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ram: Make RAMState dynamic 

We create the variable while we are at migration and we remove it
after migration.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Juan Quintela 2017-05-04 11:46:24 +02:00
parent 9360447d34
commit 53518d9448
1 changed files with 35 additions and 23 deletions
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58
migration/ram.c
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@ -204,11 +204,11 @@ struct RAMState {
};
typedef struct RAMState RAMState;
static RAMState ram_state;
static RAMState *ram_state;
uint64_t ram_bytes_remaining(void)
{
return ram_state.migration_dirty_pages * TARGET_PAGE_SIZE;
return ram_state->migration_dirty_pages * TARGET_PAGE_SIZE;
}
MigrationStats ram_counters;
@ -793,7 +793,7 @@ static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage)
static int do_compress_ram_page(QEMUFile *f, RAMBlock *block,
ram_addr_t offset)
{
RAMState *rs = &ram_state;
RAMState *rs = ram_state;
int bytes_sent, blen;
uint8_t *p = block->host + (offset & TARGET_PAGE_MASK);
@ -1140,7 +1140,7 @@ static void migration_page_queue_free(RAMState *rs)
int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len)
{
RAMBlock *ramblock;
RAMState *rs = &ram_state;
RAMState *rs = ram_state;
ram_counters.postcopy_requests++;
rcu_read_lock();
@ -1361,7 +1361,7 @@ void free_xbzrle_decoded_buf(void)
static void ram_migration_cleanup(void *opaque)
{
RAMState *rs = opaque;
RAMState **rsp = opaque;
RAMBlock *block;
/* caller have hold iothread lock or is in a bh, so there is
@ -1388,7 +1388,9 @@ static void ram_migration_cleanup(void *opaque)
XBZRLE.zero_target_page = NULL;
}
XBZRLE_cache_unlock();
migration_page_queue_free(rs);
migration_page_queue_free(*rsp);
g_free(*rsp);
*rsp = NULL;
}
static void ram_state_reset(RAMState *rs)
@ -1559,7 +1561,7 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, bool unsent_pass,
RAMBlock *block,
PostcopyDiscardState *pds)
{
RAMState *rs = &ram_state;
RAMState *rs = ram_state;
unsigned long *bitmap = block->bmap;
unsigned long *unsentmap = block->unsentmap;
unsigned int host_ratio = block->page_size / TARGET_PAGE_SIZE;
@ -1714,7 +1716,7 @@ static int postcopy_chunk_hostpages(MigrationState *ms, RAMBlock *block)
*/
int ram_postcopy_send_discard_bitmap(MigrationState *ms)
{
RAMState *rs = &ram_state;
RAMState *rs = ram_state;
RAMBlock *block;
int ret;
@ -1797,12 +1799,13 @@ err:
return ret;
}
static int ram_state_init(RAMState *rs)
static int ram_state_init(RAMState **rsp)
{
memset(rs, 0, sizeof(*rs));
qemu_mutex_init(&rs->bitmap_mutex);
qemu_mutex_init(&rs->src_page_req_mutex);
QSIMPLEQ_INIT(&rs->src_page_requests);
*rsp = g_new0(RAMState, 1);
qemu_mutex_init(&(*rsp)->bitmap_mutex);
qemu_mutex_init(&(*rsp)->src_page_req_mutex);
QSIMPLEQ_INIT(&(*rsp)->src_page_requests);
if (migrate_use_xbzrle()) {
XBZRLE_cache_lock();
@ -1813,6 +1816,8 @@ static int ram_state_init(RAMState *rs)
if (!XBZRLE.cache) {
XBZRLE_cache_unlock();
error_report("Error creating cache");
g_free(*rsp);
*rsp = NULL;
return -1;
}
XBZRLE_cache_unlock();
@ -1821,6 +1826,8 @@ static int ram_state_init(RAMState *rs)
XBZRLE.encoded_buf = g_try_malloc0(TARGET_PAGE_SIZE);
if (!XBZRLE.encoded_buf) {
error_report("Error allocating encoded_buf");
g_free(*rsp);
*rsp = NULL;
return -1;
}
@ -1829,6 +1836,8 @@ static int ram_state_init(RAMState *rs)
error_report("Error allocating current_buf");
g_free(XBZRLE.encoded_buf);
XBZRLE.encoded_buf = NULL;
g_free(*rsp);
*rsp = NULL;
return -1;
}
}
@ -1838,7 +1847,7 @@ static int ram_state_init(RAMState *rs)
qemu_mutex_lock_ramlist();
rcu_read_lock();
ram_state_reset(rs);
ram_state_reset(*rsp);
/* Skip setting bitmap if there is no RAM */
if (ram_bytes_total()) {
@ -1860,10 +1869,10 @@ static int ram_state_init(RAMState *rs)
* Count the total number of pages used by ram blocks not including any
* gaps due to alignment or unplugs.
*/
rs->migration_dirty_pages = ram_bytes_total() >> TARGET_PAGE_BITS;
(*rsp)->migration_dirty_pages = ram_bytes_total() >> TARGET_PAGE_BITS;
memory_global_dirty_log_start();
migration_bitmap_sync(rs);
migration_bitmap_sync(*rsp);
qemu_mutex_unlock_ramlist();
qemu_mutex_unlock_iothread();
rcu_read_unlock();
@ -1888,16 +1897,16 @@ static int ram_state_init(RAMState *rs)
*/
static int ram_save_setup(QEMUFile *f, void *opaque)
{
RAMState *rs = opaque;
RAMState **rsp = opaque;
RAMBlock *block;
/* migration has already setup the bitmap, reuse it. */
if (!migration_in_colo_state()) {
if (ram_state_init(rs) < 0) {
if (ram_state_init(rsp) != 0) {
return -1;
}
}
}
rs->f = f;
(*rsp)->f = f;
rcu_read_lock();
@ -1932,7 +1941,8 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
*/
static int ram_save_iterate(QEMUFile *f, void *opaque)
{
RAMState *rs = opaque;
RAMState **temp = opaque;
RAMState *rs = *temp;
int ret;
int i;
int64_t t0;
@ -2007,7 +2017,8 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
*/
static int ram_save_complete(QEMUFile *f, void *opaque)
{
RAMState *rs = opaque;
RAMState **temp = opaque;
RAMState *rs = *temp;
rcu_read_lock();
@ -2044,7 +2055,8 @@ static void ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size,
uint64_t *non_postcopiable_pending,
uint64_t *postcopiable_pending)
{
RAMState *rs = opaque;
RAMState **temp = opaque;
RAMState *rs = *temp;
uint64_t remaining_size;
remaining_size = rs->migration_dirty_pages * TARGET_PAGE_SIZE;