The function still don't use multifd, but we have simplified
ram_save_page, xbzrle and RDMA stuff is gone. We have added a new
counter and a new flag for this type of pages.
Signed-off-by: Juan Quintela <quint...@redhat.com>
--
Add last_page parameter
Add commets for done and address
---
hmp.c | 2 ++
migration/migration.c | 1 +
migration/ram.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++-
qapi-schema.json | 5 ++-
4 files changed, 100 insertions(+), 2 deletions(-)
diff --git a/hmp.c b/hmp.c
index a52035a..bc2b071 100644
--- a/hmp.c
+++ b/hmp.c
@@ -234,6 +234,8 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
monitor_printf(mon, "postcopy request count: %" PRIu64 "\n",
info->ram->postcopy_requests);
}
+ monitor_printf(mon, "multifd: %" PRIu64 " pages\n",
+ info->ram->multifd);
}
if (info->has_disk) {
diff --git a/migration/migration.c b/migration/migration.c
index 944d6e2..8e9505a 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -549,6 +549,7 @@ static void populate_ram_info(MigrationInfo *info,
MigrationState *s)
info->ram->dirty_sync_count = ram_counters.dirty_sync_count;
info->ram->postcopy_requests = ram_counters.postcopy_requests;
info->ram->page_size = qemu_target_page_size();
+ info->ram->multifd = ram_counters.multifd;
if (migrate_use_xbzrle()) {
info->has_xbzrle_cache = true;
diff --git a/migration/ram.c b/migration/ram.c
index e9fa556..03f3427 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -68,6 +68,7 @@
#define RAM_SAVE_FLAG_XBZRLE 0x40
/* 0x80 is reserved in migration.h start with 0x100 next */
#define RAM_SAVE_FLAG_COMPRESS_PAGE 0x100
+#define RAM_SAVE_FLAG_MULTIFD_PAGE 0x200
static inline bool is_zero_range(uint8_t *p, uint64_t size)
{
@@ -362,12 +363,22 @@ static void compress_threads_save_setup(void)
/* Multiple fd's */
struct MultiFDSendParams {
+ /* not changed */
uint8_t id;
QemuThread thread;
QIOChannel *c;
QemuSemaphore sem;
QemuMutex mutex;
+ /* protected by param mutex */
bool quit;
+ /* This is a temp field. We are using it now to transmit
+ something the address of the page. Later in the series, we
+ change it for the real page.
+ */
+ uint8_t *address;
+ /* protected by multifd mutex */
+ /* has the thread finish the last submitted job */
+ bool done;
};
typedef struct MultiFDSendParams MultiFDSendParams;
@@ -375,6 +386,8 @@ struct {
MultiFDSendParams *params;
/* number of created threads */
int count;
+ QemuMutex mutex;
+ QemuSemaphore sem;
} *multifd_send_state;
static void terminate_multifd_send_threads(void)
@@ -433,6 +446,7 @@ static void *multifd_send_thread(void *opaque)
g_free(string_uuid);
qio_channel_write(p->c, string, MULTIFD_UUID_MSG, &error_abort);
g_free(string);
+ qemu_sem_post(&multifd_send_state->sem);
while (true) {
qemu_mutex_lock(&p->mutex);
@@ -440,6 +454,15 @@ static void *multifd_send_thread(void *opaque)
qemu_mutex_unlock(&p->mutex);
break;
}
+ if (p->address) {
+ p->address = 0;
+ qemu_mutex_unlock(&p->mutex);
+ qemu_mutex_lock(&multifd_send_state->mutex);
+ p->done = true;
+ qemu_mutex_unlock(&multifd_send_state->mutex);
+ qemu_sem_post(&multifd_send_state->sem);
+ continue;
+ }
qemu_mutex_unlock(&p->mutex);
qemu_sem_wait(&p->sem);
}
@@ -459,6 +482,8 @@ int multifd_save_setup(void)
multifd_send_state = g_malloc0(sizeof(*multifd_send_state));
multifd_send_state->params = g_new0(MultiFDSendParams, thread_count);
multifd_send_state->count = 0;
+ qemu_mutex_init(&multifd_send_state->mutex);
+ qemu_sem_init(&multifd_send_state->sem, 0);
for (i = 0; i < thread_count; i++) {
char thread_name[16];
MultiFDSendParams *p = &multifd_send_state->params[i];
@@ -467,6 +492,8 @@ int multifd_save_setup(void)
qemu_sem_init(&p->sem, 0);
p->quit = false;
p->id = i;
+ p->done = true;
+ p->address = 0;
p->c = socket_send_channel_create();
if (!p->c) {
error_report("Error creating a send channel");
@@ -481,6 +508,30 @@ int multifd_save_setup(void)
return 0;
}
+static uint16_t multifd_send_page(uint8_t *address, bool last_page)
+{
+ int i;
+ MultiFDSendParams *p = NULL; /* make happy gcc */
+
+ qemu_sem_wait(&multifd_send_state->sem);
+ qemu_mutex_lock(&multifd_send_state->mutex);
+ for (i = 0; i < multifd_send_state->count; i++) {
+ p = &multifd_send_state->params[i];
+
+ if (p->done) {
+ p->done = false;
+ break;
+ }
+ }
+ qemu_mutex_unlock(&multifd_send_state->mutex);
+ qemu_mutex_lock(&p->mutex);
+ p->address = address;
+ qemu_mutex_unlock(&p->mutex);
+ qemu_sem_post(&p->sem);
+
+ return 0;
+}
+
struct MultiFDRecvParams {
uint8_t id;
QemuThread thread;
@@ -1051,6 +1102,32 @@ static int ram_save_page(RAMState *rs, PageSearchStatus
*pss, bool last_stage)
return pages;
}
+static int ram_multifd_page(RAMState *rs, PageSearchStatus *pss,
+ bool last_stage)
+{
+ int pages;
+ uint8_t *p;
+ RAMBlock *block = pss->block;
+ ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
+
+ p = block->host + offset;
+
+ pages = save_zero_page(rs, block, offset, p);
+ if (pages == -1) {
+ ram_counters.transferred +=
+ save_page_header(rs, rs->f, block,
+ offset | RAM_SAVE_FLAG_MULTIFD_PAGE);
+ qemu_put_buffer(rs->f, p, TARGET_PAGE_SIZE);
+ multifd_send_page(p, rs->migration_dirty_pages == 1);
+ ram_counters.transferred += TARGET_PAGE_SIZE;
+ pages = 1;
+ ram_counters.normal++;
+ ram_counters.multifd++;
+ }
+
+ return pages;
+}
+
static int do_compress_ram_page(QEMUFile *f, RAMBlock *block,
ram_addr_t offset)
{
@@ -1479,6 +1556,8 @@ static int ram_save_target_page(RAMState *rs,
PageSearchStatus *pss,
if (migrate_use_compression() &&
(rs->ram_bulk_stage || !migrate_use_xbzrle())) {
res = ram_save_compressed_page(rs, pss, last_stage);
+ } else if (migrate_use_multifd()) {
+ res = ram_multifd_page(rs, pss, last_stage);
} else {
res = ram_save_page(rs, pss, last_stage);
}
@@ -2771,6 +2850,10 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
if (!migrate_use_compression()) {
invalid_flags |= RAM_SAVE_FLAG_COMPRESS_PAGE;
}
+
+ if (!migrate_use_multifd()) {
+ invalid_flags |= RAM_SAVE_FLAG_MULTIFD_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
@@ -2795,13 +2878,17 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
if (flags & invalid_flags & RAM_SAVE_FLAG_COMPRESS_PAGE) {
error_report("Received an unexpected compressed page");
}
+ if (flags & invalid_flags & RAM_SAVE_FLAG_MULTIFD_PAGE) {
+ error_report("Received an unexpected multifd page");
+ }
ret = -EINVAL;
break;
}
if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE |
- RAM_SAVE_FLAG_COMPRESS_PAGE | RAM_SAVE_FLAG_XBZRLE)) {
+ RAM_SAVE_FLAG_COMPRESS_PAGE | RAM_SAVE_FLAG_XBZRLE |
+ RAM_SAVE_FLAG_MULTIFD_PAGE)) {
RAMBlock *block = ram_block_from_stream(f, flags);
host = host_from_ram_block_offset(block, addr);
@@ -2889,6 +2976,11 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
break;
}
break;
+
+ case RAM_SAVE_FLAG_MULTIFD_PAGE:
+ qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
+ break;
+
case RAM_SAVE_FLAG_EOS:
/* normal exit */
break;
diff --git a/qapi-schema.json b/qapi-schema.json
index 2d4dbd3..bb1fe0a 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -617,6 +617,8 @@
# @page-size: The number of bytes per page for the various page-based
# statistics (since 2.10)
#
+# @multifd: number of pages sent with multifd (since 2.10)
+#
# Since: 0.14.0
##
{ 'struct': 'MigrationStats',
@@ -624,7 +626,8 @@
'duplicate': 'int', 'skipped': 'int', 'normal': 'int',
'normal-bytes': 'int', 'dirty-pages-rate' : 'int',
'mbps' : 'number', 'dirty-sync-count' : 'int',
- 'postcopy-requests' : 'int', 'page-size' : 'int' } }
+ 'postcopy-requests' : 'int', 'page-size' : 'int',
+ 'multifd' : 'int'} }
##
# @XBZRLECacheStats:
--
2.9.4
