1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */ 3 #include <vmlinux.h> 4 #include <bpf/bpf_core_read.h> 5 #include "cgroup_iter_memcg.h" 6 7 char _license[] SEC("license") = "GPL"; 8 9 /* The latest values read are stored here. */ 10 struct memcg_query memcg_query SEC(".data.query"); 11 12 SEC("iter.s/cgroup") 13 int cgroup_memcg_query(struct bpf_iter__cgroup *ctx) 14 { 15 struct cgroup *cgrp = ctx->cgroup; 16 struct cgroup_subsys_state *css; 17 struct mem_cgroup *memcg; 18 19 if (!cgrp) 20 return 1; 21 22 css = &cgrp->self; 23 memcg = bpf_get_mem_cgroup(css); 24 if (!memcg) 25 return 1; 26 27 bpf_mem_cgroup_flush_stats(memcg); 28 29 memcg_query.nr_anon_mapped = bpf_mem_cgroup_page_state(memcg, NR_ANON_MAPPED); 30 memcg_query.nr_shmem = bpf_mem_cgroup_page_state(memcg, NR_SHMEM); 31 memcg_query.nr_file_pages = bpf_mem_cgroup_page_state(memcg, NR_FILE_PAGES); 32 memcg_query.nr_file_mapped = bpf_mem_cgroup_page_state(memcg, NR_FILE_MAPPED); 33 memcg_query.memcg_kmem = bpf_mem_cgroup_page_state(memcg, MEMCG_KMEM); 34 memcg_query.pgfault = bpf_mem_cgroup_vm_events(memcg, PGFAULT); 35 36 bpf_put_mem_cgroup(memcg); 37 38 return 0; 39 } 40