qemu-kvm/kvm-migration-Create-migrate_cpu_throttle_tailslow-funct.patch

From b88c51c4b02639e28da73143b1da7bd3d6706ce5 Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Thu, 2 Mar 2023 10:29:51 +0100
Subject: [PATCH 46/56] migration: Create migrate_cpu_throttle_tailslow()
 function
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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: [45/50] e93e96392405c60f75abbf288e4fddb191bbc996 (peterx/qemu-kvm)

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
(cherry picked from commit 873f674c559e3162a6e6e92994301d400c5cc873)
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/options.c | 9 +++++++++
 migration/options.h | 1 +
 migration/ram.c     | 3 +--
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/migration/options.c b/migration/options.c
index 31435d2b45..615534c151 100644
--- a/migration/options.c
+++ b/migration/options.c
@@ -527,6 +527,15 @@ uint8_t migrate_cpu_throttle_initial(void)
     return s->parameters.cpu_throttle_initial;
 }
 
+bool migrate_cpu_throttle_tailslow(void)
+{
+    MigrationState *s;
+
+    s = migrate_get_current();
+
+    return s->parameters.cpu_throttle_tailslow;
+}
+
 int migrate_decompress_threads(void)
 {
     MigrationState *s;
diff --git a/migration/options.h b/migration/options.h
index 49b29bdafd..99f6bbd7a1 100644
--- a/migration/options.h
+++ b/migration/options.h
@@ -52,6 +52,7 @@ int migrate_compress_threads(void);
 int migrate_compress_wait_thread(void);
 uint8_t migrate_cpu_throttle_increment(void);
 uint8_t migrate_cpu_throttle_initial(void);
+bool migrate_cpu_throttle_tailslow(void);
 int migrate_decompress_threads(void);
 uint8_t migrate_max_cpu_throttle(void);
 int64_t migrate_max_postcopy_bandwidth(void);
diff --git a/migration/ram.c b/migration/ram.c
index 5645745a42..01356f60a4 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -711,10 +711,9 @@ static size_t save_page_header(PageSearchStatus *pss, QEMUFile *f,
 static void mig_throttle_guest_down(uint64_t bytes_dirty_period,
                                     uint64_t bytes_dirty_threshold)
 {
-    MigrationState *s = migrate_get_current();
     uint64_t pct_initial = migrate_cpu_throttle_initial();
     uint64_t pct_increment = migrate_cpu_throttle_increment();
-    bool pct_tailslow = s->parameters.cpu_throttle_tailslow;
+    bool pct_tailslow = migrate_cpu_throttle_tailslow();
     int pct_max = migrate_max_cpu_throttle();
 
     uint64_t throttle_now = cpu_throttle_get_percentage();
-- 
2.39.1