diff mbox series

[v6,1/3] stat64: Add stat64_set() operation

Message ID 20230427095250.22350-2-quintela@redhat.com
State New
Headers show
Series Migration: Make more ram_counters atomic | expand

Commit Message

Juan Quintela April 27, 2023, 9:52 a.m. UTC 
From: Paolo Bonzini <pbonzini@redhat.com>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 include/qemu/stats64.h |  6 ++++++
 util/stats64.c         | 11 +++++++++++
 2 files changed, 17 insertions(+)

Comments

Richard Henderson April 27, 2023, 10:08 a.m. UTC | #1 
On 4/27/23 10:52, Juan Quintela wrote:
> From: Paolo Bonzini<pbonzini@redhat.com>
> 
> Signed-off-by: Paolo Bonzini<pbonzini@redhat.com>
> Reviewed-by: Juan Quintela<quintela@redhat.com>
> Signed-off-by: Juan Quintela<quintela@redhat.com>
> ---
>   include/qemu/stats64.h |  6 ++++++
>   util/stats64.c         | 11 +++++++++++
>   2 files changed, 17 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~
diff mbox series

Patch

diff --git a/include/qemu/stats64.h b/include/qemu/stats64.h
index 802402254b..99b5cb724a 100644
--- a/include/qemu/stats64.h
+++ b/include/qemu/stats64.h
@@ -40,6 +40,11 @@  static inline uint64_t stat64_get(const Stat64 *s)
     return qatomic_read__nocheck(&s->value);
 }
 
+static inline void stat64_set(Stat64 *s, uint64_t value)
+{
+    qatomic_set__nocheck(&s->value, value);
+}
+
 static inline void stat64_add(Stat64 *s, uint64_t value)
 {
     qatomic_add(&s->value, value);
@@ -62,6 +67,7 @@  static inline void stat64_max(Stat64 *s, uint64_t value)
 }
 #else
 uint64_t stat64_get(const Stat64 *s);
+void stat64_set(Stat64 *s, uint64_t value);
 bool stat64_min_slow(Stat64 *s, uint64_t value);
 bool stat64_max_slow(Stat64 *s, uint64_t value);
 bool stat64_add32_carry(Stat64 *s, uint32_t low, uint32_t high);
diff --git a/util/stats64.c b/util/stats64.c
index 897613c949..09736014ec 100644
--- a/util/stats64.c
+++ b/util/stats64.c
@@ -57,6 +57,17 @@  uint64_t stat64_get(const Stat64 *s)
     return ((uint64_t)high << 32) | low;
 }
 
+void stat64_set(Stat64 *s, uint64_t val)
+{
+    while (!stat64_wrtrylock(s)) {
+        cpu_relax();
+    }
+
+    qatomic_set(&s->high, val >> 32);
+    qatomic_set(&s->low, val);
+    stat64_wrunlock(s);
+}
+
 bool stat64_add32_carry(Stat64 *s, uint32_t low, uint32_t high)
 {
     uint32_t old;