[Qemu-devel] [PATCH v12 13/13] Add XBZRLE statistics

[Orit Wasserman]

Signed-off-by: Benoit Hudzia <address@hidden>
Signed-off-by: Petter Svard <address@hidden>
Signed-off-by: Aidan Shribman <address@hidden>
Signed-off-by: Orit Wasserman <address@hidden>
---
 arch_init.c      |   68 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 hmp.c            |   13 ++++++++++
 migration.c      |   12 +++++++++
 migration.h      |    9 +++++++
 qapi-schema.json |   27 +++++++++++++++++++--
 qmp-commands.hx  |   28 ++++++++++++++++++++++
 6 files changed, 153 insertions(+), 4 deletions(-)

diff --git a/arch_init.c b/arch_init.c
index 08fe040..fa2ba83 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -201,8 +201,66 @@ void xbzrle_cache_resize(int64_t new_size)
     }
 }
 
+/* accounting */
+typedef struct AccountingInfo {
+    uint64_t dup_pages;
+    uint64_t norm_pages;
+    uint64_t xbzrle_bytes;
+    uint64_t xbzrle_pages;
+    uint64_t xbzrle_cache_miss;
+    uint64_t iterations;
+    uint64_t xbzrle_overflows;
+} AccountingInfo;
+
+static AccountingInfo acct_info;
+
+static void acct_clear(void)
+{
+    memset(&acct_info, 0, sizeof(acct_info));
+}
+
+uint64_t dup_mig_bytes_transferred(void)
+{
+    return acct_info.dup_pages * TARGET_PAGE_SIZE;
+}
+
+uint64_t dup_mig_pages_transferred(void)
+{
+    return acct_info.dup_pages;
+}
+
+uint64_t norm_mig_bytes_transferred(void)
+{
+    return acct_info.norm_pages * TARGET_PAGE_SIZE;
+}
+
+uint64_t norm_mig_pages_transferred(void)
+{
+    return acct_info.norm_pages;
+}
+
+uint64_t xbzrle_mig_bytes_transferred(void)
+{
+    return acct_info.xbzrle_bytes;
+}
+
+uint64_t xbzrle_mig_pages_transferred(void)
+{
+    return acct_info.xbzrle_pages;
+}
+
+uint64_t xbzrle_mig_pages_cache_miss(void)
+{
+    return acct_info.xbzrle_cache_miss;
+}
+
+uint64_t xbzrle_mig_pages_overflow(void)
+{
+    return acct_info.xbzrle_overflows;
+}
+
 static void save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
-        int cont, int flag)
+                           int cont, int flag)
 {
         qemu_put_be64(f, offset | cont | flag);
         if (!cont) {
@@ -233,6 +291,7 @@ static int save_xbzrle_page(QEMUFile *f, uint8_t 
*current_data,
     if (stage == 1 || !cache_is_cached(XBZRLE.cache, current_addr)) {
         cache_insert(XBZRLE.cache, current_addr,
                      g_memdup(current_data, TARGET_PAGE_SIZE));
+        acct_info.xbzrle_cache_miss++;
         return -1;
     }
 
@@ -247,6 +306,7 @@ static int save_xbzrle_page(QEMUFile *f, uint8_t 
*current_data,
         return 0;
     } else if (encoded_len == -1) {
         DPRINTF("Overflow\n");
+        acct_info.xbzrle_overflows++;
         /* update data in the cache */
         memcpy(prev_cached_page, current_data, TARGET_PAGE_SIZE);
         return -1;
@@ -266,7 +326,9 @@ static int save_xbzrle_page(QEMUFile *f, uint8_t 
*current_data,
     qemu_put_byte(f, hdr.xh_flags);
     qemu_put_be16(f, hdr.xh_len);
     qemu_put_buffer(f, XBZRLE.encoded_buf, encoded_len);
+    acct_info.xbzrle_pages++;
     bytes_sent = encoded_len + sizeof(hdr);
+    acct_info.xbzrle_bytes += bytes_sent;
 
     return bytes_sent;
 }
@@ -300,6 +362,7 @@ static int ram_save_block(QEMUFile *f, int stage)
             p = memory_region_get_ram_ptr(mr) + offset;
 
             if (is_dup_page(p)) {
+                acct_info.dup_pages++;
                 save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_COMPRESS);
                 qemu_put_byte(f, *p);
                 bytes_sent = 1;
@@ -321,6 +384,7 @@ static int ram_save_block(QEMUFile *f, int stage)
                 save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
                 qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
                 bytes_sent = TARGET_PAGE_SIZE;
+                acct_info.norm_pages++;
             }
 
             /* if page is unmodified lets continue to the next */
@@ -457,6 +521,7 @@ int ram_save_live(QEMUFile *f, int stage, void *opaque)
                 return -1;
             }
             XBZRLE.encoded_buf = g_malloc0(TARGET_PAGE_SIZE);
+            acct_clear();
         }
 
         /* Make sure all dirty bits are set */
@@ -491,6 +556,7 @@ int ram_save_live(QEMUFile *f, int stage, void *opaque)
            bytes_sent -1 represent no more blocks*/
         if (bytes_sent > 0) {
             bytes_transferred += bytes_sent;
+            acct_info.iterations++;
         } else if (bytes_sent == -1) { /* no more blocks */
             break;
         }
diff --git a/hmp.c b/hmp.c
index 38f9067..13e032e 100644
--- a/hmp.c
+++ b/hmp.c
@@ -164,6 +164,19 @@ void hmp_info_migrate(Monitor *mon)
                        info->disk->total >> 10);
     }
 
+    if (info->has_cache) {
+        monitor_printf(mon, "cache size: %" PRIu64 " bytes\n",
+                       info->cache->cache_size);
+        monitor_printf(mon, "xbzrle transferred: %" PRIu64 " kbytes\n",
+                       info->cache->xbzrle_bytes >> 10);
+        monitor_printf(mon, "xbzrle pages: %" PRIu64 " pages\n",
+                       info->cache->xbzrle_pages);
+        monitor_printf(mon, "xbzrle cache miss: %" PRIu64 "\n",
+                       info->cache->xbzrle_cache_miss);
+        monitor_printf(mon, "xbzrle overflow : %" PRIu64 "\n",
+                       info->cache->xbzrle_overflow);
+    }
+
     qapi_free_MigrationInfo(info);
 }
 
diff --git a/migration.c b/migration.c
index 16d47c0..fe9556d 100644
--- a/migration.c
+++ b/migration.c
@@ -148,6 +148,8 @@ MigrationInfo *qmp_query_migrate(Error **errp)
         info->ram->transferred = ram_bytes_transferred();
         info->ram->remaining = ram_bytes_remaining();
         info->ram->total = ram_bytes_total();
+        info->ram->duplicate = dup_mig_pages_transferred();
+        info->ram->norm  = norm_mig_pages_transferred();
 
         if (blk_mig_active()) {
             info->has_disk = true;
@@ -156,6 +158,16 @@ MigrationInfo *qmp_query_migrate(Error **errp)
             info->disk->remaining = blk_mig_bytes_remaining();
             info->disk->total = blk_mig_bytes_total();
         }
+
+        if (migrate_use_xbzrle()) {
+            info->has_cache = true;
+            info->cache = g_malloc0(sizeof(*info->cache));
+            info->cache->cache_size = migrate_xbzrle_cache_size();
+            info->cache->xbzrle_bytes  = xbzrle_mig_bytes_transferred();
+            info->cache->xbzrle_pages  = xbzrle_mig_pages_transferred();
+            info->cache->xbzrle_cache_miss = xbzrle_mig_pages_cache_miss();
+            info->cache->xbzrle_overflow = xbzrle_mig_pages_overflow();
+        }
         break;
     case MIG_STATE_COMPLETED:
         info->has_status = true;
diff --git a/migration.h b/migration.h
index cc7b433..7443fe5 100644
--- a/migration.h
+++ b/migration.h
@@ -83,6 +83,15 @@ uint64_t ram_bytes_remaining(void);
 uint64_t ram_bytes_transferred(void);
 uint64_t ram_bytes_total(void);
 
+uint64_t dup_mig_bytes_transferred(void);
+uint64_t dup_mig_pages_transferred(void);
+uint64_t norm_mig_bytes_transferred(void);
+uint64_t norm_mig_pages_transferred(void);
+uint64_t xbzrle_mig_bytes_transferred(void);
+uint64_t xbzrle_mig_pages_transferred(void);
+uint64_t xbzrle_mig_pages_overflow(void);
+uint64_t xbzrle_mig_pages_cache_miss(void);
+
 int ram_save_live(QEMUFile *f, int stage, void *opaque);
 int ram_load(QEMUFile *f, void *opaque, int version_id);
 
diff --git a/qapi-schema.json b/qapi-schema.json
index ca12542..75eb62e 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -263,7 +263,28 @@
 # Since: 0.14.0.
 ##
 { 'type': 'MigrationStats',
-  'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int' } }
+  'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int', 
'duplicate': 'int', 'norm': 'int' } }
+
+##
+# @CacheStats
+#
+# Detailed XBZRLE migration cache statistics
+#
+# @cache_size: XBZRLE cache size
+#
+# @xbzrle_bytes: amount of bytes already transferred to the target VM
+#
+# @xbzrle_pages: amount of pages transferred to the target VM
+#
+# @xbzrle_cache_miss: numer of cache miss
+#
+# @xbzrle_overflow: number of overflows
+#
+# Since: 1.1
+##
+{ 'type': 'CacheStats',
+  'data': {'cache_size': 'int', 'xbzrle_bytes': 'int', 'xbzrle_pages': 'int',
+           'xbzrle_cache_miss': 'int', 'xbzrle_overflow': 'int' } }
 
 ##
 # @MigrationInfo
@@ -286,8 +307,8 @@
 ##
 { 'type': 'MigrationInfo',
   'data': {'*status': 'str', '*ram': 'MigrationStats',
-           '*disk': 'MigrationStats', '*params': ['MigrationCapabilityInfo']} }
-
+           '*disk': 'MigrationStats', '*params': ['MigrationCapabilityInfo'],
+           '*cache': 'CacheStats'} }
 ##
 # @query-migrate
 #
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 7a10d4f..008be78 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2098,6 +2098,13 @@ The main json-object contains the following:
          - "transferred": amount transferred (json-int)
          - "remaining": amount remaining (json-int)
          - "total": total (json-int)
+- "cache": only present if "status" and XBZRLE is active.
+  it is a json-object with the following XBZRLE information:
+         - "cache size": XBZRLE cache size
+        - "xbzrle_bytes": total XBZRLE bytes transferred
+        - "xbzrle_pages": number of XBZRLE compressed pages
+        - "cache_miss": number of cache misses
+        - "overflow": number of XBZRLE overflows
 
 Examples:
 
@@ -2149,6 +2156,27 @@ Examples:
       }
    }
 
+5. Migration is being performed and XBZRLE is active:
+
+-> { "execute": "query-migrate" }
+<- {
+      "return":{
+         "status":"active",
+         "ram":{
+            "total":1057024,
+            "remaining":1053304,
+            "transferred":3720
+         },
+         "cache":{
+           "size": 1024
+            "xbzrle_transferred":20971520,
+           "xbzrle_pages":2444343,
+           "xbzrle_cache_miss:2244,
+           "xbzrle_overflow":34434
+         }
+      }
+   }
+
 EQMP
 
     {
-- 
1.7.7.6