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Date: Tue, 8 Nov 2016 08:30:03 +0000
From: Noam Camus <noamca@...lanox.com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>
CC: "robh+dt@...nel.org" <robh+dt@...nel.org>,
"mark.rutland@....com" <mark.rutland@....com>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Vineet Gupta <Vineet.Gupta1@...opsys.com>
Subject: RE: [PATCH v2 3/3] clocksource: Add clockevent support to NPS400
driver
> From: Daniel Lezcano [mailto:daniel.lezcano@...aro.org]
> Sent: Tuesday, November 1, 2016 10:02 PM
...
>Assuming cpu0 and cpu1 are sibling, does
>taskset 0x1 time sleep 2 & taskset 0x2 time sleep 3
I will use 16,17 instead of 0,1
>give a correct result without a dmesg log ?
[root@....168.8.2 /]$ [root@....168.8.2 /]$ taskset 65536 time sleep 2 & taskset 131072 time sleep 3
real 0m 2.54s
user 0m 0.04s
sys 0m 0.14s
real 0m 3.47s
user 0m 0.00s
sys 0m 0.15s
[1]+ Done taskset 65536 time sleep 2
Seem OK to me.
> Can you give the content of the /proc/timer_list ?
[root@....168.8.2 /]$ cat /proc/timer_list
Timer List Version: v0.8
HRTIMER_MAX_CLOCK_BASES: 4
now at 2421277626774 nsecs
cpu: 0
clock 0:
.base: 9fccb540
.index: 0
.resolution: 1 nsecs
.get_time: ktime_get
.offset: 0 nsecs
active timers:
#0: <9fccb69c>, tick_sched_timer, S:01
# expires at 2421140000000-2421140000000 nsecs [in -137626774 to -137626774 nsecs]
clock 1:
.base: 9fccb560
.index: 1
.resolution: 1 nsecs
.get_time: ktime_get_real
.offset: 0 nsecs
active timers:
clock 2:
.base: 9fccb580
.index: 2
.resolution: 1 nsecs
.get_time: ktime_get_boottime
.offset: 0 nsecs
active timers:
clock 3:
.base: 9fccb5a0
.index: 3
.resolution: 1 nsecs
.get_time: ktime_get_clocktai
.offset: 0 nsecs
active timers:
.expires_next : 2421140000000 nsecs
.hres_active : 1
.nr_events : 615427
.nr_retries : 10052
.nr_hangs : 37
.max_hang_time : 682411010
.nohz_mode : 2
.last_tick : 0 nsecs
.tick_stopped : 0
.idle_jiffies : 0
.idle_calls : 0
.idle_sleeps : 0
.idle_entrytime : 2421131605769 nsecs
.idle_waketime : 0 nsecs
.idle_exittime : 0 nsecs
.idle_sleeptime : 1900903609165 nsecs
.iowait_sleeptime: 0 nsecs
.last_jiffies : 0
.next_timer : 0
.idle_expires : 0 nsecs
jiffies: 212114
cpu: 16
clock 0:
.base: 9fcd7540
.index: 0
.resolution: 1 nsecs
.get_time: ktime_get
.offset: 0 nsecs
active timers:
clock 1:
.base: 9fcd7560
.index: 1
.resolution: 1 nsecs
.get_time: ktime_get_real
.offset: 0 nsecs
active timers:
clock 2:
.base: 9fcd7580
.index: 2
.resolution: 1 nsecs
.get_time: ktime_get_boottime
.offset: 0 nsecs
active timers:
clock 3:
.base: 9fcd75a0
.index: 3
.resolution: 1 nsecs
.get_time: ktime_get_clocktai
.offset: 0 nsecs
active timers:
.expires_next : 9223372036854775807 nsecs
.hres_active : 1
.nr_events : 18
.nr_retries : 1
.nr_hangs : 0
.max_hang_time : 0
.nohz_mode : 2
.last_tick : 2410120000000 nsecs
.tick_stopped : 1
.idle_jiffies : 211017
.idle_calls : 27
.idle_sleeps : 27
.idle_entrytime : 2410189597725 nsecs
.idle_waketime : 2410189342725 nsecs
.idle_exittime : 2410110197721 nsecs
.idle_sleeptime : 2408852044732 nsecs
.iowait_sleeptime: 0 nsecs
.last_jiffies : 211019
.next_timer : 9223372036854775807
.idle_expires : 9223372036854775807 nsecs
jiffies: 212114
cpu: 17
clock 0:
.base: 9fce3540
.index: 0
.resolution: 1 nsecs
.get_time: ktime_get
.offset: 0 nsecs
active timers:
clock 1:
.base: 9fce3560
.index: 1
.resolution: 1 nsecs
.get_time: ktime_get_real
.offset: 0 nsecs
active timers:
clock 2:
.base: 9fce3580
.index: 2
.resolution: 1 nsecs
.get_time: ktime_get_boottime
.offset: 0 nsecs
active timers:
clock 3:
.base: 9fce35a0
.index: 3
.resolution: 1 nsecs
.get_time: ktime_get_clocktai
.offset: 0 nsecs
active timers:
.expires_next : 9223372036854775807 nsecs
.hres_active : 1
.nr_events : 22
.nr_retries : 1
.nr_hangs : 0
.max_hang_time : 0
.nohz_mode : 2
.last_tick : 2412120000000 nsecs
.tick_stopped : 1
.idle_jiffies : 211212
.idle_calls : 32
.idle_sleeps : 32
.idle_entrytime : 2412123353729 nsecs
.idle_waketime : 2412123049733 nsecs
.idle_exittime : 2412110161733 nsecs
.idle_sleeptime : 2410832354720 nsecs
.iowait_sleeptime: 0 nsecs
.last_jiffies : 211213
.next_timer : 9223372036854775807
.idle_expires : 9223372036854775807 nsecs
jiffies: 212114
Tick Device: mode: 1
Per CPU device: 0
Clock Event Device: ARC Timer0
max_delta_ns: 51539607733
min_delta_ns: 1000
mult: 178956970
shift: 31
mode: 3
next_event: 2421140000000 nsecs
set_next_event: arc_clkevent_set_next_event
periodic: arc_clkevent_set_periodic
event_handler: hrtimer_interrupt
retries: 0
Tick Device: mode: 1
Per CPU device: 16
Clock Event Device: ARC Timer0
max_delta_ns: 51539607733
min_delta_ns: 1000
mult: 178956970
shift: 31
mode: 3
next_event: 9223372036854775807 nsecs
set_next_event: arc_clkevent_set_next_event
periodic: arc_clkevent_set_periodic
event_handler: hrtimer_interrupt
retries: 2
Tick Device: mode: 1
Per CPU device: 17
Clock Event Device: ARC Timer0
max_delta_ns: 51539607733
min_delta_ns: 1000
mult: 178956970
shift: 31
mode: 3
next_event: 9223372036854775807 nsecs
set_next_event: arc_clkevent_set_next_event
periodic: arc_clkevent_set_periodic
event_handler: hrtimer_interrupt
retries: 2
-Noam
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