Re: [Qemu-devel] [RFC v2 1/6] memory: get rid of memory_region_destructor_ram_from_ptr()

[Igor Mammedov]

On Mon, 08 Jun 2015 17:23:35 +0200
Paolo Bonzini <address@hidden> wrote:

> 
> 
> On 08/06/2015 17:19, Igor Mammedov wrote:
> > -    qemu_mutex_lock_ramlist();
> > -    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
> > -        if (addr == block->offset) {
> > -            QLIST_REMOVE_RCU(block, next);
> > -            ram_list.mru_block = NULL;
> > -            /* Write list before version */
> > -            smp_wmb();
> > -            ram_list.version++;
> > -            g_free_rcu(block, rcu);
> 
> qemu_ram_free here does:
> 
>             call_rcu(block, reclaim_ramblock, rcu);
> 
> which is different.


qemu_ram_free() calls reclaim_ramblock() which does:

  if (!(block->flags & RAM_PREALLOC))
      free_host_memory()

  g_free(block)

while
  g_free_rcu(block, rcu) results -> g_free(block)

and for memory_region_init_ram_ptr() we set RAM_PREALLOC
so qemu_ram_free() degrades to g_free(block).
 

  

> 
> Paolo
> 
> > -            break;
> > -        }
> > -    }
> > -    qemu_mutex_unlock_ramlist();