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da99028c21
Replace hardcoded enum values with bpf_core_enum_value() calls in cgroup_iter_memcg test to improve portability across different kernel versions. The change adds runtime enum value resolution for: - node_stat_item: NR_ANON_MAPPED, NR_SHMEM, NR_FILE_PAGES, NR_FILE_MAPPED - vm_event_item: PGFAULT This ensures the BPF program can adapt to enum value changes between kernel versions. Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com> Reviewed-by: JP Kobryn <jp.kobryn@linux.dev> Signed-off-by: Hui Zhu <zhuhui@kylinos.cn> Link: https://lore.kernel.org/r/ca6eb1a1a4fd7a17ffe995acf52c9a4ceb7bac13.1772505399.git.zhuhui@kylinos.cn Signed-off-by: Alexei Starovoitov <ast@kernel.org>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
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#include <vmlinux.h>
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#include <bpf/bpf_core_read.h>
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#include "cgroup_iter_memcg.h"
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char _license[] SEC("license") = "GPL";
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/* The latest values read are stored here. */
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struct memcg_query memcg_query SEC(".data.query");
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SEC("iter.s/cgroup")
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int cgroup_memcg_query(struct bpf_iter__cgroup *ctx)
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{
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struct cgroup *cgrp = ctx->cgroup;
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struct cgroup_subsys_state *css;
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struct mem_cgroup *memcg;
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if (!cgrp)
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return 1;
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css = &cgrp->self;
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memcg = bpf_get_mem_cgroup(css);
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if (!memcg)
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return 1;
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bpf_mem_cgroup_flush_stats(memcg);
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memcg_query.nr_anon_mapped = bpf_mem_cgroup_page_state(
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memcg,
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bpf_core_enum_value(enum node_stat_item, NR_ANON_MAPPED));
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memcg_query.nr_shmem = bpf_mem_cgroup_page_state(
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memcg, bpf_core_enum_value(enum node_stat_item, NR_SHMEM));
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memcg_query.nr_file_pages = bpf_mem_cgroup_page_state(
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memcg, bpf_core_enum_value(enum node_stat_item, NR_FILE_PAGES));
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memcg_query.nr_file_mapped = bpf_mem_cgroup_page_state(
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memcg,
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bpf_core_enum_value(enum node_stat_item, NR_FILE_MAPPED));
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memcg_query.pgfault = bpf_mem_cgroup_vm_events(
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memcg, bpf_core_enum_value(enum vm_event_item, PGFAULT));
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bpf_put_mem_cgroup(memcg);
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return 0;
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}
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