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V" , Shakeel Butt Subject: [RFC PATCH 1/3] mm/memory-tiers Add functions for tier memory usage in a cgroup Date: Tue, 14 Jun 2022 15:25:33 -0700 Message-Id: <94a10c772c50d378b81dad654476551bfc50e3d7.1655242024.git.tim.c.chen@linux.intel.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1655245574; a=rsa-sha256; cv=none; b=q2PAWfU8rZbBDSxpliEgtihYqZKnimS6S8JIAgVKb6Mn1XZnDUSSBJx4iGeOaT1GNTMRkr J1nRhRMEhE3c/PvN2Dh3h/H0VSB+lj201X2Ny/xa7hGAUqYG38Q/ShjstY6rldSem49piN meSVsdtyQsj6wWEJQrsyahE5V0iSRww= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1655245574; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=PWo8l1dPyH2A/s/NzDCEXhmsBRdOzYL4Ikyr5+UnvPg=; b=pUO1M7Js1mY6hZkGyHp1ziiVI2XfXtwOBB2kZJmi6/ux3kviAMV8jSHE7tUn7VPjcWN74+ J+2rQ0iFinPMeXyf0zX1+pqBTsUmFIXH9VCeqj+C+NZXa3RclqX4Z3Kf/IHkIdUtBGaOd7 /twICh84WXUlh/lUHwCKgVDX1UPdFUA= ARC-Authentication-Results: i=1; imf18.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=NDSZNqlR; dmarc=pass (policy=none) header.from=intel.com; spf=none (imf18.hostedemail.com: domain of tim.c.chen@linux.intel.com has no SPF policy when checking 134.134.136.126) smtp.mailfrom=tim.c.chen@linux.intel.com Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=NDSZNqlR; dmarc=pass (policy=none) header.from=intel.com; spf=none (imf18.hostedemail.com: domain of tim.c.chen@linux.intel.com has no SPF policy when checking 134.134.136.126) smtp.mailfrom=tim.c.chen@linux.intel.com X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 729D71C0092 X-Stat-Signature: hs53w9647ft3au3pxyhrfjm1f3sjmm1x X-HE-Tag: 1655245574-77630 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: Add functions to provide tier based memory usage. This is in preparation for query via sysfs and for controlling a cgroup's top tier memory usage. This patch introduces the tiered memory usage query interface and a simple implementation. A more efficient implementation to get toptier memory usage will be introduced in the next patch. --- include/linux/memory-tiers.h | 2 ++ mm/memcontrol.c | 35 +++++++++++++++++++++++++++++++++++ mm/memory-tiers.c | 3 ++- 3 files changed, 39 insertions(+), 1 deletion(-) diff --git a/include/linux/memory-tiers.h b/include/linux/memory-tiers.h index de4098f6d5d5..1177dcbbdeda 100644 --- a/include/linux/memory-tiers.h +++ b/include/linux/memory-tiers.h @@ -31,6 +31,8 @@ struct memory_tier { }; extern bool numa_demotion_enabled; +extern struct list_head memory_tiers; + int node_create_and_set_memory_tier(int node, int tier); int next_demotion_node(int node); int node_set_memory_tier(int node, int tier); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index abec50f31fe6..2f6e95e6d200 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -63,6 +63,7 @@ #include #include #include +#include #include "internal.h" #include #include @@ -3921,6 +3922,40 @@ static int memcg_numa_stat_show(struct seq_file *m, void *v) return 0; } + +unsigned long mem_cgroup_memtier_usage(struct mem_cgroup *memcg, + struct memory_tier *memtier) +{ + int node; + struct memory_tier *node_tier; + unsigned long usage = 0; + + if (!memcg) + return 0; + + rcu_read_lock(); + for_each_online_node(node) { + node_tier = node_get_memory_tier(node); + if (node_tier == memtier) + usage += mem_cgroup_node_nr_lru_pages(memcg, node, + LRU_ALL, true); + node_put_memory_tier(node_tier); + } + rcu_read_unlock(); + return usage; +} + +unsigned long mem_cgroup_toptier_usage(struct mem_cgroup *memcg) +{ + struct memory_tier *top_tier; + + top_tier = list_first_entry(&memory_tiers, struct memory_tier, list); + if (top_tier) + return mem_cgroup_memtier_usage(memcg, top_tier); + else + return 0; +} + #endif /* CONFIG_NUMA */ static const unsigned int memcg1_stats[] = { diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c index 0dae3114e22c..d552ac1e9d57 100644 --- a/mm/memory-tiers.c +++ b/mm/memory-tiers.c @@ -16,7 +16,8 @@ struct demotion_nodes { #define to_memory_tier(device) container_of(device, struct memory_tier, dev) static void establish_migration_targets(void); static DEFINE_MUTEX(memory_tier_lock); -static LIST_HEAD(memory_tiers); +LIST_HEAD(memory_tiers); +EXPORT_SYMBOL(memory_tiers); static int top_tier_rank; /* * node_demotion[] examples: -- 2.35.1