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cpus: update comments 

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 <pbonzini@redhat.com>
Cc  Peter Crosthwaite <crosthwaite.peter@gmail.com>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Message-Id: <1469790338-28990-4-git-send-email-caoj.fnst@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Cao jin 2016-07-29 19:05:38 +08:00 committed by Paolo Bonzini
parent 1d45cea549
commit d90f3cca87
1 changed files with 8 additions and 3 deletions
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cpus.c
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@ -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;