[Qemu-devel] [PULL 16/58] cpus: update comments

[Paolo Bonzini]

From: Cao jin <address@hidden>

The returned value of cpu_get_clock() is plused with the offset,
so it is the time elapsed in virtual machine when vm is active.

Cc: Paolo Bonzini <address@hidden>
Cc  Peter Crosthwaite <address@hidden>
Cc: Richard Henderson <address@hidden>
Signed-off-by: Cao jin <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
 cpus.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/cpus.c b/cpus.c
index e11caf7..0308431 100644
--- a/cpus.c
+++ b/cpus.c
@@ -191,8 +191,12 @@ int64_t cpu_icount_to_ns(int64_t icount)
     return icount << icount_time_shift;
 }
 
-/* return the host CPU cycle counter and handle stop/restart */
-/* Caller must hold the BQL */
+/* return the time elapsed in VM between vm_start and vm_stop.  Unless
+ * icount is active, cpu_get_ticks() uses units of the host CPU cycle
+ * counter.
+ *
+ * Caller must hold the BQL
+ */
 int64_t cpu_get_ticks(void)
 {
     int64_t ticks;
@@ -229,7 +233,8 @@ static int64_t cpu_get_clock_locked(void)
     return time;
 }
 
-/* return the host CPU monotonic timer and handle stop/restart */
+/* Return the monotonic time elapsed in VM, i.e.,
+ * the time between vm_start and vm_stop */
 int64_t cpu_get_clock(void)
 {
     int64_t ti;
-- 
1.8.3.1