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Message-Id: <20231106183159.3562879-5-nphamcs@gmail.com>
Date: Mon, 6 Nov 2023 10:31:57 -0800
From: Nhat Pham <nphamcs@...il.com>
To: akpm@...ux-foundation.org
Cc: hannes@...xchg.org, cerasuolodomenico@...il.com,
yosryahmed@...gle.com, sjenning@...hat.com, ddstreet@...e.org,
vitaly.wool@...sulko.com, mhocko@...nel.org,
roman.gushchin@...ux.dev, shakeelb@...gle.com,
muchun.song@...ux.dev, chrisl@...nel.org, linux-mm@...ck.org,
kernel-team@...a.com, linux-kernel@...r.kernel.org,
cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kselftest@...r.kernel.org, shuah@...nel.org
Subject: [PATCH v5 4/6] mm: memcg: add per-memcg zswap writeback stat
From: Domenico Cerasuolo <cerasuolodomenico@...il.com>
Since zswap now writes back pages from memcg-specific LRUs, we now need a
new stat to show writebacks count for each memcg.
Suggested-by: Nhat Pham <nphamcs@...il.com>
Signed-off-by: Domenico Cerasuolo <cerasuolodomenico@...il.com>
Signed-off-by: Nhat Pham <nphamcs@...il.com>
---
include/linux/vm_event_item.h | 1 +
mm/memcontrol.c | 1 +
mm/vmstat.c | 1 +
mm/zswap.c | 3 +++
4 files changed, 6 insertions(+)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 8abfa1240040..3153359c3841 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -145,6 +145,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
#ifdef CONFIG_ZSWAP
ZSWPIN,
ZSWPOUT,
+ ZSWP_WB,
#endif
#ifdef CONFIG_X86
DIRECT_MAP_LEVEL2_SPLIT,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2ef49b471a16..e43b5aba8efc 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -593,6 +593,7 @@ static const unsigned int memcg_vm_event_stat[] = {
#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
ZSWPIN,
ZSWPOUT,
+ ZSWP_WB,
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
THP_FAULT_ALLOC,
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 359460deb377..5e5572f3b456 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1401,6 +1401,7 @@ const char * const vmstat_text[] = {
#ifdef CONFIG_ZSWAP
"zswpin",
"zswpout",
+ "zswp_wb",
#endif
#ifdef CONFIG_X86
"direct_map_level2_splits",
diff --git a/mm/zswap.c b/mm/zswap.c
index 2654b0d214cc..03ee41a8b884 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -755,6 +755,9 @@ static enum lru_status shrink_memcg_cb(struct list_head *item, struct list_lru_o
}
zswap_written_back_pages++;
+ if (entry->objcg)
+ count_objcg_event(entry->objcg, ZSWP_WB);
+
/*
* Writeback started successfully, the page now belongs to the
* swapcache. Drop the entry from zswap - unless invalidate already
--
2.34.1
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