C++ (Cpp) vtoslab示例

示例#1

文件： uma_dbg.c 项目： cyrilmagsuci/freebsd

static uma_slab_t
uma_dbg_getslab(uma_zone_t zone, void *item)
{
	uma_slab_t slab;
	uma_keg_t keg;
	uint8_t *mem;

	mem = (uint8_t *)((uintptr_t)item & (~UMA_SLAB_MASK));
	if (zone->uz_flags & UMA_ZONE_VTOSLAB) {
		slab = vtoslab((vm_offset_t)mem);
	} else {
		/*
		 * It is safe to return the slab here even though the
		 * zone is unlocked because the item's allocation state
		 * essentially holds a reference.
		 */
		ZONE_LOCK(zone);
		keg = LIST_FIRST(&zone->uz_kegs)->kl_keg;
		if (keg->uk_flags & UMA_ZONE_HASH)
			slab = hash_sfind(&keg->uk_hash, mem);
		else
			slab = (uma_slab_t)(mem + keg->uk_pgoff);
		ZONE_UNLOCK(zone);
	}

	return (slab);
}

示例#2

文件： uma_dbg.c 项目： FelixHaller/libuinet

static uma_slab_t
uma_dbg_getslab(uma_zone_t zone, void *item)
{
	uma_slab_t slab;
	uma_keg_t keg;
	u_int8_t *mem;

	mem = (u_int8_t *)((unsigned long)item & (~UMA_SLAB_MASK));
	if (zone->uz_flags & UMA_ZONE_VTOSLAB) {
		slab = vtoslab((vm_offset_t)mem);
	} else {
		keg = LIST_FIRST(&zone->uz_kegs)->kl_keg;
		if (keg->uk_flags & UMA_ZONE_HASH)
			slab = hash_sfind(&keg->uk_hash, mem);
		else
			slab = (uma_slab_t)(mem + keg->uk_pgoff);
	}

	return (slab);
}

示例#3

文件： uma_dbg.c 项目： RajasekharBhumi/L4Re

static uma_slab_t
uma_dbg_getslab(uma_zone_t zone, void *item)
{
	uma_slab_t slab;
	uma_keg_t keg;
	u_int8_t *mem;

	keg = zone->uz_keg;
	mem = (u_int8_t *)((unsigned long)item & (~UMA_SLAB_MASK));
	if (keg->uk_flags & UMA_ZONE_MALLOC) {
		slab = vtoslab((vm_offset_t)mem);
	} else if (keg->uk_flags & UMA_ZONE_HASH) {
		slab = hash_sfind(&keg->uk_hash, mem);
	} else {
		mem += keg->uk_pgoff;
		slab = (uma_slab_t)mem;
	}

	return (slab);
}