linux-kernel - [PATCH v2 2/2] memcg: remove unused do_memsw_account in memcg1_stat

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Message-ID: <20230915105845.3199656-3-liushixin2@huawei.com>
Date:   Fri, 15 Sep 2023 18:58:45 +0800
From:   Liu Shixin <liushixin2@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        Michal Koutný <mkoutny@...e.com>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Michal Hocko <mhocko@...nel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Liu Shixin <liushixin2@...wei.com>
Subject: [PATCH v2 2/2] memcg: remove unused do_memsw_account in memcg1_stat_format

Since commit b25806dcd3d5("mm: memcontrol: deprecate swapaccounting=0 mode")
do_memsw_account() is synonymous with !cgroup_subsys_on_dfl(memory_cgrp_subsys),
It always equals true in memcg1_stat_format(). Remove the unused code.

Suggested-by: Michal Koutný <mkoutny@...e.com>
Signed-off-by: Liu Shixin <liushixin2@...wei.com>
---
 mm/memcontrol.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 78ea10c5a636..bb9a617be046 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4112,8 +4112,6 @@ static void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s)
 	for (i = 0; i < ARRAY_SIZE(memcg1_stats); i++) {
 		unsigned long nr;
 
-		if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account())
-			continue;
 		nr = memcg_page_state_local(memcg, memcg1_stats[i]);
 		seq_buf_printf(s, "%s %lu\n", memcg1_stat_names[i],
 			   nr * memcg_page_state_unit(memcg1_stats[i]));
@@ -4136,15 +4134,12 @@ static void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s)
 	}
 	seq_buf_printf(s, "hierarchical_memory_limit %llu\n",
 		       (u64)memory * PAGE_SIZE);
-	if (do_memsw_account())
-		seq_buf_printf(s, "hierarchical_memsw_limit %llu\n",
-			       (u64)memsw * PAGE_SIZE);
+	seq_buf_printf(s, "hierarchical_memsw_limit %llu\n",
+		       (u64)memsw * PAGE_SIZE);
 
 	for (i = 0; i < ARRAY_SIZE(memcg1_stats); i++) {
 		unsigned long nr;
 
-		if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account())
-			continue;
 		nr = memcg_page_state(memcg, memcg1_stats[i]);
 		seq_buf_printf(s, "total_%s %llu\n", memcg1_stat_names[i],
 			   (u64)nr * memcg_page_state_unit(memcg1_stats[i]));
-- 
2.25.1