migration: We don't need the field rate_limit_used anymore

Since previous commit, we calculate how much data we have send with
migration_transferred_bytes() so no need to maintain this counter and
remember to always update it.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20230515195709.63843-10-quintela@redhat.com>

migration/migration-stats.c

@@ -55,15 +55,9 @@ void migration_rate_set(uint64_t limit)
 
 void migration_rate_reset(QEMUFile *f)
 {
-    stat64_set(&mig_stats.rate_limit_used, 0);
     stat64_set(&mig_stats.rate_limit_start, migration_transferred_bytes(f));
 }
 
-void migration_rate_account(uint64_t len)
-{
-    stat64_add(&mig_stats.rate_limit_used, len);
-}
-
 uint64_t migration_transferred_bytes(QEMUFile *f)
 {
     uint64_t multifd = stat64_get(&mig_stats.multifd_bytes);

migration/migration-stats.h

@@ -89,10 +89,6 @@ typedef struct {
      * Maximum amount of data we can send in a cycle.
      */
     Stat64 rate_limit_max;
-    /*
-     * Amount of data we have sent in the current cycle.
-     */
-    Stat64 rate_limit_used;
     /*
      * Total number of bytes transferred.
      */
@@ -105,16 +101,6 @@ typedef struct {
 
 extern MigrationAtomicStats mig_stats;
 
-/**
- * migration_rate_account: Increase the number of bytes transferred.
- *
- * Report on a number of bytes the have been transferred that need to
- * be applied to the rate limiting calcuations.
- *
- * @len: amount of bytes transferred
- */
-void migration_rate_account(uint64_t len);
-
 /**
  * migration_rate_get: Get the maximum amount that can be transferred.
  *

migration/multifd.c

@@ -431,7 +431,6 @@ static int multifd_send_pages(QEMUFile *f)
     multifd_send_state->pages = p->pages;
     p->pages = pages;
     transferred = ((uint64_t) pages->num) * p->page_size + p->packet_len;
-    migration_rate_account(transferred);
     qemu_mutex_unlock(&p->mutex);
     stat64_add(&mig_stats.transferred, transferred);
     stat64_add(&mig_stats.multifd_bytes, transferred);

migration/qemu-file.c

@@ -292,7 +292,6 @@ void qemu_fflush(QEMUFile *f)
             qemu_file_set_error_obj(f, -EIO, local_error);
         } else {
             uint64_t size = iov_size(f->iov, f->iovcnt);
-            migration_rate_account(size);
             f->total_transferred += size;
         }
 
@@ -344,9 +343,6 @@ size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
     if (f->hooks && f->hooks->save_page) {
         int ret = f->hooks->save_page(f, block_offset,
                                       offset, size, bytes_sent);
-        if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
-            migration_rate_account(size);
-        }
 
         if (ret != RAM_SAVE_CONTROL_DELAYED &&
             ret != RAM_SAVE_CONTROL_NOT_SUPP) {