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Mon, 23 Feb 2026 14:38:34 -0800 (PST) From: Joshua Hahn To: Joshua Hahn Cc: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: [RFC PATCH 1/6] mm/memory-tiers: Introduce tier-aware memcg limit sysfs Date: Mon, 23 Feb 2026 14:38:24 -0800 Message-ID: <20260223223830.586018-2-joshua.hahnjy@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260223223830.586018-1-joshua.hahnjy@gmail.com> References: <20260223223830.586018-1-joshua.hahnjy@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: ebp8kqirjq7ykk5hzgcfdx6f6wicfh79 X-Rspamd-Server: rspam11 X-Rspam-User: X-Rspamd-Queue-Id: 38B1E40004 X-HE-Tag: 1771886316-95470 X-HE-Meta: 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 ygmGLrEM ebsXvxqpQBG4K8/Y9KECWe9zOFmpDA7rYDBhPK+BkkeMzV8IzHRJQSvd4KXqFblDqYshXBDrAuMlDIIZNVJ/WdY576LFTrVtW4zHGAdLzcgTezuGt/auJ47BYoQYDbjl51dvc/1ttpEPO1avQHkn1UMCMacRU79hgcDcocE31WlnFp7ZeB+bXkC2Q0lkL7O3ToARAYgjie0ynJv4WoozIjTM4HB24FDwmLB3BmN92HP4L2bqspodgg2Io8Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Introduce a sysfs entry /sys/kernel/mm/numa/tier_aware_memcg to allow users to toggle between memcg limits that are proportional to the system's toptier:total capacity ratio. Signed-off-by: Joshua Hahn --- include/linux/memory-tiers.h | 1 + mm/memory-tiers.c | 22 ++++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/include/linux/memory-tiers.h b/include/linux/memory-tiers.h index 96987d9d95a8..85440473effb 100644 --- a/include/linux/memory-tiers.h +++ b/include/linux/memory-tiers.h @@ -37,6 +37,7 @@ struct access_coordinate; #ifdef CONFIG_NUMA extern bool numa_demotion_enabled; +extern bool tier_aware_memcg_limits; extern struct memory_dev_type *default_dram_type; extern nodemask_t default_dram_nodes; struct memory_dev_type *alloc_memory_type(int adistance); diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c index 545e34626df7..a88256381519 100644 --- a/mm/memory-tiers.c +++ b/mm/memory-tiers.c @@ -939,6 +939,8 @@ subsys_initcall(memory_tier_init); bool numa_demotion_enabled = false; +bool tier_aware_memcg_limits; + #ifdef CONFIG_MIGRATION #ifdef CONFIG_SYSFS static ssize_t demotion_enabled_show(struct kobject *kobj, @@ -975,8 +977,28 @@ static ssize_t demotion_enabled_store(struct kobject *kobj, static struct kobj_attribute numa_demotion_enabled_attr = __ATTR_RW(demotion_enabled); +static ssize_t tier_aware_memcg_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%s\n", str_true_false(tier_aware_memcg_limits)); +} + +static ssize_t tier_aware_memcg_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + if (kstrtobool(buf, &tier_aware_memcg_limits)) + return -EINVAL; + + return count; +} + +static struct kobj_attribute numa_tier_aware_memcg_attr = + __ATTR_RW(tier_aware_memcg); + static struct attribute *numa_attrs[] = { &numa_demotion_enabled_attr.attr, + &numa_tier_aware_memcg_attr.attr, NULL, }; -- 2.47.3