hakmem/core/box/free_path_stats_box.c

#include "free_path_stats_box.h"
#include <stdio.h>

FreePathStats g_free_path_stats = {0};

// Helper function for pool_api.inc.h (to avoid inline include issues)
void free_path_stat_inc_pool_v1_fast(void) {
    if (__builtin_expect(free_path_stats_enabled(), 0)) {
        g_free_path_stats.pool_v1_fast++;
    }
}

__attribute__((destructor))
static void free_path_stats_dump(void) {
    if (!free_path_stats_enabled()) {
        return;
    }

    fprintf(stderr, "[FREE_PATH_STATS] total=%lu c7_ultra=%lu c6_ultra_free=%lu c6_ultra_alloc=%lu c5_ultra_free=%lu c5_ultra_alloc=%lu c4_ultra_free=%lu c4_ultra_alloc=%lu small_v3=%lu v6=%lu tiny_v1=%lu pool_v1=%lu remote=%lu super_lookup=%lu legacy_fb=%lu\n",
            g_free_path_stats.total_calls,
            g_free_path_stats.c7_ultra_fast,
            g_free_path_stats.c6_ultra_free_fast,  // Phase 4-2
            g_free_path_stats.c6_ultra_alloc_hit,  // Phase 4-4
            g_free_path_stats.c5_ultra_free_fast,  // Phase 5-1
            g_free_path_stats.c5_ultra_alloc_hit,  // Phase 5-2
            g_free_path_stats.c4_ultra_free_fast,  // Phase 6
            g_free_path_stats.c4_ultra_alloc_hit,  // Phase 6
            g_free_path_stats.smallheap_v3_fast,
            g_free_path_stats.smallheap_v6_fast,
            g_free_path_stats.tiny_heap_v1_fast,
            g_free_path_stats.pool_v1_fast,
            g_free_path_stats.remote_free,
            g_free_path_stats.super_lookup_called,
            g_free_path_stats.legacy_fallback);

    // Phase 4-1: Legacy per-class breakdown
    fprintf(stderr, "[FREE_PATH_STATS_LEGACY_BY_CLASS] c0=%lu c1=%lu c2=%lu c3=%lu c4=%lu c5=%lu c6=%lu c7=%lu\n",
            g_free_path_stats.legacy_by_class[0],
            g_free_path_stats.legacy_by_class[1],
            g_free_path_stats.legacy_by_class[2],
            g_free_path_stats.legacy_by_class[3],
            g_free_path_stats.legacy_by_class[4],
            g_free_path_stats.legacy_by_class[5],
            g_free_path_stats.legacy_by_class[6],
            g_free_path_stats.legacy_by_class[7]);

    fflush(stderr);
}