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d166453ebd
Use MGLRU's debugfs interface to do access tracking instead of page_idle. The logic to use the page_idle bitmap is left in, as it is useful for kernels that do not have MGLRU built in. When MGLRU is enabled, page_idle will report pages as still idle even after being accessed, as MGLRU doesn't necessarily clear the Idle folio flag when accessing an idle page, so the test will not attempt to use page_idle if MGLRU is enabled but otherwise not usable. Aging pages with MGLRU is much faster than marking pages as idle with page_idle. Co-developed-by: Axel Rasmussen <axelrasmussen@google.com> Signed-off-by: Axel Rasmussen <axelrasmussen@google.com> Signed-off-by: James Houghton <jthoughton@google.com> Link: https://lore.kernel.org/r/20250508184649.2576210-8-jthoughton@google.com [sean: print parsed features, not raw string] Signed-off-by: Sean Christopherson <seanjc@google.com>
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/* 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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