Message ID | 20230404105900.2005-1-flosch@nutanix.com (mailing list archive) |
---|---|
State | New |
Headers | show
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Tue, 4 Apr 2023 10:59:10 +0000 From: Florian Schmidt <flosch@nutanix.com> To: Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@kernel.org>, Roman Gushchin <roman.gushchin@linux.dev>, Shakeel Butt <shakeelb@google.com>, Muchun Song <muchun.song@linux.dev>, Andrew Morton <akpm@linux-foundation.org> Cc: Florian Schmidt <flosch@nutanix.com>, Michal Hocko <mhocko@suse.com>, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH] memcg v1: provide read access to memory.pressure_level Date: Tue, 4 Apr 2023 10:58:59 +0000 Message-Id: <20230404105900.2005-1-flosch@nutanix.com> X-Mailer: git-send-email 2.32.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BYAPR04CA0006.namprd04.prod.outlook.com (2603:10b6:a03:40::19) To BL3PR02MB8217.namprd02.prod.outlook.com (2603:10b6:208:33b::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL3PR02MB8217:EE_|SJ0PR02MB8434:EE_ X-MS-Office365-Filtering-Correlation-Id: 04b22fe1-cda2-4fbc-6a92-08db34fb9e2c x-proofpoint-crosstenant: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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memcg v1: provide read access to memory.pressure_level
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expand
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diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 5abffe6f8389..1aa11e261570 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3734,6 +3734,16 @@ static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css, } } +/* + * This function doesn't do anything useful. Its only job is to provide a read + * handler for a file so that cgroup_file_mode() will add read permissions. + */ +static int mem_cgroup_dummy_seq_show(__always_unused struct seq_file *m, + __always_unused void *v) +{ + return -EINVAL; +} + #ifdef CONFIG_MEMCG_KMEM static int memcg_online_kmem(struct mem_cgroup *memcg) { @@ -5064,6 +5074,7 @@ static struct cftype mem_cgroup_legacy_files[] = { }, { .name = "pressure_level", + .seq_show = mem_cgroup_dummy_seq_show, }, #ifdef CONFIG_NUMA {