linux-kernel - [PATCH net-next 2/2] net-memcg: Remove redundant tcpmem

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Message-Id: <20230625142820.47185-2-wuyun.abel@bytedance.com>
Date:   Sun, 25 Jun 2023 22:28:11 +0800
From:   Abel Wu <wuyun.abel@...edance.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Ahern <dsahern@...nel.org>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        Yu Zhao <yuzhao@...gle.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Martin KaFai Lau <martin.lau@...nel.org>,
        Alexander Mikhalitsyn <alexander@...alicyn.com>,
        Breno Leitao <leitao@...ian.org>,
        David Howells <dhowells@...hat.com>,
        Jason Xing <kernelxing@...cent.com>,
        Xin Long <lucien.xin@...il.com>
Cc:     Abel Wu <wuyun.abel@...edance.com>, Michal Hocko <mhocko@...e.com>,
        linux-kernel@...r.kernel.org (open list),
        netdev@...r.kernel.org (open list:NETWORKING [GENERAL]),
        cgroups@...r.kernel.org (open list:CONTROL GROUP - MEMORY RESOURCE
        CONTROLLER (MEMCG)),
        linux-mm@...ck.org (open list:CONTROL GROUP - MEMORY RESOURCE
        CONTROLLER (MEMCG))
Subject: [PATCH net-next 2/2] net-memcg: Remove redundant tcpmem_pressure

As {socket,tcpmem}_pressure are only used in default/legacy mode
respectively, use socket_pressure instead of tcpmem_pressure in all
kinds of cgroup hierarchies.

Signed-off-by: Abel Wu <wuyun.abel@...edance.com>
---
 include/linux/memcontrol.h | 3 +--
 mm/memcontrol.c            | 4 ++--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 9b1b536b4ec9..05e9fb5fa08d 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -288,7 +288,6 @@ struct mem_cgroup {
 
 	/* Legacy tcp memory accounting */
 	bool			tcpmem_active;
-	int			tcpmem_pressure;
 
 #ifdef CONFIG_MEMCG_KMEM
 	int kmemcg_id;
@@ -1744,7 +1743,7 @@ void mem_cgroup_sk_free(struct sock *sk);
 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
 {
 	if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
-		return !!memcg->tcpmem_pressure;
+		return !!memcg->socket_pressure;
 	do {
 		if (time_before(jiffies, READ_ONCE(memcg->socket_pressure)))
 			return true;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 4b27e245a055..76c4e5c6e558 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -7337,10 +7337,10 @@ bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
 		struct page_counter *fail;
 
 		if (page_counter_try_charge(&memcg->tcpmem, nr_pages, &fail)) {
-			memcg->tcpmem_pressure = 0;
+			memcg->socket_pressure = 0;
 			return true;
 		}
-		memcg->tcpmem_pressure = 1;
+		memcg->socket_pressure = 1;
 		if (gfp_mask & __GFP_NOFAIL) {
 			page_counter_charge(&memcg->tcpmem, nr_pages);
 			return true;
-- 
2.37.3