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52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Tools for integrating with lru_gen, like parsing the lru_gen debugfs output.
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*
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* Copyright (C) 2025, Google LLC.
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*/
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#ifndef SELFTEST_KVM_LRU_GEN_UTIL_H
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#define SELFTEST_KVM_LRU_GEN_UTIL_H
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#include <inttypes.h>
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#include <limits.h>
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#include <stdlib.h>
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#include "test_util.h"
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#define MAX_NR_GENS 16 /* MAX_NR_GENS in include/linux/mmzone.h */
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#define MAX_NR_NODES 4 /* Maximum number of nodes supported by the test */
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#define LRU_GEN_DEBUGFS "/sys/kernel/debug/lru_gen"
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#define LRU_GEN_ENABLED_PATH "/sys/kernel/mm/lru_gen/enabled"
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#define LRU_GEN_ENABLED 1
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#define LRU_GEN_MM_WALK 2
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struct generation_stats {
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int gen;
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long age_ms;
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long nr_anon;
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long nr_file;
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};
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struct node_stats {
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int node;
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int nr_gens; /* Number of populated gens entries. */
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struct generation_stats gens[MAX_NR_GENS];
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};
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struct memcg_stats {
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unsigned long memcg_id;
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int nr_nodes; /* Number of populated nodes entries. */
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struct node_stats nodes[MAX_NR_NODES];
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};
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void lru_gen_read_memcg_stats(struct memcg_stats *stats, const char *memcg);
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long lru_gen_sum_memcg_stats(const struct memcg_stats *stats);
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long lru_gen_sum_memcg_stats_for_gen(int gen, const struct memcg_stats *stats);
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void lru_gen_do_aging(struct memcg_stats *stats, const char *memcg);
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int lru_gen_find_generation(const struct memcg_stats *stats,
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unsigned long total_pages);
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bool lru_gen_usable(void);
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#endif /* SELFTEST_KVM_LRU_GEN_UTIL_H */
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