multifd: Rename used field to num

We will need to split it later in zero_num (number of zero pages) and
normal_num (number of normal pages).  This name is better.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

migration/multifd.c

@@ -252,7 +252,7 @@ static MultiFDPages_t *multifd_pages_init(size_t size)
 
 static void multifd_pages_clear(MultiFDPages_t *pages)
 {
-    pages->used = 0;
+    pages->num = 0;
     pages->allocated = 0;
     pages->packet_num = 0;
     pages->block = NULL;
@@ -270,15 +270,15 @@ static void multifd_send_fill_packet(MultiFDSendParams *p)
 
     packet->flags = cpu_to_be32(p->flags);
     packet->pages_alloc = cpu_to_be32(p->pages->allocated);
-    packet->pages_used = cpu_to_be32(p->pages->used);
+    packet->pages_used = cpu_to_be32(p->pages->num);
     packet->next_packet_size = cpu_to_be32(p->next_packet_size);
     packet->packet_num = cpu_to_be64(p->packet_num);
 
     if (p->pages->block) {
         strncpy(packet->ramblock, p->pages->block->idstr, 256);
     }
 
-    for (i = 0; i < p->pages->used; i++) {
+    for (i = 0; i < p->pages->num; i++) {
         /* there are architectures where ram_addr_t is 32 bit */
         uint64_t temp = p->pages->offset[i];
 
@@ -332,18 +332,18 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
         p->pages = multifd_pages_init(packet->pages_alloc);
     }
 
-    p->pages->used = be32_to_cpu(packet->pages_used);
-    if (p->pages->used > packet->pages_alloc) {
+    p->pages->num = be32_to_cpu(packet->pages_used);
+    if (p->pages->num > packet->pages_alloc) {
         error_setg(errp, "multifd: received packet "
                    "with %d pages and expected maximum pages are %d",
-                   p->pages->used, packet->pages_alloc) ;
+                   p->pages->num, packet->pages_alloc) ;
         return -1;
     }
 
     p->next_packet_size = be32_to_cpu(packet->next_packet_size);
     p->packet_num = be64_to_cpu(packet->packet_num);
 
-    if (p->pages->used == 0) {
+    if (p->pages->num == 0) {
         return 0;
     }
 
@@ -356,7 +356,7 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
         return -1;
     }
 
-    for (i = 0; i < p->pages->used; i++) {
+    for (i = 0; i < p->pages->num; i++) {
         uint64_t offset = be64_to_cpu(packet->offset[i]);
 
         if (offset > (block->used_length - page_size)) {
@@ -443,13 +443,13 @@ static int multifd_send_pages(QEMUFile *f)
         }
         qemu_mutex_unlock(&p->mutex);
     }
-    assert(!p->pages->used);
+    assert(!p->pages->num);
     assert(!p->pages->block);
 
     p->packet_num = multifd_send_state->packet_num++;
     multifd_send_state->pages = p->pages;
     p->pages = pages;
-    transferred = ((uint64_t) pages->used) * qemu_target_page_size()
+    transferred = ((uint64_t) pages->num) * qemu_target_page_size()
                 + p->packet_len;
     qemu_file_update_transfer(f, transferred);
     ram_counters.multifd_bytes += transferred;
@@ -469,12 +469,12 @@ int multifd_queue_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset)
     }
 
     if (pages->block == block) {
-        pages->offset[pages->used] = offset;
-        pages->iov[pages->used].iov_base = block->host + offset;
-        pages->iov[pages->used].iov_len = qemu_target_page_size();
-        pages->used++;
+        pages->offset[pages->num] = offset;
+        pages->iov[pages->num].iov_base = block->host + offset;
+        pages->iov[pages->num].iov_len = qemu_target_page_size();
+        pages->num++;
 
-        if (pages->used < pages->allocated) {
+        if (pages->num < pages->allocated) {
             return 1;
         }
     }
@@ -586,7 +586,7 @@ void multifd_send_sync_main(QEMUFile *f)
     if (!migrate_use_multifd()) {
         return;
     }
-    if (multifd_send_state->pages->used) {
+    if (multifd_send_state->pages->num) {
         if (multifd_send_pages(f) < 0) {
             error_report("%s: multifd_send_pages fail", __func__);
             return;
@@ -649,7 +649,7 @@ static void *multifd_send_thread(void *opaque)
         qemu_mutex_lock(&p->mutex);
 
         if (p->pending_job) {
-            uint32_t used = p->pages->used;
+            uint32_t used = p->pages->num;
             uint64_t packet_num = p->packet_num;
             flags = p->flags;
 
@@ -665,7 +665,7 @@ static void *multifd_send_thread(void *opaque)
             p->flags = 0;
             p->num_packets++;
             p->num_pages += used;
-            p->pages->used = 0;
+            p->pages->num = 0;
             p->pages->block = NULL;
             qemu_mutex_unlock(&p->mutex);
 
@@ -1091,7 +1091,7 @@ static void *multifd_recv_thread(void *opaque)
             break;
         }
 
-        used = p->pages->used;
+        used = p->pages->num;
         flags = p->flags;
         /* recv methods don't know how to handle the SYNC flag */
         p->flags &= ~MULTIFD_FLAG_SYNC;

migration/multifd.h

@@ -55,7 +55,7 @@ typedef struct {
 
 typedef struct {
     /* number of used pages */
-    uint32_t used;
+    uint32_t num;
     /* number of allocated pages */
     uint32_t allocated;
     /* global number of generated multifd packets */