* THE SOFTWARE.
*/
#include "qemu/osdep.h"
-#include "qemu-common.h"
#include "cpu.h"
#include <zlib.h>
#include "qapi-event.h"
#include "qemu/cutils.h"
#include "qemu/bitops.h"
#include "qemu/bitmap.h"
-#include "qemu/timer.h"
#include "qemu/main-loop.h"
-#include "migration/migration.h"
-#include "migration/postcopy-ram.h"
-#include "exec/address-spaces.h"
+#include "xbzrle.h"
+#include "ram.h"
+#include "migration.h"
+#include "migration/register.h"
+#include "migration/misc.h"
+#include "qemu-file.h"
+#include "postcopy-ram.h"
#include "migration/page_cache.h"
#include "qemu/error-report.h"
#include "trace.h"
/***********************************************************/
/* ram save/restore */
+/* RAM_SAVE_FLAG_ZERO used to be named RAM_SAVE_FLAG_COMPRESS, it
+ * worked for pages that where filled with the same char. We switched
+ * it to only search for the zero value. And to avoid confusion with
+ * RAM_SSAVE_FLAG_COMPRESS_PAGE just rename it.
+ */
+
#define RAM_SAVE_FLAG_FULL 0x01 /* Obsolete, not used anymore */
-#define RAM_SAVE_FLAG_COMPRESS 0x02
+#define RAM_SAVE_FLAG_ZERO 0x02
#define RAM_SAVE_FLAG_MEM_SIZE 0x04
#define RAM_SAVE_FLAG_PAGE 0x08
#define RAM_SAVE_FLAG_EOS 0x10
/* 0x80 is reserved in migration.h start with 0x100 next */
#define RAM_SAVE_FLAG_COMPRESS_PAGE 0x100
-static uint8_t *ZERO_TARGET_PAGE;
-
static inline bool is_zero_range(uint8_t *p, uint64_t size)
{
return buffer_is_zero(p, size);
}
+XBZRLECacheStats xbzrle_counters;
+
/* struct contains XBZRLE cache and a static page
used by the compression */
static struct {
/* Cache for XBZRLE, Protected by lock. */
PageCache *cache;
QemuMutex lock;
+ /* it will store a page full of zeros */
+ uint8_t *zero_target_page;
+ /* buffer used for XBZRLE decoding */
+ uint8_t *decoded_buf;
} XBZRLE;
-/* buffer used for XBZRLE decoding */
-static uint8_t *xbzrle_decoded_buf;
-
static void XBZRLE_cache_lock(void)
{
if (migrate_use_xbzrle())
return ret;
}
-struct RAMBitmap {
- struct rcu_head rcu;
- /* Main migration bitmap */
- unsigned long *bmap;
- /* bitmap of pages that haven't been sent even once
- * only maintained and used in postcopy at the moment
- * where it's used to send the dirtymap at the start
- * of the postcopy phase
- */
- unsigned long *unsentmap;
-};
-typedef struct RAMBitmap RAMBitmap;
-
/*
* An outstanding page request, on the source, having been received
* and queued
RAMBlock *last_seen_block;
/* Last block from where we have sent data */
RAMBlock *last_sent_block;
- /* Last offset we have sent data from */
- ram_addr_t last_offset;
+ /* Last dirty target page we have sent */
+ ram_addr_t last_page;
/* last ram version we have seen */
uint32_t last_version;
/* We are in the first round */
bool ram_bulk_stage;
/* How many times we have dirty too many pages */
int dirty_rate_high_cnt;
- /* How many times we have synchronized the bitmap */
- uint64_t bitmap_sync_count;
/* these variables are used for bitmap sync */
/* last time we did a full bitmap_sync */
int64_t time_last_bitmap_sync;
uint64_t xbzrle_cache_miss_prev;
/* number of iterations at the beginning of period */
uint64_t iterations_prev;
- /* Accounting fields */
- /* number of zero pages. It used to be pages filled by the same char. */
- uint64_t zero_pages;
- /* number of normal transferred pages */
- uint64_t norm_pages;
/* Iterations since start */
uint64_t iterations;
- /* xbzrle transmitted bytes. Notice that this is with
- * compression, they can't be calculated from the pages */
- uint64_t xbzrle_bytes;
- /* xbzrle transmmited pages */
- uint64_t xbzrle_pages;
- /* xbzrle number of cache miss */
- uint64_t xbzrle_cache_miss;
- /* xbzrle miss rate */
- double xbzrle_cache_miss_rate;
- /* xbzrle number of overflows */
- uint64_t xbzrle_overflows;
/* number of dirty bits in the bitmap */
uint64_t migration_dirty_pages;
- /* total number of bytes transferred */
- uint64_t bytes_transferred;
- /* number of dirtied pages in the last second */
- uint64_t dirty_pages_rate;
- /* Count of requests incoming from destination */
- uint64_t postcopy_requests;
/* protects modification of the bitmap */
QemuMutex bitmap_mutex;
- /* Ram Bitmap protected by RCU */
- RAMBitmap *ram_bitmap;
/* The RAMBlock used in the last src_page_requests */
RAMBlock *last_req_rb;
/* Queue of outstanding page requests from the destination */
};
typedef struct RAMState RAMState;
-static RAMState ram_state;
-
-uint64_t dup_mig_pages_transferred(void)
-{
- return ram_state.zero_pages;
-}
-
-uint64_t norm_mig_pages_transferred(void)
-{
- return ram_state.norm_pages;
-}
-
-uint64_t xbzrle_mig_bytes_transferred(void)
-{
- return ram_state.xbzrle_bytes;
-}
-
-uint64_t xbzrle_mig_pages_transferred(void)
-{
- return ram_state.xbzrle_pages;
-}
-
-uint64_t xbzrle_mig_pages_cache_miss(void)
-{
- return ram_state.xbzrle_cache_miss;
-}
-
-double xbzrle_mig_cache_miss_rate(void)
-{
- return ram_state.xbzrle_cache_miss_rate;
-}
-
-uint64_t xbzrle_mig_pages_overflow(void)
-{
- return ram_state.xbzrle_overflows;
-}
-
-uint64_t ram_bytes_transferred(void)
-{
- return ram_state.bytes_transferred;
-}
+static RAMState *ram_state;
uint64_t ram_bytes_remaining(void)
{
- return ram_state.migration_dirty_pages * TARGET_PAGE_SIZE;
-}
-
-uint64_t ram_dirty_sync_count(void)
-{
- return ram_state.bitmap_sync_count;
-}
-
-uint64_t ram_dirty_pages_rate(void)
-{
- return ram_state.dirty_pages_rate;
+ return ram_state->migration_dirty_pages * TARGET_PAGE_SIZE;
}
-uint64_t ram_postcopy_requests(void)
-{
- return ram_state.postcopy_requests;
-}
+MigrationStats ram_counters;
/* used by the search for pages to send */
struct PageSearchStatus {
/* Current block being searched */
RAMBlock *block;
- /* Current offset to search from */
- ram_addr_t offset;
+ /* Current page to search from */
+ unsigned long page;
/* Set once we wrap around */
bool complete_round;
};
/* The empty QEMUFileOps will be used by file in CompressParam */
static const QEMUFileOps empty_ops = { };
-static bool compression_switch;
static DecompressParam *decomp_param;
static QemuThread *decompress_threads;
static QemuMutex decomp_done_lock;
}
}
-void migrate_compress_threads_join(void)
+static void compress_threads_save_cleanup(void)
{
int i, thread_count;
comp_param = NULL;
}
-void migrate_compress_threads_create(void)
+static void compress_threads_save_setup(void)
{
int i, thread_count;
if (!migrate_use_compression()) {
return;
}
- compression_switch = true;
thread_count = migrate_compress_threads();
compress_threads = g_new0(QemuThread, thread_count);
comp_param = g_new0(CompressParam, thread_count);
* @offset: offset inside the block for the page
* in the lower bits, it contains flags
*/
-static size_t save_page_header(QEMUFile *f, RAMBlock *block, ram_addr_t offset)
+static size_t save_page_header(RAMState *rs, QEMUFile *f, RAMBlock *block,
+ ram_addr_t offset)
{
size_t size, len;
+ if (block == rs->last_sent_block) {
+ offset |= RAM_SAVE_FLAG_CONTINUE;
+ }
qemu_put_be64(f, offset);
size = 8;
qemu_put_byte(f, len);
qemu_put_buffer(f, (uint8_t *)block->idstr, len);
size += 1 + len;
+ rs->last_sent_block = block;
}
return size;
}
/* We don't care if this fails to allocate a new cache page
* as long as it updated an old one */
- cache_insert(XBZRLE.cache, current_addr, ZERO_TARGET_PAGE,
- rs->bitmap_sync_count);
+ cache_insert(XBZRLE.cache, current_addr, XBZRLE.zero_target_page,
+ ram_counters.dirty_sync_count);
}
#define ENCODING_FLAG_XBZRLE 0x1
int encoded_len = 0, bytes_xbzrle;
uint8_t *prev_cached_page;
- if (!cache_is_cached(XBZRLE.cache, current_addr, rs->bitmap_sync_count)) {
- rs->xbzrle_cache_miss++;
+ if (!cache_is_cached(XBZRLE.cache, current_addr,
+ ram_counters.dirty_sync_count)) {
+ xbzrle_counters.cache_miss++;
if (!last_stage) {
if (cache_insert(XBZRLE.cache, current_addr, *current_data,
- rs->bitmap_sync_count) == -1) {
+ ram_counters.dirty_sync_count) == -1) {
return -1;
} else {
/* update *current_data when the page has been
return 0;
} else if (encoded_len == -1) {
trace_save_xbzrle_page_overflow();
- rs->xbzrle_overflows++;
+ xbzrle_counters.overflow++;
/* update data in the cache */
if (!last_stage) {
memcpy(prev_cached_page, *current_data, TARGET_PAGE_SIZE);
}
/* Send XBZRLE based compressed page */
- bytes_xbzrle = save_page_header(rs->f, block,
+ bytes_xbzrle = save_page_header(rs, rs->f, block,
offset | RAM_SAVE_FLAG_XBZRLE);
qemu_put_byte(rs->f, ENCODING_FLAG_XBZRLE);
qemu_put_be16(rs->f, encoded_len);
qemu_put_buffer(rs->f, XBZRLE.encoded_buf, encoded_len);
bytes_xbzrle += encoded_len + 1 + 2;
- rs->xbzrle_pages++;
- rs->xbzrle_bytes += bytes_xbzrle;
- rs->bytes_transferred += bytes_xbzrle;
+ xbzrle_counters.pages++;
+ xbzrle_counters.bytes += bytes_xbzrle;
+ ram_counters.transferred += bytes_xbzrle;
return 1;
}
*
* @rs: current RAM state
* @rb: RAMBlock where to search for dirty pages
- * @start: starting address (typically so we can continue from previous page)
- * @ram_addr_abs: pointer into which to store the address of the dirty page
- * within the global ram_addr space
+ * @start: page where we start the search
*/
static inline
-ram_addr_t migration_bitmap_find_dirty(RAMState *rs, RAMBlock *rb,
- ram_addr_t start,
- ram_addr_t *ram_addr_abs)
+unsigned long migration_bitmap_find_dirty(RAMState *rs, RAMBlock *rb,
+ unsigned long start)
{
- unsigned long base = rb->offset >> TARGET_PAGE_BITS;
- unsigned long nr = base + (start >> TARGET_PAGE_BITS);
- uint64_t rb_size = rb->used_length;
- unsigned long size = base + (rb_size >> TARGET_PAGE_BITS);
- unsigned long *bitmap;
-
+ unsigned long size = rb->used_length >> TARGET_PAGE_BITS;
+ unsigned long *bitmap = rb->bmap;
unsigned long next;
- bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
- if (rs->ram_bulk_stage && nr > base) {
- next = nr + 1;
+ if (rs->ram_bulk_stage && start > 0) {
+ next = start + 1;
} else {
- next = find_next_bit(bitmap, size, nr);
+ next = find_next_bit(bitmap, size, start);
}
- *ram_addr_abs = next << TARGET_PAGE_BITS;
- return (next - base) << TARGET_PAGE_BITS;
+ return next;
}
-static inline bool migration_bitmap_clear_dirty(RAMState *rs, ram_addr_t addr)
+static inline bool migration_bitmap_clear_dirty(RAMState *rs,
+ RAMBlock *rb,
+ unsigned long page)
{
bool ret;
- int nr = addr >> TARGET_PAGE_BITS;
- unsigned long *bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
- ret = test_and_clear_bit(nr, bitmap);
+ ret = test_and_clear_bit(page, rb->bmap);
if (ret) {
rs->migration_dirty_pages--;
return ret;
}
-static void migration_bitmap_sync_range(RAMState *rs, ram_addr_t start,
- ram_addr_t length)
+static void migration_bitmap_sync_range(RAMState *rs, RAMBlock *rb,
+ ram_addr_t start, ram_addr_t length)
{
- unsigned long *bitmap;
- bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
rs->migration_dirty_pages +=
- cpu_physical_memory_sync_dirty_bitmap(bitmap, start, length,
+ cpu_physical_memory_sync_dirty_bitmap(rb, start, length,
&rs->num_dirty_pages_period);
}
RAMBlock *block;
uint64_t summary = 0;
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ RAMBLOCK_FOREACH(block) {
summary |= block->page_size;
}
int64_t end_time;
uint64_t bytes_xfer_now;
- rs->bitmap_sync_count++;
-
- if (!rs->bytes_xfer_prev) {
- rs->bytes_xfer_prev = ram_bytes_transferred();
- }
+ ram_counters.dirty_sync_count++;
if (!rs->time_last_bitmap_sync) {
rs->time_last_bitmap_sync = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
qemu_mutex_lock(&rs->bitmap_mutex);
rcu_read_lock();
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
- migration_bitmap_sync_range(rs, block->offset, block->used_length);
+ RAMBLOCK_FOREACH(block) {
+ migration_bitmap_sync_range(rs, block, 0, block->used_length);
}
rcu_read_unlock();
qemu_mutex_unlock(&rs->bitmap_mutex);
/* more than 1 second = 1000 millisecons */
if (end_time > rs->time_last_bitmap_sync + 1000) {
+ /* calculate period counters */
+ ram_counters.dirty_pages_rate = rs->num_dirty_pages_period * 1000
+ / (end_time - rs->time_last_bitmap_sync);
+ bytes_xfer_now = ram_counters.transferred;
+
if (migrate_auto_converge()) {
/* The following detection logic can be refined later. For now:
Check to see if the dirtied bytes is 50% more than the approx.
amount of bytes that just got transferred since the last time we
were in this routine. If that happens twice, start or increase
throttling */
- bytes_xfer_now = ram_bytes_transferred();
- if (rs->dirty_pages_rate &&
- (rs->num_dirty_pages_period * TARGET_PAGE_SIZE >
+ if ((rs->num_dirty_pages_period * TARGET_PAGE_SIZE >
(bytes_xfer_now - rs->bytes_xfer_prev) / 2) &&
- (rs->dirty_rate_high_cnt++ >= 2)) {
+ (++rs->dirty_rate_high_cnt >= 2)) {
trace_migration_throttle();
rs->dirty_rate_high_cnt = 0;
mig_throttle_guest_down();
- }
- rs->bytes_xfer_prev = bytes_xfer_now;
+ }
}
if (migrate_use_xbzrle()) {
if (rs->iterations_prev != rs->iterations) {
- rs->xbzrle_cache_miss_rate =
- (double)(rs->xbzrle_cache_miss -
+ xbzrle_counters.cache_miss_rate =
+ (double)(xbzrle_counters.cache_miss -
rs->xbzrle_cache_miss_prev) /
(rs->iterations - rs->iterations_prev);
}
rs->iterations_prev = rs->iterations;
- rs->xbzrle_cache_miss_prev = rs->xbzrle_cache_miss;
+ rs->xbzrle_cache_miss_prev = xbzrle_counters.cache_miss;
}
- rs->dirty_pages_rate = rs->num_dirty_pages_period * 1000
- / (end_time - rs->time_last_bitmap_sync);
+
+ /* reset period counters */
rs->time_last_bitmap_sync = end_time;
rs->num_dirty_pages_period = 0;
+ rs->bytes_xfer_prev = bytes_xfer_now;
}
if (migrate_use_events()) {
- qapi_event_send_migration_pass(rs->bitmap_sync_count, NULL);
+ qapi_event_send_migration_pass(ram_counters.dirty_sync_count, NULL);
}
}
int pages = -1;
if (is_zero_range(p, TARGET_PAGE_SIZE)) {
- rs->zero_pages++;
- rs->bytes_transferred +=
- save_page_header(rs->f, block, offset | RAM_SAVE_FLAG_COMPRESS);
+ ram_counters.duplicate++;
+ ram_counters.transferred +=
+ save_page_header(rs, rs->f, block, offset | RAM_SAVE_FLAG_ZERO);
qemu_put_byte(rs->f, 0);
- rs->bytes_transferred += 1;
+ ram_counters.transferred += 1;
pages = 1;
}
return pages;
}
-static void ram_release_pages(MigrationState *ms, const char *rbname,
- uint64_t offset, int pages)
+static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
{
- if (!migrate_release_ram() || !migration_in_postcopy(ms)) {
+ if (!migrate_release_ram() || !migration_in_postcopy()) {
return;
}
- ram_discard_range(NULL, rbname, offset, pages << TARGET_PAGE_BITS);
+ ram_discard_range(rbname, offset, pages << TARGET_PAGE_BITS);
}
/**
* if xbzrle noticed the page was the same.
*
* @rs: current RAM state
- * @ms: current migration state
* @block: block that contains the page we want to send
* @offset: offset inside the block for the page
* @last_stage: if we are at the completion stage
*/
-static int ram_save_page(RAMState *rs, MigrationState *ms,
- PageSearchStatus *pss, bool last_stage)
+static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage)
{
int pages = -1;
uint64_t bytes_xmit;
int ret;
bool send_async = true;
RAMBlock *block = pss->block;
- ram_addr_t offset = pss->offset;
+ ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
p = block->host + offset;
+ trace_ram_save_page(block->idstr, (uint64_t)offset, p);
/* In doubt sent page as normal */
bytes_xmit = 0;
ret = ram_control_save_page(rs->f, block->offset,
offset, TARGET_PAGE_SIZE, &bytes_xmit);
if (bytes_xmit) {
- rs->bytes_transferred += bytes_xmit;
+ ram_counters.transferred += bytes_xmit;
pages = 1;
}
current_addr = block->offset + offset;
- if (block == rs->last_sent_block) {
- offset |= RAM_SAVE_FLAG_CONTINUE;
- }
if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
if (ret != RAM_SAVE_CONTROL_DELAYED) {
if (bytes_xmit > 0) {
- rs->norm_pages++;
+ ram_counters.normal++;
} else if (bytes_xmit == 0) {
- rs->zero_pages++;
+ ram_counters.duplicate++;
}
}
} else {
* page would be stale
*/
xbzrle_cache_zero_page(rs, current_addr);
- ram_release_pages(ms, block->idstr, pss->offset, pages);
+ ram_release_pages(block->idstr, offset, pages);
} else if (!rs->ram_bulk_stage &&
- !migration_in_postcopy(ms) && migrate_use_xbzrle()) {
+ !migration_in_postcopy() && migrate_use_xbzrle()) {
pages = save_xbzrle_page(rs, &p, current_addr, block,
offset, last_stage);
if (!last_stage) {
/* XBZRLE overflow or normal page */
if (pages == -1) {
- rs->bytes_transferred += save_page_header(rs->f, block,
- offset | RAM_SAVE_FLAG_PAGE);
+ ram_counters.transferred +=
+ save_page_header(rs, rs->f, block, offset | RAM_SAVE_FLAG_PAGE);
if (send_async) {
qemu_put_buffer_async(rs->f, p, TARGET_PAGE_SIZE,
migrate_release_ram() &
- migration_in_postcopy(ms));
+ migration_in_postcopy());
} else {
qemu_put_buffer(rs->f, p, TARGET_PAGE_SIZE);
}
- rs->bytes_transferred += TARGET_PAGE_SIZE;
+ ram_counters.transferred += TARGET_PAGE_SIZE;
pages = 1;
- rs->norm_pages++;
+ ram_counters.normal++;
}
XBZRLE_cache_unlock();
static int do_compress_ram_page(QEMUFile *f, RAMBlock *block,
ram_addr_t offset)
{
+ RAMState *rs = ram_state;
int bytes_sent, blen;
uint8_t *p = block->host + (offset & TARGET_PAGE_MASK);
- bytes_sent = save_page_header(f, block, offset |
+ bytes_sent = save_page_header(rs, f, block, offset |
RAM_SAVE_FLAG_COMPRESS_PAGE);
blen = qemu_put_compression_data(f, p, TARGET_PAGE_SIZE,
migrate_compress_level());
error_report("compressed data failed!");
} else {
bytes_sent += blen;
- ram_release_pages(migrate_get_current(), block->idstr,
- offset & TARGET_PAGE_MASK, 1);
+ ram_release_pages(block->idstr, offset & TARGET_PAGE_MASK, 1);
}
return bytes_sent;
qemu_mutex_lock(&comp_param[idx].mutex);
if (!comp_param[idx].quit) {
len = qemu_put_qemu_file(rs->f, comp_param[idx].file);
- rs->bytes_transferred += len;
+ ram_counters.transferred += len;
}
qemu_mutex_unlock(&comp_param[idx].mutex);
}
qemu_cond_signal(&comp_param[idx].cond);
qemu_mutex_unlock(&comp_param[idx].mutex);
pages = 1;
- rs->norm_pages++;
- rs->bytes_transferred += bytes_xmit;
+ ram_counters.normal++;
+ ram_counters.transferred += bytes_xmit;
break;
}
}
* Returns the number of pages written.
*
* @rs: current RAM state
- * @ms: current migration state
* @block: block that contains the page we want to send
* @offset: offset inside the block for the page
* @last_stage: if we are at the completion stage
*/
-static int ram_save_compressed_page(RAMState *rs, MigrationState *ms,
- PageSearchStatus *pss, bool last_stage)
+static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss,
+ bool last_stage)
{
int pages = -1;
uint64_t bytes_xmit = 0;
uint8_t *p;
int ret, blen;
RAMBlock *block = pss->block;
- ram_addr_t offset = pss->offset;
+ ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
p = block->host + offset;
ret = ram_control_save_page(rs->f, block->offset,
offset, TARGET_PAGE_SIZE, &bytes_xmit);
if (bytes_xmit) {
- rs->bytes_transferred += bytes_xmit;
+ ram_counters.transferred += bytes_xmit;
pages = 1;
}
if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
if (ret != RAM_SAVE_CONTROL_DELAYED) {
if (bytes_xmit > 0) {
- rs->norm_pages++;
+ ram_counters.normal++;
} else if (bytes_xmit == 0) {
- rs->zero_pages++;
+ ram_counters.duplicate++;
}
}
} else {
pages = save_zero_page(rs, block, offset, p);
if (pages == -1) {
/* Make sure the first page is sent out before other pages */
- bytes_xmit = save_page_header(rs->f, block, offset |
+ bytes_xmit = save_page_header(rs, rs->f, block, offset |
RAM_SAVE_FLAG_COMPRESS_PAGE);
blen = qemu_put_compression_data(rs->f, p, TARGET_PAGE_SIZE,
migrate_compress_level());
if (blen > 0) {
- rs->bytes_transferred += bytes_xmit + blen;
- rs->norm_pages++;
+ ram_counters.transferred += bytes_xmit + blen;
+ ram_counters.normal++;
pages = 1;
} else {
qemu_file_set_error(rs->f, blen);
}
}
if (pages > 0) {
- ram_release_pages(ms, block->idstr, pss->offset, pages);
+ ram_release_pages(block->idstr, offset, pages);
}
} else {
- offset |= RAM_SAVE_FLAG_CONTINUE;
pages = save_zero_page(rs, block, offset, p);
if (pages == -1) {
pages = compress_page_with_multi_thread(rs, block, offset);
} else {
- ram_release_pages(ms, block->idstr, pss->offset, pages);
+ ram_release_pages(block->idstr, offset, pages);
}
}
}
* @rs: current RAM state
* @pss: data about the state of the current dirty page scan
* @again: set to false if the search has scanned the whole of RAM
- * @ram_addr_abs: pointer into which to store the address of the dirty page
- * within the global ram_addr space
*/
-static bool find_dirty_block(RAMState *rs, PageSearchStatus *pss,
- bool *again, ram_addr_t *ram_addr_abs)
+static bool find_dirty_block(RAMState *rs, PageSearchStatus *pss, bool *again)
{
- pss->offset = migration_bitmap_find_dirty(rs, pss->block, pss->offset,
- ram_addr_abs);
+ pss->page = migration_bitmap_find_dirty(rs, pss->block, pss->page);
if (pss->complete_round && pss->block == rs->last_seen_block &&
- pss->offset >= rs->last_offset) {
+ pss->page >= rs->last_page) {
/*
* We've been once around the RAM and haven't found anything.
* Give up.
*again = false;
return false;
}
- if (pss->offset >= pss->block->used_length) {
+ if ((pss->page << TARGET_PAGE_BITS) >= pss->block->used_length) {
/* Didn't find anything in this RAM Block */
- pss->offset = 0;
+ pss->page = 0;
pss->block = QLIST_NEXT_RCU(pss->block, next);
if (!pss->block) {
/* Hit the end of the list */
* point. In theory, xbzrle can do better than compression.
*/
flush_compressed_data(rs);
- compression_switch = false;
}
}
/* Didn't find anything this time, but try again on the new block */
*
* @rs: current RAM state
* @offset: used to return the offset within the RAMBlock
- * @ram_addr_abs: pointer into which to store the address of the dirty page
- * within the global ram_addr space
*/
-static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset,
- ram_addr_t *ram_addr_abs)
+static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset)
{
RAMBlock *block = NULL;
QSIMPLEQ_FIRST(&rs->src_page_requests);
block = entry->rb;
*offset = entry->offset;
- *ram_addr_abs = (entry->offset + entry->rb->offset) &
- TARGET_PAGE_MASK;
if (entry->len > TARGET_PAGE_SIZE) {
entry->len -= TARGET_PAGE_SIZE;
*
* @rs: current RAM state
* @pss: data about the state of the current dirty page scan
- * @ram_addr_abs: pointer into which to store the address of the dirty page
- * within the global ram_addr space
*/
-static bool get_queued_page(RAMState *rs, PageSearchStatus *pss,
- ram_addr_t *ram_addr_abs)
+static bool get_queued_page(RAMState *rs, PageSearchStatus *pss)
{
RAMBlock *block;
ram_addr_t offset;
bool dirty;
do {
- block = unqueue_page(rs, &offset, ram_addr_abs);
+ block = unqueue_page(rs, &offset);
/*
* We're sending this page, and since it's postcopy nothing else
* will dirty it, and we must make sure it doesn't get sent again
* search already sent it.
*/
if (block) {
- unsigned long *bitmap;
- bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
- dirty = test_bit(*ram_addr_abs >> TARGET_PAGE_BITS, bitmap);
+ unsigned long page;
+
+ page = offset >> TARGET_PAGE_BITS;
+ dirty = test_bit(page, block->bmap);
if (!dirty) {
- trace_get_queued_page_not_dirty(
- block->idstr, (uint64_t)offset,
- (uint64_t)*ram_addr_abs,
- test_bit(*ram_addr_abs >> TARGET_PAGE_BITS,
- atomic_rcu_read(&rs->ram_bitmap)->unsentmap));
+ trace_get_queued_page_not_dirty(block->idstr, (uint64_t)offset,
+ page, test_bit(page, block->unsentmap));
} else {
- trace_get_queued_page(block->idstr,
- (uint64_t)offset,
- (uint64_t)*ram_addr_abs);
+ trace_get_queued_page(block->idstr, (uint64_t)offset, page);
}
}
* it just requested.
*/
pss->block = block;
- pss->offset = offset;
+ pss->page = offset >> TARGET_PAGE_BITS;
}
return !!block;
* be some left. in case that there is any page left, we drop it.
*
*/
-void migration_page_queue_free(void)
+static void migration_page_queue_free(RAMState *rs)
{
struct RAMSrcPageRequest *mspr, *next_mspr;
- RAMState *rs = &ram_state;
/* This queue generally should be empty - but in the case of a failed
* migration might have some droppings in.
*/
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;
- rs->postcopy_requests++;
+ ram_counters.postcopy_requests++;
rcu_read_lock();
if (!rbname) {
/* Reuse last RAMBlock */
* @ms: current migration state
* @pss: data about the page we want to send
* @last_stage: if we are at the completion stage
- * @dirty_ram_abs: address of the start of the dirty page in ram_addr_t space
*/
-static int ram_save_target_page(RAMState *rs, MigrationState *ms,
- PageSearchStatus *pss,
- bool last_stage,
- ram_addr_t dirty_ram_abs)
+static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss,
+ bool last_stage)
{
int res = 0;
/* Check the pages is dirty and if it is send it */
- if (migration_bitmap_clear_dirty(rs, dirty_ram_abs)) {
- unsigned long *unsentmap;
- if (compression_switch && migrate_use_compression()) {
- res = ram_save_compressed_page(rs, ms, pss, last_stage);
+ if (migration_bitmap_clear_dirty(rs, pss->block, pss->page)) {
+ /*
+ * If xbzrle is on, stop using the data compression after first
+ * round of migration even if compression is enabled. In theory,
+ * xbzrle can do better than compression.
+ */
+ if (migrate_use_compression() &&
+ (rs->ram_bulk_stage || !migrate_use_xbzrle())) {
+ res = ram_save_compressed_page(rs, pss, last_stage);
} else {
- res = ram_save_page(rs, ms, pss, last_stage);
+ res = ram_save_page(rs, pss, last_stage);
}
if (res < 0) {
return res;
}
- unsentmap = atomic_rcu_read(&rs->ram_bitmap)->unsentmap;
- if (unsentmap) {
- clear_bit(dirty_ram_abs >> TARGET_PAGE_BITS, unsentmap);
- }
- /* Only update last_sent_block if a block was actually sent; xbzrle
- * might have decided the page was identical so didn't bother writing
- * to the stream.
- */
- if (res > 0) {
- rs->last_sent_block = pss->block;
+ if (pss->block->unsentmap) {
+ clear_bit(pss->page, pss->block->unsentmap);
}
}
* a host page in which case the remainder of the hostpage is sent.
* Only dirty target pages are sent. Note that the host page size may
* be a huge page for this block.
+ * The saving stops at the boundary of the used_length of the block
+ * if the RAMBlock isn't a multiple of the host page size.
*
* Returns the number of pages written or negative on error
*
* @ms: current migration state
* @pss: data about the page we want to send
* @last_stage: if we are at the completion stage
- * @dirty_ram_abs: Address of the start of the dirty page in ram_addr_t space
*/
-static int ram_save_host_page(RAMState *rs, MigrationState *ms,
- PageSearchStatus *pss,
- bool last_stage,
- ram_addr_t dirty_ram_abs)
+static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss,
+ bool last_stage)
{
int tmppages, pages = 0;
- size_t pagesize = qemu_ram_pagesize(pss->block);
+ size_t pagesize_bits =
+ qemu_ram_pagesize(pss->block) >> TARGET_PAGE_BITS;
do {
- tmppages = ram_save_target_page(rs, ms, pss, last_stage, dirty_ram_abs);
+ tmppages = ram_save_target_page(rs, pss, last_stage);
if (tmppages < 0) {
return tmppages;
}
pages += tmppages;
- pss->offset += TARGET_PAGE_SIZE;
- dirty_ram_abs += TARGET_PAGE_SIZE;
- } while (pss->offset & (pagesize - 1));
+ pss->page++;
+ } while ((pss->page & (pagesize_bits - 1)) &&
+ offset_in_ramblock(pss->block, pss->page << TARGET_PAGE_BITS));
/* The offset we leave with is the last one we looked at */
- pss->offset -= TARGET_PAGE_SIZE;
+ pss->page--;
return pages;
}
static int ram_find_and_save_block(RAMState *rs, bool last_stage)
{
PageSearchStatus pss;
- MigrationState *ms = migrate_get_current();
int pages = 0;
bool again, found;
- ram_addr_t dirty_ram_abs; /* Address of the start of the dirty page in
- ram_addr_t space */
/* No dirty page as there is zero RAM */
if (!ram_bytes_total()) {
}
pss.block = rs->last_seen_block;
- pss.offset = rs->last_offset;
+ pss.page = rs->last_page;
pss.complete_round = false;
if (!pss.block) {
do {
again = true;
- found = get_queued_page(rs, &pss, &dirty_ram_abs);
+ found = get_queued_page(rs, &pss);
if (!found) {
/* priority queue empty, so just search for something dirty */
- found = find_dirty_block(rs, &pss, &again, &dirty_ram_abs);
+ found = find_dirty_block(rs, &pss, &again);
}
if (found) {
- pages = ram_save_host_page(rs, ms, &pss, last_stage, dirty_ram_abs);
+ pages = ram_save_host_page(rs, &pss, last_stage);
}
} while (!pages && again);
rs->last_seen_block = pss.block;
- rs->last_offset = pss.offset;
+ rs->last_page = pss.page;
return pages;
}
void acct_update_position(QEMUFile *f, size_t size, bool zero)
{
uint64_t pages = size / TARGET_PAGE_SIZE;
- RAMState *rs = &ram_state;
if (zero) {
- rs->zero_pages += pages;
+ ram_counters.duplicate += pages;
} else {
- rs->norm_pages += pages;
- rs->bytes_transferred += size;
+ ram_counters.normal += pages;
+ ram_counters.transferred += size;
qemu_update_position(f, size);
}
}
uint64_t total = 0;
rcu_read_lock();
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next)
+ RAMBLOCK_FOREACH(block) {
total += block->used_length;
+ }
rcu_read_unlock();
return total;
}
-void free_xbzrle_decoded_buf(void)
+static void xbzrle_load_setup(void)
{
- g_free(xbzrle_decoded_buf);
- xbzrle_decoded_buf = NULL;
+ XBZRLE.decoded_buf = g_malloc(TARGET_PAGE_SIZE);
}
-static void migration_bitmap_free(struct RAMBitmap *bmap)
+static void xbzrle_load_cleanup(void)
{
- g_free(bmap->bmap);
- g_free(bmap->unsentmap);
- g_free(bmap);
+ g_free(XBZRLE.decoded_buf);
+ XBZRLE.decoded_buf = NULL;
}
-static void ram_migration_cleanup(void *opaque)
+static void ram_save_cleanup(void *opaque)
{
- RAMState *rs = opaque;
+ RAMState **rsp = opaque;
+ RAMBlock *block;
/* caller have hold iothread lock or is in a bh, so there is
* no writing race against this migration_bitmap
*/
- struct RAMBitmap *bitmap = rs->ram_bitmap;
- atomic_rcu_set(&rs->ram_bitmap, NULL);
- if (bitmap) {
- memory_global_dirty_log_stop();
- call_rcu(bitmap, migration_bitmap_free, rcu);
+ memory_global_dirty_log_stop();
+
+ QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ g_free(block->bmap);
+ block->bmap = NULL;
+ g_free(block->unsentmap);
+ block->unsentmap = NULL;
}
XBZRLE_cache_lock();
cache_fini(XBZRLE.cache);
g_free(XBZRLE.encoded_buf);
g_free(XBZRLE.current_buf);
- g_free(ZERO_TARGET_PAGE);
+ g_free(XBZRLE.zero_target_page);
XBZRLE.cache = NULL;
XBZRLE.encoded_buf = NULL;
XBZRLE.current_buf = NULL;
+ XBZRLE.zero_target_page = NULL;
}
XBZRLE_cache_unlock();
+ migration_page_queue_free(*rsp);
+ compress_threads_save_cleanup();
+ g_free(*rsp);
+ *rsp = NULL;
}
static void ram_state_reset(RAMState *rs)
{
rs->last_seen_block = NULL;
rs->last_sent_block = NULL;
- rs->last_offset = 0;
+ rs->last_page = 0;
rs->last_version = ram_list.version;
rs->ram_bulk_stage = true;
}
#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) {
- struct RAMBitmap *old_bitmap = rs->ram_bitmap, *bitmap;
- bitmap = g_new(struct 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.
* If 'todump' is null the migration bitmap is dumped.
*/
-void ram_debug_dump_bitmap(unsigned long *todump, bool expected)
+void ram_debug_dump_bitmap(unsigned long *todump, bool expected,
+ unsigned long pages)
{
- int64_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS;
- RAMState *rs = &ram_state;
int64_t cur;
int64_t linelen = 128;
char linebuf[129];
- if (!todump) {
- todump = atomic_rcu_read(&rs->ram_bitmap)->bmap;
- }
-
- for (cur = 0; cur < ram_pages; cur += linelen) {
+ for (cur = 0; cur < pages; cur += linelen) {
int64_t curb;
bool found = false;
/*
* Last line; catch the case where the line length
* is longer than remaining ram
*/
- if (cur + linelen > ram_pages) {
- linelen = ram_pages - cur;
+ if (cur + linelen > pages) {
+ linelen = pages - cur;
}
for (curb = 0; curb < linelen; curb++) {
bool thisbit = test_bit(cur + curb, todump);
void ram_postcopy_migrated_memory_release(MigrationState *ms)
{
- RAMState *rs = &ram_state;
struct RAMBlock *block;
- unsigned long *bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
- unsigned long first = block->offset >> TARGET_PAGE_BITS;
- unsigned long range = first + (block->used_length >> TARGET_PAGE_BITS);
- unsigned long run_start = find_next_zero_bit(bitmap, range, first);
+ RAMBLOCK_FOREACH(block) {
+ unsigned long *bitmap = block->bmap;
+ unsigned long range = block->used_length >> TARGET_PAGE_BITS;
+ unsigned long run_start = find_next_zero_bit(bitmap, range, 0);
while (run_start < range) {
unsigned long run_end = find_next_bit(bitmap, range, run_start + 1);
- ram_discard_range(NULL, block->idstr, run_start << TARGET_PAGE_BITS,
+ ram_discard_range(block->idstr, run_start << TARGET_PAGE_BITS,
(run_end - run_start) << TARGET_PAGE_BITS);
run_start = find_next_zero_bit(bitmap, range, run_end + 1);
}
*/
static int postcopy_send_discard_bm_ram(MigrationState *ms,
PostcopyDiscardState *pds,
- unsigned long start,
- unsigned long length)
+ RAMBlock *block)
{
- RAMState *rs = &ram_state;
- unsigned long end = start + length; /* one after the end */
+ unsigned long end = block->used_length >> TARGET_PAGE_BITS;
unsigned long current;
- unsigned long *unsentmap;
+ unsigned long *unsentmap = block->unsentmap;
- unsentmap = atomic_rcu_read(&rs->ram_bitmap)->unsentmap;
- for (current = start; current < end; ) {
+ for (current = 0; current < end; ) {
unsigned long one = find_next_bit(unsentmap, end, current);
if (one <= end) {
struct RAMBlock *block;
int ret;
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
- unsigned long first = block->offset >> TARGET_PAGE_BITS;
- PostcopyDiscardState *pds = postcopy_discard_send_init(ms,
- first,
- block->idstr);
+ RAMBLOCK_FOREACH(block) {
+ PostcopyDiscardState *pds =
+ postcopy_discard_send_init(ms, block->idstr);
/*
* Postcopy sends chunks of bitmap over the wire, but it
* just needs indexes at this point, avoids it having
* target page specific code.
*/
- ret = postcopy_send_discard_bm_ram(ms, pds, first,
- block->used_length >> TARGET_PAGE_BITS);
+ ret = postcopy_send_discard_bm_ram(ms, pds, block);
postcopy_discard_send_finish(ms, pds);
if (ret) {
return ret;
RAMBlock *block,
PostcopyDiscardState *pds)
{
- RAMState *rs = &ram_state;
- unsigned long *bitmap;
- unsigned long *unsentmap;
+ RAMState *rs = ram_state;
+ unsigned long *bitmap = block->bmap;
+ unsigned long *unsentmap = block->unsentmap;
unsigned int host_ratio = block->page_size / TARGET_PAGE_SIZE;
- unsigned long first = block->offset >> TARGET_PAGE_BITS;
- unsigned long len = block->used_length >> TARGET_PAGE_BITS;
- unsigned long last = first + (len - 1);
+ unsigned long pages = block->used_length >> TARGET_PAGE_BITS;
unsigned long run_start;
if (block->page_size == TARGET_PAGE_SIZE) {
return;
}
- bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
- unsentmap = atomic_rcu_read(&rs->ram_bitmap)->unsentmap;
-
if (unsent_pass) {
/* Find a sent page */
- run_start = find_next_zero_bit(unsentmap, last + 1, first);
+ run_start = find_next_zero_bit(unsentmap, pages, 0);
} else {
/* Find a dirty page */
- run_start = find_next_bit(bitmap, last + 1, first);
+ run_start = find_next_bit(bitmap, pages, 0);
}
- while (run_start <= last) {
+ while (run_start < pages) {
bool do_fixup = false;
unsigned long fixup_start_addr;
unsigned long host_offset;
/* Find the end of this run */
unsigned long run_end;
if (unsent_pass) {
- run_end = find_next_bit(unsentmap, last + 1, run_start + 1);
+ run_end = find_next_bit(unsentmap, pages, run_start + 1);
} else {
- run_end = find_next_zero_bit(bitmap, last + 1, run_start + 1);
+ run_end = find_next_zero_bit(bitmap, pages, run_start + 1);
}
/*
* If the end isn't at the start of a host page, then the
if (unsent_pass) {
/* Find the next sent page for the next iteration */
- run_start = find_next_zero_bit(unsentmap, last + 1,
- run_start);
+ run_start = find_next_zero_bit(unsentmap, pages, run_start);
} else {
/* Find the next dirty page for the next iteration */
- run_start = find_next_bit(bitmap, last + 1, run_start);
+ run_start = find_next_bit(bitmap, pages, run_start);
}
}
}
* Returns zero on success
*
* @ms: current migration state
+ * @block: block we want to work with
*/
-static int postcopy_chunk_hostpages(MigrationState *ms)
+static int postcopy_chunk_hostpages(MigrationState *ms, RAMBlock *block)
{
- RAMState *rs = &ram_state;
- struct RAMBlock *block;
+ PostcopyDiscardState *pds =
+ postcopy_discard_send_init(ms, block->idstr);
- /* Easiest way to make sure we don't resume in the middle of a host-page */
- rs->last_seen_block = NULL;
- rs->last_sent_block = NULL;
- rs->last_offset = 0;
-
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
- unsigned long first = block->offset >> TARGET_PAGE_BITS;
-
- PostcopyDiscardState *pds =
- postcopy_discard_send_init(ms, first, block->idstr);
-
- /* First pass: Discard all partially sent host pages */
- postcopy_chunk_hostpages_pass(ms, true, block, pds);
- /*
- * Second pass: Ensure that all partially dirty host pages are made
- * fully dirty.
- */
- postcopy_chunk_hostpages_pass(ms, false, block, pds);
-
- postcopy_discard_send_finish(ms, pds);
- } /* ram_list loop */
+ /* First pass: Discard all partially sent host pages */
+ postcopy_chunk_hostpages_pass(ms, true, block, pds);
+ /*
+ * Second pass: Ensure that all partially dirty host pages are made
+ * fully dirty.
+ */
+ postcopy_chunk_hostpages_pass(ms, false, block, pds);
+ postcopy_discard_send_finish(ms, pds);
return 0;
}
*/
int ram_postcopy_send_discard_bitmap(MigrationState *ms)
{
- RAMState *rs = &ram_state;
+ RAMState *rs = ram_state;
+ RAMBlock *block;
int ret;
- unsigned long *bitmap, *unsentmap;
rcu_read_lock();
/* This should be our last sync, the src is now paused */
migration_bitmap_sync(rs);
- unsentmap = atomic_rcu_read(&rs->ram_bitmap)->unsentmap;
- if (!unsentmap) {
- /* We don't have a safe way to resize the sentmap, so
- * if the bitmap was resized it will be NULL at this
- * point.
- */
- error_report("migration ram resized during precopy phase");
- rcu_read_unlock();
- return -EINVAL;
- }
-
- /* Deal with TPS != HPS and huge pages */
- ret = postcopy_chunk_hostpages(ms);
- if (ret) {
- rcu_read_unlock();
- return ret;
- }
-
- /*
- * Update the unsentmap to be unsentmap = unsentmap | dirty
- */
- bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
- bitmap_or(unsentmap, unsentmap, bitmap,
- last_ram_offset() >> TARGET_PAGE_BITS);
+ /* Easiest way to make sure we don't resume in the middle of a host-page */
+ rs->last_seen_block = NULL;
+ rs->last_sent_block = NULL;
+ rs->last_page = 0;
+ QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ unsigned long pages = block->used_length >> TARGET_PAGE_BITS;
+ unsigned long *bitmap = block->bmap;
+ unsigned long *unsentmap = block->unsentmap;
+
+ if (!unsentmap) {
+ /* We don't have a safe way to resize the sentmap, so
+ * if the bitmap was resized it will be NULL at this
+ * point.
+ */
+ error_report("migration ram resized during precopy phase");
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+ /* Deal with TPS != HPS and huge pages */
+ ret = postcopy_chunk_hostpages(ms, block);
+ if (ret) {
+ rcu_read_unlock();
+ return ret;
+ }
- trace_ram_postcopy_send_discard_bitmap();
+ /*
+ * Update the unsentmap to be unsentmap = unsentmap | dirty
+ */
+ bitmap_or(unsentmap, unsentmap, bitmap, pages);
#ifdef DEBUG_POSTCOPY
- ram_debug_dump_bitmap(unsentmap, true);
+ ram_debug_dump_bitmap(unsentmap, true, pages);
#endif
+ }
+ trace_ram_postcopy_send_discard_bitmap();
ret = postcopy_each_ram_send_discard(ms);
rcu_read_unlock();
*
* Returns zero on success
*
- * @mis: current migration incoming state
* @rbname: name of the RAMBlock of the request. NULL means the
* same that last one.
* @start: RAMBlock starting page
* @length: RAMBlock size
*/
-int ram_discard_range(MigrationIncomingState *mis,
- const char *rbname,
- uint64_t start, size_t length)
+int ram_discard_range(const char *rbname, uint64_t start, size_t length)
{
int ret = -1;
return ret;
}
-static int ram_state_init(RAMState *rs)
+static int ram_state_init(RAMState **rsp)
{
- int64_t ram_bitmap_pages; /* Size of bitmap in pages, including gaps */
+ *rsp = g_new0(RAMState, 1);
- 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);
+ 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();
- ZERO_TARGET_PAGE = g_malloc0(TARGET_PAGE_SIZE);
+ XBZRLE.zero_target_page = g_malloc0(TARGET_PAGE_SIZE);
XBZRLE.cache = cache_init(migrate_xbzrle_cache_size() /
TARGET_PAGE_SIZE,
TARGET_PAGE_SIZE);
if (!XBZRLE.cache) {
XBZRLE_cache_unlock();
error_report("Error creating cache");
+ g_free(*rsp);
+ *rsp = NULL;
return -1;
}
XBZRLE_cache_unlock();
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;
}
error_report("Error allocating current_buf");
g_free(XBZRLE.encoded_buf);
XBZRLE.encoded_buf = NULL;
+ g_free(*rsp);
+ *rsp = NULL;
return -1;
}
}
qemu_mutex_lock_ramlist();
rcu_read_lock();
- ram_state_reset(rs);
+ ram_state_reset(*rsp);
- rs->ram_bitmap = g_new0(struct RAMBitmap, 1);
/* Skip setting bitmap if there is no RAM */
if (ram_bytes_total()) {
- ram_bitmap_pages = last_ram_offset() >> TARGET_PAGE_BITS;
- rs->ram_bitmap->bmap = bitmap_new(ram_bitmap_pages);
- bitmap_set(rs->ram_bitmap->bmap, 0, ram_bitmap_pages);
+ RAMBlock *block;
+
+ QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ unsigned long pages = block->max_length >> TARGET_PAGE_BITS;
- if (migrate_postcopy_ram()) {
- rs->ram_bitmap->unsentmap = bitmap_new(ram_bitmap_pages);
- bitmap_set(rs->ram_bitmap->unsentmap, 0, ram_bitmap_pages);
+ block->bmap = bitmap_new(pages);
+ bitmap_set(block->bmap, 0, pages);
+ if (migrate_postcopy_ram()) {
+ block->unsentmap = bitmap_new(pages);
+ bitmap_set(block->unsentmap, 0, pages);
+ }
}
}
* 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();
*/
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();
qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ RAMBLOCK_FOREACH(block) {
qemu_put_byte(f, strlen(block->idstr));
qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
qemu_put_be64(f, block->used_length);
}
rcu_read_unlock();
+ compress_threads_save_setup();
ram_control_before_iterate(f, RAM_CONTROL_SETUP);
ram_control_after_iterate(f, RAM_CONTROL_SETUP);
*/
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;
ram_control_after_iterate(f, RAM_CONTROL_ROUND);
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
- rs->bytes_transferred += 8;
+ ram_counters.transferred += 8;
ret = qemu_file_get_error(f);
if (ret < 0) {
*/
static int ram_save_complete(QEMUFile *f, void *opaque)
{
- RAMState *rs = opaque;
+ RAMState **temp = opaque;
+ RAMState *rs = *temp;
rcu_read_lock();
- if (!migration_in_postcopy(migrate_get_current())) {
+ if (!migration_in_postcopy()) {
migration_bitmap_sync(rs);
}
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;
- if (!migration_in_postcopy(migrate_get_current()) &&
+ if (!migration_in_postcopy() &&
remaining_size < max_size) {
qemu_mutex_lock_iothread();
rcu_read_lock();
int xh_flags;
uint8_t *loaded_data;
- if (!xbzrle_decoded_buf) {
- xbzrle_decoded_buf = g_malloc(TARGET_PAGE_SIZE);
- }
- loaded_data = xbzrle_decoded_buf;
-
/* extract RLE header */
xh_flags = qemu_get_byte(f);
xh_len = qemu_get_be16(f);
error_report("Failed to load XBZRLE page - len overflow!");
return -1;
}
+ loaded_data = XBZRLE.decoded_buf;
/* load data and decode */
+ /* it can change loaded_data to point to an internal buffer */
qemu_get_buffer_in_place(f, &loaded_data, xh_len);
/* decode RLE */
qemu_mutex_unlock(&decomp_done_lock);
}
-void migrate_decompress_threads_create(void)
+static void compress_threads_load_setup(void)
{
int i, thread_count;
+ if (!migrate_use_compression()) {
+ return;
+ }
thread_count = migrate_decompress_threads();
decompress_threads = g_new0(QemuThread, thread_count);
decomp_param = g_new0(DecompressParam, thread_count);
}
}
-void migrate_decompress_threads_join(void)
+static void compress_threads_load_cleanup(void)
{
int i, thread_count;
+ if (!migrate_use_compression()) {
+ return;
+ }
thread_count = migrate_decompress_threads();
for (i = 0; i < thread_count; i++) {
qemu_mutex_lock(&decomp_param[i].mutex);
qemu_mutex_unlock(&decomp_done_lock);
}
+/**
+ * ram_load_setup: Setup RAM for migration incoming side
+ *
+ * Returns zero to indicate success and negative for error
+ *
+ * @f: QEMUFile where to receive the data
+ * @opaque: RAMState pointer
+ */
+static int ram_load_setup(QEMUFile *f, void *opaque)
+{
+ xbzrle_load_setup();
+ compress_threads_load_setup();
+ return 0;
+}
+
+static int ram_load_cleanup(void *opaque)
+{
+ xbzrle_load_cleanup();
+ compress_threads_load_cleanup();
+ return 0;
+}
+
/**
* ram_postcopy_incoming_init: allocate postcopy data structures
*
*/
int ram_postcopy_incoming_init(MigrationIncomingState *mis)
{
- size_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS;
+ unsigned long ram_pages = last_ram_page();
return postcopy_ram_incoming_init(mis, ram_pages);
}
trace_ram_load_postcopy_loop((uint64_t)addr, flags);
place_needed = false;
- if (flags & (RAM_SAVE_FLAG_COMPRESS | RAM_SAVE_FLAG_PAGE)) {
+ if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE)) {
block = ram_block_from_stream(f, flags);
host = host_from_ram_block_offset(block, addr);
last_host = host;
switch (flags & ~RAM_SAVE_FLAG_CONTINUE) {
- case RAM_SAVE_FLAG_COMPRESS:
+ case RAM_SAVE_FLAG_ZERO:
ch = qemu_get_byte(f);
memset(page_buffer, ch, TARGET_PAGE_SIZE);
if (ch) {
static int ram_load(QEMUFile *f, void *opaque, int version_id)
{
- int flags = 0, ret = 0;
+ int flags = 0, ret = 0, invalid_flags = 0;
static uint64_t seq_iter;
int len = 0;
/*
ret = -EINVAL;
}
+ if (!migrate_use_compression()) {
+ invalid_flags |= RAM_SAVE_FLAG_COMPRESS_PAGE;
+ }
/* This RCU critical section can be very long running.
* When RCU reclaims in the code start to become numerous,
* it will be necessary to reduce the granularity of this
flags = addr & ~TARGET_PAGE_MASK;
addr &= TARGET_PAGE_MASK;
- if (flags & (RAM_SAVE_FLAG_COMPRESS | RAM_SAVE_FLAG_PAGE |
+ if (flags & invalid_flags) {
+ if (flags & invalid_flags & RAM_SAVE_FLAG_COMPRESS_PAGE) {
+ error_report("Received an unexpected compressed page");
+ }
+
+ ret = -EINVAL;
+ break;
+ }
+
+ if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE |
RAM_SAVE_FLAG_COMPRESS_PAGE | RAM_SAVE_FLAG_XBZRLE)) {
RAMBlock *block = ram_block_from_stream(f, flags);
ret = -EINVAL;
break;
}
+ trace_ram_load_loop(block->idstr, (uint64_t)addr, flags, host);
}
switch (flags & ~RAM_SAVE_FLAG_CONTINUE) {
}
break;
- case RAM_SAVE_FLAG_COMPRESS:
+ case RAM_SAVE_FLAG_ZERO:
ch = qemu_get_byte(f);
ram_handle_compressed(host, ch, TARGET_PAGE_SIZE);
break;
}
static SaveVMHandlers savevm_ram_handlers = {
- .save_live_setup = ram_save_setup,
+ .save_setup = ram_save_setup,
.save_live_iterate = ram_save_iterate,
.save_live_complete_postcopy = ram_save_complete,
.save_live_complete_precopy = ram_save_complete,
.save_live_pending = ram_save_pending,
.load_state = ram_load,
- .cleanup = ram_migration_cleanup,
+ .save_cleanup = ram_save_cleanup,
+ .load_setup = ram_load_setup,
+ .load_cleanup = ram_load_cleanup,
};
void ram_mig_init(void)
projects / qemu.git / blobdiff