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ram: Remove migration_bitmap_extend()

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We have disabled memory hotplug, so we don't need to handle
migration_bitamp there.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
This commit is contained in:
Juan Quintela 2017-03-22 17:42:01 +01:00
parent b06424de62
commit 66103a5796
3 changed files with 0 additions and 37 deletions
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34
migration/ram.c
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@ -1496,40 +1496,6 @@ static void ram_state_reset(RAMState *rs)
#define MAX_WAIT 50 /* ms, half buffered_file limit */
void migration_bitmap_extend(ram_addr_t old, ram_addr_t new)
{
RAMState *rs = &ram_state;
/* called in qemu main thread, so there is
* no writing race against this migration_bitmap
*/
if (rs->ram_bitmap) {
RAMBitmap *old_bitmap = rs->ram_bitmap, *bitmap;
bitmap = g_new(RAMBitmap, 1);
bitmap->bmap = bitmap_new(new);
/* prevent migration_bitmap content from being set bit
* by migration_bitmap_sync_range() at the same time.
* it is safe to migration if migration_bitmap is cleared bit
* at the same time.
*/
qemu_mutex_lock(&rs->bitmap_mutex);
bitmap_copy(bitmap->bmap, old_bitmap->bmap, old);
bitmap_set(bitmap->bmap, old, new - old);
/* We don't have a way to safely extend the sentmap
* with RCU; so mark it as missing, entry to postcopy
* will fail.
*/
bitmap->unsentmap = NULL;
atomic_rcu_set(&rs->ram_bitmap, bitmap);
qemu_mutex_unlock(&rs->bitmap_mutex);
rs->migration_dirty_pages += new - old;
call_rcu(old_bitmap, migration_bitmap_free, rcu);
}
}
/*
* 'expected' is the value you expect the bitmap mostly to be full
* of; it won't bother printing lines that are all this value.