vulkan: reduce struct vk_object_base by 8 bytes

I know that, in the grand scheme of things, this isn't significant.
The problem is: now that I know the hole is there, my OCD won't allow
me to sleep until it's fixed.

We went from:

struct vk_object_base {
	VK_LOADER_DATA             _loader_data;         /*     0     8 */
	VkObjectType               type;                 /*     8     4 */

	/* XXX 4 bytes hole, try to pack */

	struct vk_device *         device;               /*    16     8 */
	struct vk_instance *       instance;             /*    24     8 */
	_Bool                      client_visible;       /*    32     1 */

	/* XXX 7 bytes hole, try to pack */

	struct util_sparse_array   private_data;         /*    40    24 */
	/* --- cacheline 1 boundary (64 bytes) --- */
	char *                     object_name;          /*    64     8 */

	/* size: 72, cachelines: 2, members: 7 */
	/* sum members: 61, holes: 2, sum holes: 11 */
	/* last cacheline: 8 bytes */
};

to:

struct vk_object_base {
	VK_LOADER_DATA             _loader_data;         /*     0     8 */
	VkObjectType               type;                 /*     8     4 */
	_Bool                      client_visible;       /*    12     1 */

	/* XXX 3 bytes hole, try to pack */

	struct vk_device *         device;               /*    16     8 */
	struct vk_instance *       instance;             /*    24     8 */
	struct util_sparse_array   private_data;         /*    32    24 */
	char *                     object_name;          /*    56     8 */

	/* size: 64, cachelines: 1, members: 7 */
	/* sum members: 61, holes: 1, sum holes: 3 */
};

which is cool because now the struct nicely fits in a cacheline.

Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28699>

src/vulkan/runtime/vk_object.c

@@ -38,9 +38,9 @@ vk_object_base_init(struct vk_device *device,
 {
    base->_loader_data.loaderMagic = ICD_LOADER_MAGIC;
    base->type = obj_type;
+   base->client_visible = false;
    base->device = device;
    base->instance = NULL;
-   base->client_visible = false;
    base->object_name = NULL;
    util_sparse_array_init(&base->private_data, sizeof(uint64_t), 8);
 }
@@ -51,9 +51,9 @@ void vk_object_base_instance_init(struct vk_instance *instance,
 {
    base->_loader_data.loaderMagic = ICD_LOADER_MAGIC;
    base->type = obj_type;
+   base->client_visible = false;
    base->device = NULL;
    base->instance = instance;
-   base->client_visible = false;
    base->object_name = NULL;
    util_sparse_array_init(&base->private_data, sizeof(uint64_t), 8);
 }

src/vulkan/runtime/vk_object.h

@@ -50,6 +50,9 @@ struct vk_object_base {
     */
    VkObjectType type;
 
+   /* True if this object is fully constructed and visible to the client */
+   bool client_visible;
+
    /** Pointer to the device in which this object exists, if any
     *
     * This is NULL for instances and physical devices but should point to a
@@ -66,9 +69,6 @@ struct vk_object_base {
     */
    struct vk_instance *instance;
 
-   /* True if this object is fully constructed and visible to the client */
-   bool client_visible;
-
    /* For VK_EXT_private_data */
    struct util_sparse_array private_data;