+ mm-memcontrol-add-pgscanpgsteal_kswapddirect-items-in-memorystat-of-cgroup-v2.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm: memcontrol: add {pgscan,pgsteal}_{kswapd,direct} items in memory.stat of cgroup v2
has been added to the -mm mm-unstable branch.  Its filename is
     mm-memcontrol-add-pgscanpgsteal_kswapddirect-items-in-memorystat-of-cgroup-v2.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memcontrol-add-pgscanpgsteal_kswapddirect-items-in-memorystat-of-cgroup-v2.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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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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------------------------------------------------------
From: Qi Zheng <zhengqi.arch@bytedance.com>
Subject: mm: memcontrol: add {pgscan,pgsteal}_{kswapd,direct} items in memory.stat of cgroup v2
Date: Sat, 4 Jun 2022 16:22:09 +0800

There are already statistics of {pgscan,pgsteal}_kswapd and
{pgscan,pgsteal}_direct of memcg event here, but now only the sum of the
two is displayed in memory.stat of cgroup v2.

In order to obtain more accurate information during monitoring and
debugging, and to align with the display in /proc/vmstat, it better to
display {pgscan,pgsteal}_kswapd and {pgscan,pgsteal}_direct separately.

Also, for forward compatibility, we still display pgscan and pgsteal items
so that it won't break existing applications.

Link: https://lkml.kernel.org/r/20220604082209.55174-1-zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Muchun Song <songmuchun@bytedance.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/admin-guide/cgroup-v2.rst |   12 ++++
 mm/memcontrol.c                         |   54 ++++++++++------------
 2 files changed, 38 insertions(+), 28 deletions(-)

--- a/Documentation/admin-guide/cgroup-v2.rst~mm-memcontrol-add-pgscanpgsteal_kswapddirect-items-in-memorystat-of-cgroup-v2
+++ a/Documentation/admin-guide/cgroup-v2.rst
@@ -1445,9 +1445,21 @@ PAGE_SIZE multiple when read back.
 	  pgscan (npn)
 		Amount of scanned pages (in an inactive LRU list)
 
+	  pgscan_kswapd (npn)
+		Amount of scanned pages by kswapd (in an inactive LRU list)
+
+	  pgscan_direct (npn)
+		Amount of scanned pages directly  (in an inactive LRU list)
+
 	  pgsteal (npn)
 		Amount of reclaimed pages
 
+	  pgsteal_kswapd (npn)
+		Amount of reclaimed pages by kswapd
+
+	  pgsteal_direct (npn)
+		Amount of reclaimed pages directly
+
 	  pgactivate (npn)
 		Amount of pages moved to the active LRU list
 
--- a/mm/memcontrol.c~mm-memcontrol-add-pgscanpgsteal_kswapddirect-items-in-memorystat-of-cgroup-v2
+++ a/mm/memcontrol.c
@@ -1460,6 +1460,28 @@ static inline unsigned long memcg_page_s
 	return memcg_page_state(memcg, item) * memcg_page_state_unit(item);
 }
 
+static const unsigned int memcg_vm_event_stat[] = {
+	PGSCAN_KSWAPD,
+	PGSCAN_DIRECT,
+	PGSTEAL_KSWAPD,
+	PGSTEAL_DIRECT,
+	PGFAULT,
+	PGMAJFAULT,
+	PGREFILL,
+	PGACTIVATE,
+	PGDEACTIVATE,
+	PGLAZYFREE,
+	PGLAZYFREED,
+#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
+	ZSWPIN,
+	ZSWPOUT,
+#endif
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+	THP_FAULT_ALLOC,
+	THP_COLLAPSE_ALLOC,
+#endif
+};
+
 static char *memory_stat_format(struct mem_cgroup *memcg)
 {
 	struct seq_buf s;
@@ -1495,41 +1517,17 @@ static char *memory_stat_format(struct m
 	}
 
 	/* Accumulated memory events */
-
-	seq_buf_printf(&s, "%s %lu\n", vm_event_name(PGFAULT),
-		       memcg_events(memcg, PGFAULT));
-	seq_buf_printf(&s, "%s %lu\n", vm_event_name(PGMAJFAULT),
-		       memcg_events(memcg, PGMAJFAULT));
-	seq_buf_printf(&s, "%s %lu\n",  vm_event_name(PGREFILL),
-		       memcg_events(memcg, PGREFILL));
 	seq_buf_printf(&s, "pgscan %lu\n",
 		       memcg_events(memcg, PGSCAN_KSWAPD) +
 		       memcg_events(memcg, PGSCAN_DIRECT));
 	seq_buf_printf(&s, "pgsteal %lu\n",
 		       memcg_events(memcg, PGSTEAL_KSWAPD) +
 		       memcg_events(memcg, PGSTEAL_DIRECT));
-	seq_buf_printf(&s, "%s %lu\n", vm_event_name(PGACTIVATE),
-		       memcg_events(memcg, PGACTIVATE));
-	seq_buf_printf(&s, "%s %lu\n", vm_event_name(PGDEACTIVATE),
-		       memcg_events(memcg, PGDEACTIVATE));
-	seq_buf_printf(&s, "%s %lu\n", vm_event_name(PGLAZYFREE),
-		       memcg_events(memcg, PGLAZYFREE));
-	seq_buf_printf(&s, "%s %lu\n", vm_event_name(PGLAZYFREED),
-		       memcg_events(memcg, PGLAZYFREED));
 
-#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
-	seq_buf_printf(&s, "%s %lu\n", vm_event_name(ZSWPIN),
-		       memcg_events(memcg, ZSWPIN));
-	seq_buf_printf(&s, "%s %lu\n", vm_event_name(ZSWPOUT),
-		       memcg_events(memcg, ZSWPOUT));
-#endif
-
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	seq_buf_printf(&s, "%s %lu\n", vm_event_name(THP_FAULT_ALLOC),
-		       memcg_events(memcg, THP_FAULT_ALLOC));
-	seq_buf_printf(&s, "%s %lu\n", vm_event_name(THP_COLLAPSE_ALLOC),
-		       memcg_events(memcg, THP_COLLAPSE_ALLOC));
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+	for (i = 0; i < ARRAY_SIZE(memcg_vm_event_stat); i++)
+		seq_buf_printf(&s, "%s %lu\n",
+			       vm_event_name(memcg_vm_event_stat[i]),
+			       memcg_events(memcg, memcg_vm_event_stat[i]));
 
 	/* The above should easily fit into one page */
 	WARN_ON_ONCE(seq_buf_has_overflowed(&s));
_

Patches currently in -mm which might be from zhengqi.arch@bytedance.com are

mm-memcontrol-add-pgscanpgsteal_kswapddirect-items-in-memorystat-of-cgroup-v2.patch