diff options
author | Cao jin <caoj.fnst@cn.fujitsu.com> | 2016-07-29 19:05:38 +0800 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-13 19:08:44 +0200 |
commit | d90f3cca87844ea797a1c96b88758478ac575e1f (patch) | |
tree | fe80d6b45bc225aabc1dcbdf7f466df16eb43b97 | |
parent | 1d45cea5496fe509f0b66f01b876067e68a5faa0 (diff) |
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>
-rw-r--r-- | cpus.c | 11 |
1 files changed, 8 insertions, 3 deletions
@@ -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; |