pg_numa.h

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/*-------------------------------------------------------------------------
 *
 * pg_numa.h
 *    Basic NUMA portability routines
 *
 *
 * Copyright (c) 2025, PostgreSQL Global Development Group
 *
 * IDENTIFICATION
 *  src/include/port/pg_numa.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_NUMA_H
#define PG_NUMA_H
 
extern PGDLLIMPORT int pg_numa_init(void);
extern PGDLLIMPORT int pg_numa_query_pages(int pid, unsigned long count, void **pages, int *status);
extern PGDLLIMPORT int pg_numa_get_max_node(void);
 
#ifdef USE_LIBNUMA
 
/*
 * This is required on Linux, before pg_numa_query_pages() as we
 * need to page-fault before move_pages(2) syscall returns valid results.
 */
static inline void
pg_numa_touch_mem_if_required(void *ptr)
{
    volatile uint64 touch pg_attribute_unused();
 
    touch = *(volatile uint64 *) ptr;
}
 
#else
 
#define pg_numa_touch_mem_if_required(ptr) \
    do {} while(0)
 
#endif
 
#endif                          /* PG_NUMA_H */