From d90f3cca87844ea797a1c96b88758478ac575e1f Mon Sep 17 00:00:00 2001 From: Cao jin Date: Fri, 29 Jul 2016 19:05:38 +0800 Subject: [PATCH] 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 Cc Peter Crosthwaite Cc: Richard Henderson Signed-off-by: Cao jin Message-Id: <1469790338-28990-4-git-send-email-caoj.fnst@cn.fujitsu.com> Signed-off-by: Paolo Bonzini --- cpus.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/cpus.c b/cpus.c index e11caf7ced..030843132f 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; -- 2.11.4.GIT