[PATCH 12/18] migration: Create compression_update_rates()

[Juan Quintela <quintela@redhat.com>]

So we can move more compression_counters stuff to ram-compress.c.
Create compression_counters struct to add the stuff that was on
MigrationState.

Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram-compress.h |  1 +
 migration/ram.h          |  1 -
 migration/ram-compress.c | 41 +++++++++++++++++++++++++++++++++++++++-
 migration/ram.c          | 29 +---------------------------
 4 files changed, 42 insertions(+), 30 deletions(-)

diff --git a/migration/ram-compress.h b/migration/ram-compress.h
index b228640092..a7eb028849 100644
--- a/migration/ram-compress.h
+++ b/migration/ram-compress.h
@@ -71,5 +71,6 @@ void decompress_data_with_multi_threads(QEMUFile *f, void *host, int len);
 void populate_compress(MigrationInfo *info);
 uint64_t ram_compressed_pages(void);
 void update_compress_thread_counts(const CompressParam *param, int bytes_xmit);
+void compression_update_rates(uint64_t page_count);
 
 #endif
diff --git a/migration/ram.h b/migration/ram.h
index ea1f3c25b5..60bc4c9e3a 100644
--- a/migration/ram.h
+++ b/migration/ram.h
@@ -34,7 +34,6 @@
 #include "io/channel.h"
 
 extern XBZRLECacheStats xbzrle_counters;
-extern CompressionStats compression_counters;
 
 bool ramblock_is_ignored(RAMBlock *block);
 /* Should be holding either ram_list.mutex, or the RCU lock. */
diff --git a/migration/ram-compress.c b/migration/ram-compress.c
index 2652cdee8b..5e1bb82fcd 100644
--- a/migration/ram-compress.c
+++ b/migration/ram-compress.c
@@ -41,7 +41,20 @@
 #include "ram.h"
 #include "migration-stats.h"
 
-CompressionStats compression_counters;
+static struct {
+    int64_t pages;
+    int64_t busy;
+    double busy_rate;
+    int64_t compressed_size;
+    double compression_rate;
+    /* compression statistics since the beginning of the period */
+    /* amount of count that no free thread to compress data */
+    uint64_t compress_thread_busy_prev;
+    /* amount bytes after compression */
+    uint64_t compressed_size_prev;
+    /* amount of compressed pages */
+    uint64_t compress_pages_prev;
+} compression_counters;
 
 static CompressParam *comp_param;
 static QemuThread *compress_threads;
@@ -529,3 +542,29 @@ void update_compress_thread_counts(const CompressParam *param, int bytes_xmit)
     compression_counters.pages++;
 }
 
+void compression_update_rates(uint64_t page_count)
+{
+    if (migrate_compress()) {
+        compression_counters.busy_rate = (double)(compression_counters.busy -
+            compression_counters.compress_thread_busy_prev) / page_count;
+        compression_counters.compress_thread_busy_prev =
+            compression_counters.busy;
+
+        double compressed_size = compression_counters.compressed_size -
+                                 compression_counters.compressed_size_prev;
+        if (compressed_size) {
+            double uncompressed_size = (compression_counters.pages -
+                compression_counters.compress_pages_prev) *
+                qemu_target_page_size();
+
+            /* Compression-Ratio = Uncompressed-size / Compressed-size */
+            compression_counters.compression_rate =
+                                        uncompressed_size / compressed_size;
+
+            compression_counters.compress_pages_prev =
+                compression_counters.pages;
+            compression_counters.compressed_size_prev =
+                compression_counters.compressed_size;
+        }
+    }
+}
diff --git a/migration/ram.c b/migration/ram.c
index 60f24006bc..1bd586c23a 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -364,13 +364,6 @@ struct RAMState {
     bool xbzrle_started;
     /* Are we on the last stage of migration */
     bool last_stage;
-    /* compression statistics since the beginning of the period */
-    /* amount of count that no free thread to compress data */
-    uint64_t compress_thread_busy_prev;
-    /* amount bytes after compression */
-    uint64_t compressed_size_prev;
-    /* amount of compressed pages */
-    uint64_t compress_pages_prev;
 
     /* total handled target pages at the beginning of period */
     uint64_t target_page_count_prev;
@@ -933,7 +926,6 @@ uint64_t ram_get_total_transferred_pages(void)
 static void migration_update_rates(RAMState *rs, int64_t end_time)
 {
     uint64_t page_count = rs->target_page_count - rs->target_page_count_prev;
-    double compressed_size;
 
     /* calculate period counters */
     stat64_set(&mig_stats.dirty_pages_rate,
@@ -961,26 +953,7 @@ static void migration_update_rates(RAMState *rs, int64_t end_time)
         rs->xbzrle_pages_prev = xbzrle_counters.pages;
         rs->xbzrle_bytes_prev = xbzrle_counters.bytes;
     }
-
-    if (migrate_compress()) {
-        compression_counters.busy_rate = (double)(compression_counters.busy -
-            rs->compress_thread_busy_prev) / page_count;
-        rs->compress_thread_busy_prev = compression_counters.busy;
-
-        compressed_size = compression_counters.compressed_size -
-                          rs->compressed_size_prev;
-        if (compressed_size) {
-            double uncompressed_size = (compression_counters.pages -
-                                    rs->compress_pages_prev) * TARGET_PAGE_SIZE;
-
-            /* Compression-Ratio = Uncompressed-size / Compressed-size */
-            compression_counters.compression_rate =
-                                        uncompressed_size / compressed_size;
-
-            rs->compress_pages_prev = compression_counters.pages;
-            rs->compressed_size_prev = compression_counters.compressed_size;
-        }
-    }
+    compression_update_rates(page_count);
 }
 
 static void migration_trigger_throttle(RAMState *rs)
-- 
2.40.1