Patchwork [10/11] Add XBZRLE statistics

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Submitter Juan Quintela
Date July 24, 2012, 6:19 p.m.
Message ID <1343153964-25254-11-git-send-email-quintela@redhat.com>
Download mbox | patch
Permalink /patch/173032/
State New
Headers show

Comments

Juan Quintela - July 24, 2012, 6:19 p.m.
From: Orit Wasserman <owasserm@redhat.com>

Signed-off-by: Benoit Hudzia <benoit.hudzia@sap.com>
Signed-off-by: Petter Svard <petters@cs.umu.se>
Signed-off-by: Aidan Shribman <aidan.shribman@sap.com>
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 arch_init.c      |   28 ++++++++++++++++++++++++++++
 hmp.c            |   21 +++++++++++++++++++++
 migration.c      |   36 +++++++++++++++++++++++++++++-------
 migration.h      |    4 ++++
 qapi-schema.json |   27 +++++++++++++++++++++++++--
 qmp-commands.hx  |   33 ++++++++++++++++++++++++++++++++-
 6 files changed, 139 insertions(+), 10 deletions(-)

Patch

diff --git a/arch_init.c b/arch_init.c
index 12afc46..f89908f 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -209,7 +209,11 @@  int64_t xbzrle_cache_resize(int64_t new_size)
 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;
@@ -239,6 +243,26 @@  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)
 {
@@ -267,6 +291,7 @@  static int save_xbzrle_page(QEMUFile *f, uint8_t *current_data,
     if (!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;
     }

@@ -284,6 +309,7 @@  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;
@@ -301,7 +327,9 @@  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;
 }
diff --git a/hmp.c b/hmp.c
index e0f520d..c141f90 100644
--- a/hmp.c
+++ b/hmp.c
@@ -168,6 +168,27 @@  void hmp_info_migrate(Monitor *mon)
                        info->disk->total >> 10);
     }

+    if (info->has_xbzrle_cache) {
+        monitor_printf(mon, "cache size: %" PRIu64 " bytes\n",
+                       info->xbzrle_cache->cache_size);
+        if (info->xbzrle_cache->has_xbzrle_bytes) {
+            monitor_printf(mon, "xbzrle transferred: %" PRIu64 " kbytes\n",
+                           info->xbzrle_cache->xbzrle_bytes >> 10);
+        }
+        if (info->xbzrle_cache->has_xbzrle_pages) {
+            monitor_printf(mon, "xbzrle pages: %" PRIu64 " pages\n",
+                           info->xbzrle_cache->xbzrle_pages);
+        }
+        if (info->xbzrle_cache->has_xbzrle_cache_miss) {
+            monitor_printf(mon, "xbzrle cache miss: %" PRIu64 "\n",
+                           info->xbzrle_cache->xbzrle_cache_miss);
+        }
+        if (info->xbzrle_cache->has_xbzrle_overflow) {
+            monitor_printf(mon, "xbzrle overflow : %" PRIu64 "\n",
+                           info->xbzrle_cache->xbzrle_overflow);
+        }
+    }
+
     qapi_free_MigrationInfo(info);
 }

diff --git a/migration.c b/migration.c
index cae444c..4be047a 100644
--- a/migration.c
+++ b/migration.c
@@ -133,6 +133,24 @@  static void get_capabilities(MigrationState *s, MigrationInfo *info)
         info->capabilities->next = NULL;
     }
 }
+
+static void get_xbzrle_cache_stats(MigrationInfo *info)
+{
+    if (migrate_use_xbzrle()) {
+        info->has_xbzrle_cache = true;
+        info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
+        info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
+        info->xbzrle_cache->has_xbzrle_bytes = true;
+        info->xbzrle_cache->xbzrle_bytes = xbzrle_mig_bytes_transferred();
+        info->xbzrle_cache->has_xbzrle_pages = true;
+        info->xbzrle_cache->xbzrle_pages = xbzrle_mig_pages_transferred();
+        info->xbzrle_cache->has_xbzrle_cache_miss = true;
+        info->xbzrle_cache->xbzrle_cache_miss = xbzrle_mig_pages_cache_miss();
+        info->xbzrle_cache->has_xbzrle_overflow = true;
+        info->xbzrle_cache->xbzrle_overflow = xbzrle_mig_pages_overflow();
+    }
+}
+
 MigrationInfo *qmp_query_migrate(Error **errp)
 {
     MigrationInfo *info = g_malloc0(sizeof(*info));
@@ -142,6 +160,14 @@  MigrationInfo *qmp_query_migrate(Error **errp)
     case MIG_STATE_SETUP:
         /* no migration has ever happened; show enabled capabilities */
         get_capabilities(s, info);
+
+        /* display xbzrle cache size */
+        if (migrate_use_xbzrle()) {
+            info->has_xbzrle_cache = true;
+            info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
+            info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
+        }
+
         break;
     case MIG_STATE_ACTIVE:
         get_capabilities(s, info);
@@ -166,17 +192,13 @@  MigrationInfo *qmp_query_migrate(Error **errp)
             info->disk->remaining = blk_mig_bytes_remaining();
             info->disk->total = blk_mig_bytes_total();
         }
+
+        get_xbzrle_cache_stats(info);
         break;
     case MIG_STATE_COMPLETED:
         get_capabilities(s, info);

-        info->has_ram = true;
-        info->ram = g_malloc0(sizeof(*info->ram));
-        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->normal = norm_mig_pages_transferred();
+        get_xbzrle_cache_stats(info);

         info->has_status = true;
         info->status = g_strdup("completed");
diff --git a/migration.h b/migration.h
index e4a7cd7..a9852fc 100644
--- a/migration.h
+++ b/migration.h
@@ -91,6 +91,10 @@  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);

 /**
  * @migrate_add_blocker - prevent migration from proceeding
diff --git a/qapi-schema.json b/qapi-schema.json
index 8676c1d..a4528f9 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -273,6 +273,26 @@ 
 { 'type': 'MigrationStats',
   'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int' ,
            'total_time': 'int', '*duplicate': 'int', '*normal': 'int' } }
+##
+# @XBZRLECacheStats
+#
+# 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: number of cache miss
+#
+# @xbzrle_overflow: number of overflows
+#
+# Since: 1.2
+##
+{ 'type': 'XBZRLECacheStats',
+  'data': {'cache-size': 'int', '*xbzrle-bytes': 'int', '*xbzrle-pages': 'int',
+           '*xbzrle-cache-miss': 'int', '*xbzrle-overflow': 'int' } }

 ##
 # @MigrationInfo
@@ -295,13 +315,16 @@ 
 # @capabilities: #optional a list describing all the migration capabilities
 #                state (since 1.2)
 #
+# @xbzrle-cache: #optional @XBZRLECacheStats containing detailed XBZRLE
+#                migration statistics (since 1.2)
+#
 # Since: 0.14.0
 ##
 { 'type': 'MigrationInfo',
   'data': {'*status': 'str', '*ram': 'MigrationStats',
            '*disk': 'MigrationStats',
-           '*capabilities': ['MigrationCapabilityStatus']} }
-
+           '*capabilities': ['MigrationCapabilityStatus'],
+           '*xbzrle-cache': 'XBZRLECacheStats'} }
 ##
 # @query-migrate
 #
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 9a4bff0..3518e64 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2108,10 +2108,17 @@  The main json-object contains the following:
          - "total": total (json-int)
 - "capabilities": migration capabilities state
          - "xbzrle" : XBZRLE state (json-bool)
+- "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:

 1. Before the first migration
-
 -> { "execute": "query-migrate" }
 <- { "return": {
         "capabilities" :  [ { "capability" : "xbzrle", "state" : false } ]
@@ -2172,6 +2179,30 @@  Examples:
       }
    }

+6. Migration is being performed and XBZRLE is active:
+
+-> { "execute": "query-migrate" }
+<- {
+      "return":{
+         "status":"active",
+         "capabilities" : [ { "capability": "xbzrle", "state" : true } ],
+         "ram":{
+            "total":1057024,
+            "remaining":1053304,
+            "transferred":3720,
+            "duplicate": 10,
+            "normal" : 3333
+         },
+         "cache":{
+            "cache-size": 1024
+            "xbzrle-transferred":20971520,
+            "xbzrle-pages":2444343,
+            "xbzrle-cache-miss":2244,
+            "xbzrle-overflow":34434
+         }
+      }
+   }
+
 EQMP

     {