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xen-devel
Re: [Xen-devel] [PATCH] remove blocked time accounting from xen "clockch
On 10/20/11 16:35, Laszlo Ersek wrote:
I'm convinced the patch is correct, and only the commit message might
need a small fix (mentioning cpu_idle()).
I forgot to say that I also added counters to xen_timer_interrupt(),
account_idle_ticks() (called from cpu_idle()), and the idle time branch
of account_process_tick(). (The last one is reached from
xen_timer_interrupt() via event_handler == &tick_nohz_handler, after
highres=off was passed). When the VM was left alone, they were
increasing in strict lock-step.
account_idle_time()
<- account_idle_ticks()
<- tick_nohz_restart_sched_tick()
<- cpu_idle()
<- account_process_tick()
<- update_process_times()
<- tick_nohz_handler() [highres=off]
<- xen_timer_interrupt()
<- (tick_periodic())
<- (tick_sched_timer())
The timer interrupt appears to kick cpu_idle(), and the latter accounts
for the time spent idly.
Laszlo
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