qemu-kvm/kvm-migration-Rename-duplicate-to-zero_pages.patch

From 3cecf66655a0dd599666bcac8add2dee85d5651f Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Wed, 19 Apr 2023 18:16:05 +0200
Subject: [PATCH 16/56] migration: Rename duplicate to zero_pages
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RH-Author: Peter Xu <peterx@redhat.com>
RH-MergeRequest: 162: migration: Pretty failures for postcopy on unsupported memory types
RH-Bugzilla: 2057267
RH-Acked-by: Leonardo Brás <leobras@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: quintela1 <quintela@redhat.com>
RH-Commit: [15/50] 89db3c8b167c0f411ba95ce2730540c0e8f1206b (peterx/qemu-kvm)

Rest of counters that refer to pages has a _pages suffix.
And historically, this showed the number of pages composed of the same
character, here comes the name "duplicated".  But since years ago, it
refers to the number of zero_pages.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
(cherry picked from commit 1a386e8de5995fb5478ea99baa6d3e71abcf4b80)
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/migration.c |  2 +-
 migration/ram.c       | 10 +++++-----
 migration/ram.h       |  2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index 39501a0ed8..c15e2a61ca 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1142,7 +1142,7 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s)
     info->ram = g_malloc0(sizeof(*info->ram));
     info->ram->transferred = stat64_get(&ram_counters.transferred);
     info->ram->total = ram_bytes_total();
-    info->ram->duplicate = stat64_get(&ram_counters.duplicate);
+    info->ram->duplicate = stat64_get(&ram_counters.zero_pages);
     /* legacy value.  It is not used anymore */
     info->ram->skipped = 0;
     info->ram->normal = stat64_get(&ram_counters.normal);
diff --git a/migration/ram.c b/migration/ram.c
index fe69ecaef4..19d345a030 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1119,7 +1119,7 @@ uint64_t ram_pagesize_summary(void)
 uint64_t ram_get_total_transferred_pages(void)
 {
     return stat64_get(&ram_counters.normal) +
-        stat64_get(&ram_counters.duplicate) +
+        stat64_get(&ram_counters.zero_pages) +
         compression_counters.pages + xbzrle_counters.pages;
 }
 
@@ -1320,7 +1320,7 @@ static int save_zero_page(PageSearchStatus *pss, QEMUFile *f, RAMBlock *block,
     int len = save_zero_page_to_file(pss, f, block, offset);
 
     if (len) {
-        stat64_add(&ram_counters.duplicate, 1);
+        stat64_add(&ram_counters.zero_pages, 1);
         ram_transferred_add(len);
         return 1;
     }
@@ -1359,7 +1359,7 @@ static bool control_save_page(PageSearchStatus *pss, RAMBlock *block,
     if (bytes_xmit > 0) {
         stat64_add(&ram_counters.normal, 1);
     } else if (bytes_xmit == 0) {
-        stat64_add(&ram_counters.duplicate, 1);
+        stat64_add(&ram_counters.zero_pages, 1);
     }
 
     return true;
@@ -1486,7 +1486,7 @@ update_compress_thread_counts(const CompressParam *param, int bytes_xmit)
     ram_transferred_add(bytes_xmit);
 
     if (param->zero_page) {
-        stat64_add(&ram_counters.duplicate, 1);
+        stat64_add(&ram_counters.zero_pages, 1);
         return;
     }
 
@@ -2621,7 +2621,7 @@ void acct_update_position(QEMUFile *f, size_t size, bool zero)
     uint64_t pages = size / TARGET_PAGE_SIZE;
 
     if (zero) {
-        stat64_add(&ram_counters.duplicate, pages);
+        stat64_add(&ram_counters.zero_pages, pages);
     } else {
         stat64_add(&ram_counters.normal, pages);
         ram_transferred_add(size);
diff --git a/migration/ram.h b/migration/ram.h
index afa68521d7..55258334fe 100644
--- a/migration/ram.h
+++ b/migration/ram.h
@@ -45,7 +45,7 @@ typedef struct {
     Stat64 dirty_sync_count;
     Stat64 dirty_sync_missed_zero_copy;
     Stat64 downtime_bytes;
-    Stat64 duplicate;
+    Stat64 zero_pages;
     Stat64 multifd_bytes;
     Stat64 normal;
     Stat64 postcopy_bytes;
-- 
2.39.1