 	return 0;
 not_enough_page:
 	max = idx;
@@ -228,6 +230,7 @@ void swap_cgroup_swapoff(int type)
 			if (!(i % SWAP_CLUSTER_MAX))
 				cond_resched();
 		}
+		mod_global_page_state(NR_SWAP_CGROUP_PAGES, -length);
 		vfree(map);
 	}
 }
diff --git a/mm/vmstat.c b/mm/vmstat.c
index e5a6dd5106c2..259574261ec1 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1295,6 +1295,9 @@ const char * const vmstat_text[] = {
 	"nr_dirty_background_threshold",
 	"nr_memmap_pages",
 	"nr_memmap_boot_pages",
+#if defined(CONFIG_MEMCG) && defined(CONFIG_SWAP)
+	"nr_swap_cgroup_pages",
+#endif
 
 #if defined(CONFIG_VM_EVENT_COUNTERS) || defined(CONFIG_MEMCG)
 	/* enum vm_event_item counters */
-- 
2.47.0.163.g1226f6d8fa-goog